Xfce desktop freezes after automated screen-lock (Manjaro 18.0.4 Illyria)

Hi,
yesterday i've installed Manjaro 18.0.4 Illyria XFCE-Edition. I've updated all stable updates. Than i've switched to the testing-branch, updated again.
After some idle time, the screen is locking itself (normal screen-lock). After unlocking it with my password, the desktop was frozen. No keyboard or mouse was working. (I could move the mouse pointer, but with no effect.) There was some keyboard error message (i've forgotten which..)-: ) in the right upper corner. Even replugging the keyboard or the mouse has no effect.
After a reboot, during booting, the last picture of the frozen desktop was visible. Than i've got a normal manjaro desktop. Until the screen lock locks again (-;

This bug is reproducable. (just wait for e.g. 10 minutes)

Manually locking the screen instead: here the unlocking process is ok.

screenfetch

OS: Manjaro 18.0.4 Illyria
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Kernel: x86_64 Linux 5.0.8-2-MANJARO
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Uptime: 5m
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Packages: 1263
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Shell: bash 5.0.3
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Resolution: 1920x1080
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ DE: Xfce4
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ WM: Xfwm4
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ WM Theme: Adapta-Maia
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ GTK Theme: Adapta-Eta-Maia [GTK2]
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Icon Theme: Papirus-Maia
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Font: Noto Sans 10
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ CPU: Intel Pentium 4 3.60GHz @ 2x 2.81GHz
GPU: NVA3
RAM: 934MiB / 2999MiB

inxi -Fxzc0
System:    Host:  Kernel: 5.0.8-2-MANJARO x86_64 bits: 64 compiler: gcc v: 8.2.1 Desktop: Xfce 4.13.3git-UNKNOWN 
           Distro: Manjaro Linux 
Machine:   Type: Desktop Mobo: ASUSTeK model: P5WD2-Premium v: Rev 1.xx serial: <filter> BIOS: American Megatrends v: 0422 
           date: 05/27/2005 
CPU:       Topology: Single Core model: Intel Pentium 4 bits: 64 type: MT arch: Netburst Smithfield rev: 3 L2 cache: 2048 KiB 
           flags: lm nx pae sse sse2 sse3 bogomips: 11244 
           Speed: 2810 MHz min/max: N/A Core speeds (MHz): 1: 2810 2: 2810 
Graphics:  Device-1: NVIDIA GT215 [GeForce GT 240] driver: nouveau v: kernel bus ID: 08:00.0 
           Display: x11 server: X.Org 1.20.4 driver: nouveau unloaded: modesetting resolution: 1920x1080~60Hz 
           OpenGL: renderer: NVA3 v: 3.3 Mesa 19.0.2 direct render: Yes 
Audio:     Device-1: Intel NM10/ICH7 Family High Definition Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel 
           bus ID: 00:1b.0 
           Device-2: NVIDIA High Definition Audio driver: snd_hda_intel v: kernel bus ID: 08:00.1 
           Sound Server: ALSA v: k5.0.8-2-MANJARO 
Network:   Device-1: Marvell 88E8001 Gigabit Ethernet vendor: ASUSTeK driver: skge v: 1.14 port: 7800 bus ID: 01:05.0 
           IF: enp1s5 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Intel 82573V Gigabit Ethernet vendor: ASUSTeK driver: e1000e v: 3.2.6-k port: 9800 bus ID: 03:00.0 
           IF: enp3s0 state: down mac: <filter> 
Drives:    Local Storage: total: 298.09 GiB used: 10.13 GiB (3.4%) 
           ID-1: /dev/sda vendor: Western Digital model: WD3200BPVT-24JJ5T0 size: 298.09 GiB 
Partition: ID-1: / size: 286.06 GiB used: 10.13 GiB (3.5%) fs: ext4 dev: /dev/sda1 
           ID-2: swap-1 size: 6.45 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda2 
Sensors:   Message: No sensors data was found. Is sensors configured? 
Info:      Processes: 153 Uptime: 18m Memory: 2.93 GiB used: 988.0 MiB (32.9%) Init: systemd Compilers: gcc: 8.2.1 Shell: bash 
           v: 5.0.3 inxi: 3.0.33 

so far:

systemd-coredump[1251]: Process 1060 (pamac-manager) of user 1000 dumped core.
lightdm[16857]: gkr-pam: unable to locate daemon control file

journalctl -p 3
Apr 23 21:51:22  kernel: nouveau 0000:08:00.0: bios: OOB 1 d7500086 d7500086
Apr 23 22:02:48  systemd-coredump[1251]: Process 1060 (pamac-manager) of user 1000 dumped core.
                                                
                                                Stack trace of thread 1249:
                                                #0  0x00007f895a532ad2 alpm_list_join (libalpm.so.11)
                                                #1  0x00007f895a547f98 n/a (libalpm.so.11)
                                                #2  0x00007f895a538d49 n/a (libalpm.so.11)
                                                #3  0x00007f895a53c2b4 n/a (libalpm.so.11)
                                                #4  0x00007f895a53c94e n/a (libalpm.so.11)
                                                #5  0x00007f895a53c99e alpm_db_get_pkg (libalpm.so.11)
                                                #6  0x00007f895b3540fd n/a (libpamac.so)
                                                #7  0x00007f895b359dd0 n/a (libpamac.so)
                                                #8  0x00007f895a84a273 g_ptr_array_foreach (libglib-2.0.so.0)
                                                #9  0x00007f895b354ddb n/a (libpamac.so)
                                                #10 0x00007f895a84a273 g_ptr_array_foreach (libglib-2.0.so.0)
                                                #11 0x00007f895b35ccc0 pamac_database_get_category_pkgs (libpamac.so)
                                                #12 0x00007f895b35cd37 n/a (libpamac.so)
                                                #13 0x00007f895a7fec21 n/a (libglib-2.0.so.0)
                                                #14 0x00007f895979aa9d start_thread (libpthread.so.0)
                                                #15 0x00007f895a65daf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1245:
                                                #0  0x00007f895a5f2ec2 __strcmp_sse2 (libc.so.6)
                                                #1  0x00007f895a59302b transcmp (libc.so.6)
                                                #2  0x00007f895a659c1b __tfind (libc.so.6)
                                                #3  0x00007f895a593ec7 __dcigettext (libc.so.6)
                                                #4  0x00007f895a53ca12 alpm_db_get_pkg (libalpm.so.11)
                                                #5  0x00007f895b359ac7 n/a (libpamac.so)
                                                #6  0x00007f895a84a273 g_ptr_array_foreach (libglib-2.0.so.0)
                                                #7  0x00007f895b35c04a pamac_database_get_installed_apps (libpamac.so)
                                                #8  0x00007f895b35c0e3 n/a (libpamac.so)
                                                #9  0x00007f895a7fec21 n/a (libglib-2.0.so.0)
                                                #10 0x00007f895979aa9d start_thread (libpthread.so.0)
                                                #11 0x00007f895a65daf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 892:
                                                #0  0x00007fcd95337d7f raise (libc.so.6)
                                                #1  0x00007fcd95322672 abort (libc.so.6)
                                                #2  0x00007fcd9537a878 __libc_message (libc.so.6)
                                                #3  0x00007fcd9538118a malloc_printerr (libc.so.6)
                                                #4  0x00007fcd9538297c _int_free (libc.so.6)
                                                #5  0x00007fcd95771def n/a (libcups.so.2)
                                                #6  0x00007fcd95771d58 ippDelete (libcups.so.2)
                                                #7  0x000055af33b71745 n/a (/usr/bin/cupsd)
Apr 23 21:26:46  hp[13767]: io/hpmud/pp.c 627: unable to read device-id ret=-1
Apr 23 21:26:47  python[13761]: io/hpmud/pp.c 627: unable to read device-id ret=-1
Apr 23 21:42:30  lightdm[14577]: gkr-pam: unable to locate daemon control file
Apr 23 21:49:17  kernel: watchdog: watchdog0: watchdog did not stop!


Apr 23 21:51:22  kernel: nouveau 0000:08:00.0: bios: OOB 1 d7500086 d7500086
Apr 23 22:02:48  systemd-coredump[1251]: Process 1060 (pamac-manager) of user 1000 dumped core.
                                                
                                                Stack trace of thread 1249:
                                                #0  0x00007f895a532ad2 alpm_list_join (libalpm.so.11)
                                                #1  0x00007f895a547f98 n/a (libalpm.so.11)
                                                #2  0x00007f895a538d49 n/a (libalpm.so.11)
                                                #3  0x00007f895a53c2b4 n/a (libalpm.so.11)
                                                #4  0x00007f895a53c94e n/a (libalpm.so.11)
                                                #5  0x00007f895a53c99e alpm_db_get_pkg (libalpm.so.11)
                                                #6  0x00007f895b3540fd n/a (libpamac.so)
                                                #7  0x00007f895b359dd0 n/a (libpamac.so)
                                                #8  0x00007f895a84a273 g_ptr_array_foreach (libglib-2.0.so.0)
                                                #9  0x00007f895b354ddb n/a (libpamac.so)
                                                #10 0x00007f895a84a273 g_ptr_array_foreach (libglib-2.0.so.0)
                                                #11 0x00007f895b35ccc0 pamac_database_get_category_pkgs (libpamac.so)
                                                #12 0x00007f895b35cd37 n/a (libpamac.so)
                                                #13 0x00007f895a7fec21 n/a (libglib-2.0.so.0)
                                                #14 0x00007f895979aa9d start_thread (libpthread.so.0)
                                                #15 0x00007f895a65daf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1245:
                                                #0  0x00007f895a5f2ec2 __strcmp_sse2 (libc.so.6)
                                                #1  0x00007f895a59302b transcmp (libc.so.6)
                                                #2  0x00007f895a659c1b __tfind (libc.so.6)
                                                #3  0x00007f895a593ec7 __dcigettext (libc.so.6)
                                                #4  0x00007f895a53ca12 alpm_db_get_pkg (libalpm.so.11)
                                                #5  0x00007f895b359ac7 n/a (libpamac.so)
                                                #6  0x00007f895a84a273 g_ptr_array_foreach (libglib-2.0.so.0)
                                                #7  0x00007f895b35c04a pamac_database_get_installed_apps (libpamac.so)
                                                #8  0x00007f895b35c0e3 n/a (libpamac.so)
                                                #9  0x00007f895a7fec21 n/a (libglib-2.0.so.0)
                                                #10 0x00007f895979aa9d start_thread (libpthread.so.0)
                                                #11 0x00007f895a65daf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1061:
                                                #0  0x00007f895a652bf1 __poll (libc.so.6)
                                                #1  0x00007f895a823690 n/a (libglib-2.0.so.0)
                                                #2  0x00007f895a82377e g_main_context_iteration (libglib-2.0.so.0)
                                                #3  0x00007f895a8237d2 n/a (libglib-2.0.so.0)
                                                #4  0x00007f895a7fec21 n/a (libglib-2.0.so.0)
                                                #5  0x00007f895979aa9d start_thread (libpthread.so.0)
                                                #6  0x00007f895a65daf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1062:
                                                #0  0x00007f895a652bf1 __poll (libc.so.6)
                                                #1  0x00007f895a823690 n/a (libglib-2.0.so.0)
                                                #2  0x00007f895a8246d2 g_main_loop_run (libglib-2.0.so.0)
                                                #3  0x00007f895a997568 n/a (libgio-2.0.so.0)
                                                #4  0x00007f895a7fec21 n/a (libglib-2.0.so.0)
                                                #5  0x00007f895979aa9d start_thread (libpthread.so.0)
                                                #6  0x00007f895a65daf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1060:
                                                #0  0x00007f895a6548ff writev (libc.so.6)
                                                #1  0x00007f8958206916 n/a (libxcb.so.1)
                                                #2  0x00007f8958206d21 n/a (libxcb.so.1)
                                                #3  0x00007f8958206dae xcb_writev (libxcb.so.1)
                                                #4  0x00007f895a2e8d3f _XSend (libX11.so.6)
                                                #5  0x00007f895a2e8e4a _XEventsQueued (libX11.so.6)
                                                #6  0x00007f895a2da998 XPending (libX11.so.6)
                                                #7  0x00007f895ab87c2e n/a (libgdk-3.so.0)
                                                #8  0x00007f895ab50ea2 gdk_display_get_event (libgdk-3.so.0)
                                                #9  0x00007f895ab87aa4 n/a (libgdk-3.so.0)
                                                #10 0x00007f895a8217bf g_main_context_dispatch (libglib-2.0.so.0)
                                                #11 0x00007f895a823739 n/a (libglib-2.0.so.0)
                                                #12 0x00007f895a82377e g_main_context_iteration (libglib-2.0.so.0)
                                                #13 0x00007f895a9dbf5e g_application_run (libgio-2.0.so.0)
                                                #14 0x000055733a11cfbc n/a (pamac-manager)
                                                #15 0x00007f895a586223 __libc_start_main (libc.so.6)
                                                #16 0x000055733a10207e n/a (pamac-manager)
-- Reboot --
Apr 24 10:01:02  kernel: ACPI Error: Method parse/execution failed \_PR.CPU1._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 10:01:02  kernel: ACPI Error: Method parse/execution failed \_PR.CPU2._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 10:01:08  kernel: nouveau 0000:08:00.0: bios: OOB 1 d7500086 d7500086
Apr 24 10:01:40  colord-sane[710]: io/hpmud/pp.c 627: unable to read device-id ret=-1
Apr 24 12:18:05  lightdm[16857]: gkr-pam: unable to locate daemon control file
Apr 24 12:18:44  lightdm[17024]: gkr-pam: unable to locate daemon control file
Apr 24 12:19:25  colord-sane[17070]: io/hpmud/pp.c 627: unable to read device-id ret=-1
Apr 24 12:19:36  colord-sane[17141]: io/hpmud/pp.c 627: unable to read device-id ret=-1
-- Reboot --
Apr 24 12:20:39  kernel: ACPI Error: Method parse/execution failed \_PR.CPU1._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 12:20:39  kernel: ACPI Error: Method parse/execution failed \_PR.CPU2._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 12:20:45  kernel: nouveau 0000:08:00.0: bios: OOB 1 d7500086 d7500086
Apr 24 12:21:13  colord-sane[511]: io/hpmud/pp.c 627: unable to read device-id ret=-1


-- Reboot --
Apr 24 21:50:49  kernel: ACPI Error: Method parse/execution failed \_PR.CPU1._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 21:50:49  kernel: ACPI Error: Method parse/execution failed \_PR.CPU2._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 21:50:55  kernel: nouveau 0000:08:00.0: bios: OOB 1 d7500086 d7500086
Apr 24 21:51:21  colord-sane[457]: io/hpmud/pp.c 627: unable to read device-id ret=-1
Apr 24 22:36:29  lightdm[1428]: gkr-pam: unable to locate daemon control file
Apr 24 22:36:38  lightdm[1500]: gkr-pam: unable to locate daemon control file
Apr 24 22:38:11  systemd-coredump[1713]: Process 1632 (light-locker) of  1000 dumped core.
                                                
                                                Stack trace of thread 1632:
                                                #0  0x00007f2e15e8d186 n/a (libglib-2.0.so.0)
                                                #1  0x00007f2e15e81b3f g_log_default_handler (libglib-2.0.so.0)
                                                #2  0x00007f2e15e8d3c1 g_logv (libglib-2.0.so.0)
                                                #3  0x00007f2e15e8d5e0 g_log (libglib-2.0.so.0)
                                                #4  0x0000562c8001acb4 n/a (light-locker)
                                                #5  0x00007f2e15f68722 g_type_create_instance (libgobject-2.0.so.0)
                                                #6  0x00007f2e15f86509 n/a (libgobject-2.0.so.0)
                                                #7  0x00007f2e15f87a0d g_object_new_with_properties (libgobject-2.0.so.0)
                                                #8  0x00007f2e15f87b1a g_object_new (libgobject-2.0.so.0)
                                                #9  0x0000562c8001d4f3 gs_listener_new (light-locker)
                                                #10 0x0000562c80019484 n/a (light-locker)
                                                #11 0x00007f2e15f68722 g_type_create_instance (libgobject-2.0.so.0)
                                                #12 0x00007f2e15f86509 n/a (libgobject-2.0.so.0)
                                                #13 0x00007f2e15f87a0d g_object_new_with_properties (libgobject-2.0.so.0)
                                                #14 0x00007f2e15f87b1a g_object_new (libgobject-2.0.so.0)
                                                #15 0x0000562c80019b03 gs_monitor_new (light-locker)
                                                #16 0x0000562c80018339 main (light-locker)
                                                #17 0x00007f2e159c5223 __libc_start_main (libc.so.6)
                                                #18 0x0000562c8001848e _start (light-locker)
                                                
                                                Stack trace of thread 1661:
                                                #0  0x00007f2e15a91bf1 __poll (libc.so.6)
                                                #1  0x00007f2e15e95690 n/a (libglib-2.0.so.0)
                                                #2  0x00007f2e15e966d2 g_main_loop_run (libglib-2.0.so.0)
                                                #3  0x00007f2e16281568 n/a (libgio-2.0.so.0)
                                                #4  0x00007f2e15e70c21 n/a (libglib-2.0.so.0)
                                                #5  0x00007f2e14fa9a9d start_thread (libpthread.so.0)
                                                #6  0x00007f2e15a9caf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1662:
                                                #0  0x00007f2e15a91bf1 __poll (libc.so.6)
                                                #1  0x00007f2e15e95690 n/a (libglib-2.0.so.0)
                                                #2  0x00007f2e15e9577e g_main_context_iteration (libglib-2.0.so.0)
                                                #3  0x00007f2e16ebfbde n/a (libdconfsettings.so)
                                                #4  0x00007f2e15e70c21 n/a (libglib-2.0.so.0)
                                                #5  0x00007f2e14fa9a9d start_thread (libpthread.so.0)
                                                #6  0x00007f2e15a9caf3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1660:
                                                #0  0x00007f2e15a91bf1 __poll (libc.so.6)
                                                #1  0x00007f2e15e95690 n/a (libglib-2.0.so.0)
                                                #2  0x00007f2e15e9577e g_main_context_iteration (libglib-2.0.so.0)
                                                #3  0x00007f2e15e957d2 n/a (libglib-2.0.so.0)
                                                #4  0x00007f2e15e70c21 n/a (libglib-2.0.so.0)
                                                #5  0x00007f2e14fa9a9d start_thread (libpthread.so.0)
                                                #6  0x00007f2e15a9caf3 __clone (libc.so.6)
Apr 24 22:40:14  sudo[1830]: pam_unix(sudo:auth): conversation failed
Apr 24 22:40:14  sudo[1830]: pam_unix(sudo:auth): auth could not identify password for [...]
Apr 24 22:40:15  sudo[1833]: pam_unix(sudo:auth): conversation failed
Apr 24 22:40:15  sudo[1833]: pam_unix(sudo:auth): auth could not identify password for [...]
Apr 24 22:40:17  sudo[1834]: pam_unix(sudo:auth): conversation failed
Apr 24 22:40:17  sudo[1834]: pam_unix(sudo:auth): auth could not identify password for [...]
Apr 24 22:40:18  sudo[1835]: pam_unix(sudo:auth): conversation failed
Apr 24 22:40:18  sudo[1835]: pam_unix(sudo:auth): auth could not identify password for [...]
Apr 24 22:40:22  sudo[1858]: pam_unix(sudo:auth): conversation failed
Apr 24 22:40:22  sudo[1858]: pam_unix(sudo:auth): auth could not identify password for [...]
Apr 24 22:40:24  sudo[1859]: pam_unix(sudo:auth): conversation failed
Apr 24 22:40:24  sudo[1859]: pam_unix(sudo:auth): auth could not identify password for [...]
Apr 24 22:46:47  login[1516]: pam_systemd(login:session): Failed to release session: Interrupted system call

The only thing the keyboard is working: i can switch with strg+alt+F2 to another terminal.
There a new journalctl entry was visible.

lightdm[1726]: gkr-pam: unable to locate daemon control file
login[1804]: pam_tally2(login:auth): pam_get_uid; no such user
systemd-coredump[2004]: Process 1924 (light-locker) of user 1000 dumped core.

journalctl
Apr 24 12:20:39  kernel: ACPI Error: Method parse/execution failed \_PR.CPU1._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 12:20:39  kernel: ACPI Error: Method parse/execution failed \_PR.CPU2._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 24 12:20:45  kernel: nouveau 0000:08:00.0: bios: OOB 1 d7500086 d7500086
Apr 24 12:21:13  colord-sane[511]: io/hpmud/pp.c 627: unable to read device-id ret=-1
Apr 24 12:59:08  lightdm[1726]: gkr-pam: unable to locate daemon control file
Apr 24 12:59:57  login[1804]: pam_tally2(login:auth): pam_get_uid; no such user
Apr 24 13:00:54  systemd-coredump[2004]: Process 1924 (light-locker) of user 1000 dumped core.
                                                
                                                Stack trace of thread 1924:
                                                #0  0x00007fa8ca936186 n/a (libglib-2.0.so.0)
                                                #1  0x00007fa8ca92ab3f g_log_default_handler (libglib-2.0.so.0)
                                                #2  0x00007fa8ca9363c1 g_logv (libglib-2.0.so.0)
                                                #3  0x00007fa8ca9365e0 g_log (libglib-2.0.so.0)
                                                #4  0x000055c8d5e98cb4 n/a (light-locker)
                                                #5  0x00007fa8caa11722 g_type_create_instance (libgobject-2.0.so.0)
                                                #6  0x00007fa8caa2f509 n/a (libgobject-2.0.so.0)
                                                #7  0x00007fa8caa30a0d g_object_new_with_properties (libgobject-2.0.so.0)
                                                #8  0x00007fa8caa30b1a g_object_new (libgobject-2.0.so.0)
                                                #9  0x000055c8d5e9b4f3 gs_listener_new (light-locker)
                                                #10 0x000055c8d5e97484 n/a (light-locker)
                                                #11 0x00007fa8caa11722 g_type_create_instance (libgobject-2.0.so.0)
                                                #12 0x00007fa8caa2f509 n/a (libgobject-2.0.so.0)
                                                #13 0x00007fa8caa30a0d g_object_new_with_properties (libgobject-2.0.so.0)
                                                #14 0x00007fa8caa30b1a g_object_new (libgobject-2.0.so.0)
                                                #15 0x000055c8d5e97b03 gs_monitor_new (light-locker)
                                                #16 0x000055c8d5e96339 main (light-locker)
                                                #17 0x00007fa8ca46e223 __libc_start_main (libc.so.6)
                                                #18 0x000055c8d5e9648e _start (light-locker)
                                                
                                                Stack trace of thread 1954:
                                                #0  0x00007fa8ca53abf1 __poll (libc.so.6)
                                                #1  0x00007fa8ca93e690 n/a (libglib-2.0.so.0)
                                                #2  0x00007fa8ca93e77e g_main_context_iteration (libglib-2.0.so.0)
                                                #3  0x00007fa8ca93e7d2 n/a (libglib-2.0.so.0)
                                                #4  0x00007fa8ca919c21 n/a (libglib-2.0.so.0)
                                                #5  0x00007fa8c9a52a9d start_thread (libpthread.so.0)
                                                #6  0x00007fa8ca545af3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1955:
                                                #0  0x00007fa8ca53abf1 __poll (libc.so.6)
                                                #1  0x00007fa8ca93e690 n/a (libglib-2.0.so.0)
                                                #2  0x00007fa8ca93f6d2 g_main_loop_run (libglib-2.0.so.0)
                                                #3  0x00007fa8cad2a568 n/a (libgio-2.0.so.0)
                                                #4  0x00007fa8ca919c21 n/a (libglib-2.0.so.0)
                                                #5  0x00007fa8c9a52a9d start_thread (libpthread.so.0)
                                                #6  0x00007fa8ca545af3 __clone (libc.so.6)
                                                
                                                Stack trace of thread 1958:
                                                #0  0x00007fa8ca53abf1 __poll (libc.so.6)
                                                #1  0x00007fa8ca93e690 n/a (libglib-2.0.so.0)
                                                #2  0x00007fa8ca93e77e g_main_context_iteration (libglib-2.0.so.0)
                                                #3  0x00007fa8cb968bde n/a (libdconfsettings.so)
                                                #4  0x00007fa8ca919c21 n/a (libglib-2.0.so.0)
                                                #5  0x00007fa8c9a52a9d start_thread (libpthread.so.0)
                                                #6  0x00007fa8ca545af3 __clone (libc.so.6)
-- Subject: Speicherabbild fΓΌr Prozess 1924 (@COREDUMP_COMM) generiert
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Documentation: man:core(5)
-- 
-- Prozess 1924 (light-locker) ist abgebrochen worden und
-- ein Speicherabbild wurde generiert.
-- 
-- Üblicherweise ist dies ein Hinweis auf einen Programmfehler und sollte
-- als Fehler dem jeweiligen Hersteller gemeldet werden.

I try to disable light-locker with de-selectong screen-lock at the menu automated-starting-software:

I have filed a bug at
https://bugzilla.xfce.org/show_bug.cgi?id=15325

Hmm. inxi says Xfce 4.13.3git-UNKNOWN
4.13 is a development version, but what is git-UNKNOWN ? some nightly build?

I got response from XFCE Developers:

In reply to Linuxfreak from comment #0)

No keyboard or mouse was working. (I could move the mouse pointer, but with
no effect.)
Could be that the screen lock left the pointer and keyboard grabbed, which
would prevent any user interaction.
That seems suspicious to me:
systemd-coredump[2004]: Process 1924 (light-locker) of user 1000 dumped core.
But light-locker is not an xfce component.

@jonathon Is light-locker Manjaro stuff?

A new behavior: I've disabled the password (light-locker) with the screenshot above.

So after some time the screensaver of the monitor got active and went black. When it comes again (pressing a key or mouse movement..), the screen activates itself and the frozen desktop is also here.

this time, no new journalctl errors...

journalctl
Apr 25 08:58:39  kernel: ACPI Error: Method parse/execution failed \_PR.CPU1._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 25 08:58:39  kernel: ACPI Error: Method parse/execution failed \_PR.CPU2._PDC, AE_INVALID_TABLE_LENGTH (20181213/psparse-531)
Apr 25 08:58:45  kernel: nouveau 0000:08:00.0: bios: OOB 1 d7500086 d7500086
Apr 25 08:59:23  colord-sane[457]: io/hpmud/pp.c 627: unable to read device-id ret=-1

It seems to me that there are 2 bugs here? One light-locker and one screensaver wake-up?

$ pacman -Si light-locker
Repository      : community
Name            : light-locker
Version         : 1.8.0-2
Description     : A simple session locker for LightDM
Architecture    : x86_64
URL             : https://github.com/the-cavalry/light-locker
Licenses        : GPL2
Groups          : None
Provides        : None
Depends On      : dbus-glib  gtk3  libxxf86misc  lightdm  libxss
Optional Deps   : None
Conflicts With  : None
Replaces        : None
Download Size   : 73.73 KiB
Installed Size  : 276.00 KiB
Packager        : Evangelos Foutras <evangelos@foutrelis.com>
Build Date      : Sat 10 Nov 2018 00:37:32 GMT
Validated By    : MD5 Sum  SHA-256 Sum  Signature

Nope.

1 Like

Thanx Jonathan,

filed a bug also here.

1 Like

xfwm4-tweaks-settings β†’ Compositor β†’ Un-check "Enable display compositing"

This helped. Now the desktop is not freezing after the screensaver anymore.

Question: xfce bug or not?

Ahh today i've did an new testing update. Hmm

inxi -Fxzc0
Host: Kernel: 5.0.9-2-MANJARO x86_64 bits: 64 compiler: gcc v: 8.3.0 Desktop: Xfce 4.13.3git-UNKNOWN
Distro: Manjaro Linux

says Xfce 4.13.3git-UNKNOWN

while today

xfwm4 --version
This is xfwm4 version 4.13.1git.UNKNOWN

This is xfwm4 version 4.13.1git.UNKNOWN (revision UNKNOWN) for Xfce 4.13
	Released under the terms of the GNU General Public License.
	Compiled against GTK+-3.24.5, using GTK+-3.24.8.

???
So either inxi or xfwm4 --version is not correct?

A tip of Oliver Fourdan from xfce helped.

1. Re-enable compositing:

  $ xfconf-query -c xfwm4 -p /general/use_compositing -s true

2. Set "glx" for vblank method:

  $ xfconf-query -c xfwm4 -p /general/vblank_mode -s glx

3. Restart xfwm4 to pick the new vblank mode:

  $ xfwm4 --replace &

This made the bug gone. But some things are still unclear..?
https://bugzilla.xfce.org/show_bug.cgi?id=15325#c20
It might be a kernel bug, which i do not understand...

5 Likes

@jonathon
So this is the solution. One has to apply this commands into manjaro.
What are the next steps?

See:
https://bugzilla.xfce.org/show_bug.cgi?id=15325#c26

Hmmm. can someone else perform a new installation and test this also? And verify my results?

LF

@jonathon
Ahh a self fixing update

(In reply to Linuxfreak from comment #27)
> So Bug #15325 is solved?

Yes, as far as xfwm4 is concerned, it is.

> So the manajro team has to apply also your hint in comment 16 ?

No, there will be a new version of xfwm4 which uses GLX by default - By the way, this particular issue is related to the driver and does not affect all other drivers in general.

see:
https://bugzilla.xfce.org/show_bug.cgi?id=15325#c28

3 Likes

This is why bug reports are a good thing. Nicely done. :slight_smile:

1 Like

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