KDE plasma not starting on boot, only manually through the commandline

I am new to Manjaro/Arch coming from Debian/Ubuntu. I am running the latest stable Manjaro on Proxmox using GPU passthrough. But that should not matter for the issue I’m facing.
The passthrough works and I can see the boot process until “CUPS Sceduler started”. After that, there is no progress as I was expecting KDE Plasma to start (which works when using a VirtIO GPU instead of the installed AMD Radeon Pro WX4100).
I then switch to TTY2, log in and execute startplasma-wayland. This works immediately.

Here is the journalctl -b log:

Jun 06 21:58:51 manjaro kernel: Linux version 6.9.2-1-MANJARO (builduser@fv-az1434-290) (gcc (GCC) 14.1.1 20240522, GNU ld (GNU Binutils) 2.42.0) #1 SMP PREEMPT_DYNAMIC Mon May 27 03:56:18 UTC 2024
Jun 06 21:58:51 manjaro kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-6.9-x86_64 root=UUID=de0e5513-fd10-4c55-8860-e0343ad9f1c0 rw resume=UUID=c0bc8bed-b6fd-4683-9c07-cbf67d29cc38 udev.log_priority=3
----- snip -----
Jun 06 21:58:52 manjaro systemd[1]: Starting Modem Manager...
Jun 06 21:58:52 manjaro systemd[1]: Started Network Manager.
Jun 06 21:58:52 manjaro systemd[1]: Reached target Network.
Jun 06 21:58:52 manjaro systemd[1]: Starting Network Manager Script Dispatcher Service...
Jun 06 21:58:52 manjaro systemd[1]: Starting CUPS Scheduler...
Jun 06 21:58:52 manjaro systemd[1]: Starting Permit User Sessions...
Jun 06 21:58:52 manjaro ModemManager[586]: <msg> ModemManager (version 1.22.0-1) starting in system bus...
Jun 06 21:58:52 manjaro systemd[1]: Finished Permit User Sessions.
Jun 06 21:58:52 manjaro systemd[1]: Started Network Manager Script Dispatcher Service.
Jun 06 21:58:52 manjaro systemd[1]: Started Command Scheduler.
Jun 06 21:58:52 manjaro systemd[1]: Starting Hold until boot process finishes up...
Jun 06 21:58:52 manjaro systemd[1]: Starting Terminate Plymouth Boot Screen...
Jun 06 21:58:52 manjaro crond[596]: (CRON) STARTUP (1.7.2)
Jun 06 21:58:52 manjaro crond[596]: (CRON) INFO (Syslog will be used instead of sendmail.)
Jun 06 21:58:52 manjaro crond[596]: (CRON) INFO (RANDOM_DELAY will be scaled with factor 89% if used.)
Jun 06 21:58:52 manjaro crond[596]: (CRON) INFO (running with inotify support)
Jun 06 21:58:52 manjaro systemd[1]: Started CUPS Scheduler.
Jun 06 21:58:52 manjaro systemd[1]: Received SIGRTMIN+21 from PID 240 (plymouthd).
Jun 06 21:58:52 manjaro systemd[1]: Started Modem Manager.
Jun 06 21:58:52 manjaro kernel: NET: Registered PF_QIPCRTR protocol family
Jun 06 21:58:52 manjaro systemd[1]: Received SIGRTMIN+21 from PID 240 (plymouthd).
Jun 06 21:58:52 manjaro systemd[1]: Finished Hold until boot process finishes up.
Jun 06 21:58:52 manjaro systemd[1]: Finished Terminate Plymouth Boot Screen.
Jun 06 21:58:52 manjaro systemd[1]: Reached target Multi-User System.
Jun 06 21:58:52 manjaro systemd[1]: Started Simple Desktop Display Manager.
Jun 06 21:58:52 manjaro systemd[1]: Reached target Graphical Interface.
Jun 06 21:58:52 manjaro systemd[1]: Startup finished in 6.065s (kernel) + 1.898s (userspace) = 7.963s.
Jun 06 21:58:52 manjaro sddm[610]: Initializing...
Jun 06 21:58:52 manjaro sddm[610]: Starting...
Jun 06 21:58:52 manjaro sddm[610]: Logind interface found
Jun 06 21:58:52 manjaro sddm[610]: Adding new display...
Jun 06 21:58:52 manjaro sddm[610]: Loaded empty theme configuration
Jun 06 21:58:52 manjaro sddm[610]: Xauthority path: "/run/sddm/xauth_MKrhdG"
Jun 06 21:58:52 manjaro sddm[610]: Using VT 2
Jun 06 21:58:52 manjaro sddm[610]: Display server starting...
Jun 06 21:58:52 manjaro sddm[610]: Writing cookie to "/run/sddm/xauth_MKrhdG"
Jun 06 21:58:52 manjaro sddm[610]: Running: /usr/bin/X -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_MKrhdG -noreset -displayfd 16
Jun 06 21:58:52 manjaro kernel: iwlwifi 0000:08:0f.0: Registered PHC clock: iwlwifi-PTP, with index: 0
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.0284] device (wlp8s15): set-hw-addr: set MAC address to 66:70:0C:DF:23:A3 (scanning)
Jun 06 21:58:53 manjaro kernel: usbcore: registered new interface driver snd-usb-audio
Jun 06 21:58:53 manjaro kernel: usb 9-2.4: Found UVC 1.00 device HD Pro Webcam C920 (046d:08e5)
Jun 06 21:58:53 manjaro mtp-probe[624]: checking bus 9, device 4: "/sys/devices/pci0000:00/0000:00:1e.0/0000:05:01.0/0000:06:11.0/usb9/9-2/9-2.4"
Jun 06 21:58:53 manjaro kernel: usbcore: registered new interface driver uvcvideo
Jun 06 21:58:53 manjaro mtp-probe[624]: bus: 9, device: 4 was not an MTP device
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2199] modem-manager: ModemManager not available
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2206] policy: auto-activating connection 'Wired connection 1' (d37d3f85-c61c-36cd-bb96-68bb4ee13624)
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2209] device (lo): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'external')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2217] device (enp6s18): Activation: starting connection 'Wired connection 1' (d37d3f85-c61c-36cd-bb96-68bb4ee13624)
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2217] device (lo): state change: secondaries -> activated (reason 'none', sys-iface-state: 'external')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2220] device (lo): Activation: successful, device activated.
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2224] device (enp6s18): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2226] manager: NetworkManager state is now CONNECTING
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2227] device (enp6s18): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2233] device (enp6s18): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2235] dhcp4 (enp6s18): activation: beginning transaction (timeout in 45 seconds)
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2253] dhcp4 (enp6s18): state changed new lease, address=192.168.178.65, acd pending
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.2261] modem-manager: ModemManager now available
Jun 06 21:58:53 manjaro systemd[1]: Starting WPA supplicant...
Jun 06 21:58:53 manjaro systemd[1]: Started WPA supplicant.
Jun 06 21:58:53 manjaro wpa_supplicant[628]: Successfully initialized wpa_supplicant
Jun 06 21:58:53 manjaro kernel: input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input6
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.3020] device (wlp8s15): supplicant interface state: internal-starting -> disconnected
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.3021] Wi-Fi P2P device controlled by interface wlp8s15 created
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.3023] manager: (p2p-dev-wlp8s15): new 802.11 Wi-Fi P2P device (/org/freedesktop/NetworkManager/Devices/4)
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.3024] device (p2p-dev-wlp8s15): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.3031] device (wlp8s15): state change: unavailable -> disconnected (reason 'supplicant-available', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.3035] device (p2p-dev-wlp8s15): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4169] dhcp4 (enp6s18): state changed new lease, address=192.168.178.65
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4174] policy: set 'Wired connection 1' (enp6s18) as default for IPv4 routing and DNS
Jun 06 21:58:53 manjaro dbus-broker-launch[525]: Activation request for 'org.freedesktop.resolve1' failed: The systemd unit 'dbus-org.freedesktop.resolve1.service' could not be found.
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4250] device (enp6s18): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4265] device (enp6s18): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4268] device (enp6s18): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4270] manager: NetworkManager state is now CONNECTED_SITE
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4272] device (enp6s18): Activation: successful, device activated.
Jun 06 21:58:53 manjaro NetworkManager[527]: <info>  [1717703933.4678] manager: NetworkManager state is now CONNECTED_GLOBAL
Jun 06 21:58:53 manjaro sddm[610]: Setting default cursor
Jun 06 21:58:53 manjaro sddm[610]: Running display setup script  "/usr/share/sddm/scripts/Xsetup"
Jun 06 21:58:53 manjaro sddm[610]: Display server started.
Jun 06 21:58:53 manjaro sddm[610]: Socket server starting...
Jun 06 21:58:53 manjaro sddm[610]: Socket server started.
Jun 06 21:58:53 manjaro sddm[610]: Loading theme configuration from "/usr/share/sddm/themes/breath/theme.conf"
Jun 06 21:58:53 manjaro sddm[610]: Greeter starting...
Jun 06 21:58:53 manjaro sddm-helper[639]: [PAM] Starting...
Jun 06 21:58:53 manjaro sddm-helper[639]: [PAM] Authenticating...
Jun 06 21:58:53 manjaro sddm-helper[639]: [PAM] returning.
Jun 06 21:58:53 manjaro sddm-helper[639]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=960) by (uid=0)
Jun 06 21:58:53 manjaro systemd-logind[532]: New session c1 of user sddm.
Jun 06 21:58:53 manjaro systemd[1]: Created slice User Slice of UID 960.
Jun 06 21:58:53 manjaro systemd[1]: Starting User Runtime Directory /run/user/960...
Jun 06 21:58:53 manjaro systemd[1]: Finished User Runtime Directory /run/user/960.
Jun 06 21:58:53 manjaro systemd[1]: Created slice Slice /system/systemd-coredump.
Jun 06 21:58:53 manjaro systemd[1]: Starting User Manager for UID 960...
Jun 06 21:58:53 manjaro systemd[1]: Started Process Core Dump (PID 641/UID 0).
Jun 06 21:58:53 manjaro dbus-broker-launch[525]: Activation request for 'org.freedesktop.home1' failed: The systemd unit 'dbus-org.freedesktop.home1.service' could not be found.
Jun 06 21:58:53 manjaro (systemd)[644]: pam_warn(systemd-user:setcred): function=[pam_sm_setcred] flags=0x8002 service=[systemd-user] terminal=[] user=[sddm] ruser=[<unknown>] rhost=[<unknown>]
Jun 06 21:58:53 manjaro (systemd)[644]: pam_unix(systemd-user:session): session opened for user sddm(uid=960) by sddm(uid=0)
Jun 06 21:58:53 manjaro systemd[644]: Queued start job for default target Main User Target.
Jun 06 21:58:53 manjaro systemd[644]: Created slice User Application Slice.
Jun 06 21:58:53 manjaro systemd[644]: Reached target Paths.
Jun 06 21:58:53 manjaro systemd[644]: Reached target Timers.
Jun 06 21:58:53 manjaro systemd[644]: Starting D-Bus User Message Bus Socket...
Jun 06 21:58:53 manjaro systemd[644]: Listening on GnuPG network certificate management daemon.
Jun 06 21:58:53 manjaro systemd[644]: Listening on GnuPG cryptographic agent and passphrase cache (access for web browsers).
Jun 06 21:58:53 manjaro systemd[644]: Listening on GnuPG cryptographic agent and passphrase cache (restricted).
Jun 06 21:58:53 manjaro systemd[644]: Listening on GnuPG cryptographic agent (ssh-agent emulation).
Jun 06 21:58:53 manjaro systemd[644]: Listening on GnuPG cryptographic agent and passphrase cache.
Jun 06 21:58:53 manjaro systemd[644]: Listening on GnuPG public key management service.
Jun 06 21:58:53 manjaro systemd[644]: Listening on p11-kit server.
Jun 06 21:58:53 manjaro systemd[644]: Listening on PipeWire PulseAudio.
Jun 06 21:58:53 manjaro systemd[644]: Listening on PipeWire Multimedia System Sockets.
Jun 06 21:58:53 manjaro systemd[644]: Listening on D-Bus User Message Bus Socket.
Jun 06 21:58:53 manjaro systemd[644]: Reached target Sockets.
Jun 06 21:58:53 manjaro systemd[644]: Reached target Basic System.
Jun 06 21:58:53 manjaro systemd[1]: Started User Manager for UID 960.
Jun 06 21:58:53 manjaro systemd[1]: Started Session c1 of User sddm.
Jun 06 21:58:53 manjaro systemd[644]: Starting Update XDG user dir configuration...
Jun 06 21:58:53 manjaro sddm-helper[639]: Writing cookie to "/tmp/xauth_AkDtgD"
Jun 06 21:58:53 manjaro sddm-helper[639]: Starting X11 session: "" "/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:0-wTsTms --theme /usr/share/sddm/themes/breath"
Jun 06 21:58:53 manjaro sddm[610]: Greeter session started successfully
Jun 06 21:58:53 manjaro systemd[644]: Finished Update XDG user dir configuration.
Jun 06 21:58:53 manjaro systemd[644]: Reached target Main User Target.
Jun 06 21:58:53 manjaro systemd[644]: Startup finished in 158ms.
Jun 06 21:58:53 manjaro sddm-greeter-qt6[656]: High-DPI autoscaling not Enabled
Jun 06 21:58:53 manjaro sddm-greeter-qt6[656]: could not connect to display :0
Jun 06 21:58:53 manjaro sddm-greeter-qt6[656]: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to load the Qt xcb platform plugin.
Jun 06 21:58:53 manjaro sddm-greeter-qt6[656]: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Jun 06 21:58:53 manjaro sddm-greeter-qt6[656]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                               
                                               Available platform plugins are: vkkhrdisplay, minimalegl, linuxfb, wayland, wayland-egl, eglfs, minimal, offscreen, vnc, xcb.
Jun 06 21:58:53 manjaro systemd[1]: Started Process Core Dump (PID 658/UID 0).
Jun 06 21:58:54 manjaro systemd-coredump[660]: Process 656 (sddm-greeter-qt) of user 960 dumped core.
                                               
                                               Stack trace of thread 656:
                                               #0  0x000074c4e6ca8e44 n/a (libc.so.6 + 0x94e44)
                                               #1  0x000074c4e6c50a30 raise (libc.so.6 + 0x3ca30)
                                               #2  0x000074c4e6c384c3 abort (libc.so.6 + 0x244c3)
                                               #3  0x000074c4e728c6b7 n/a (libQt6Core.so.6 + 0x8c6b7)
                                               #4  0x000074c4e728ce5b _ZNK14QMessageLogger5fatalEPKcz (libQt6Core.so.6 + 0x8ce5b)
                                               #5  0x000074c4e78daa45 n/a (libQt6Gui.so.6 + 0xdaa45)
                                               #6  0x000074c4e797af38 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt6Gui.so.6 + 0x17af38)
                                               #7  0x000074c4e7348d45 _ZN23QCoreApplicationPrivate4initEv (libQt6Core.so.6 + 0x148d45)
                                               #8  0x000074c4e797afce _ZN22QGuiApplicationPrivate4initEv (libQt6Gui.so.6 + 0x17afce)
                                               #9  0x000074c4e7973bdd _ZN15QGuiApplicationC2ERiPPci (libQt6Gui.so.6 + 0x173bdd)
                                               #10 0x000062020d8b24e6 n/a (sddm-greeter-qt6 + 0x134e6)
                                               #11 0x000074c4e6c39c88 n/a (libc.so.6 + 0x25c88)
                                               #12 0x000074c4e6c39d4c __libc_start_main (libc.so.6 + 0x25d4c)
                                               #13 0x000062020d8b5445 n/a (sddm-greeter-qt6 + 0x16445)
                                               ELF object binary architecture: AMD x86-64
Jun 06 21:58:54 manjaro systemd[1]: systemd-coredump@1-658-0.service: Deactivated successfully.
Jun 06 21:58:54 manjaro sddm-helper[639]: [PAM] Closing session
Jun 06 21:58:54 manjaro sddm-helper[639]: pam_unix(sddm-greeter:session): session closed for user sddm
Jun 06 21:58:54 manjaro sddm-helper[639]: [PAM] Ended.
Jun 06 21:58:54 manjaro sddm[610]: Auth: sddm-helper exited with 6
Jun 06 21:58:54 manjaro systemd[1]: session-c1.scope: Deactivated successfully.
Jun 06 21:58:54 manjaro sddm[610]: Greeter stopped. SDDM::Auth::HelperExitStatus(6)
Jun 06 21:58:54 manjaro systemd-logind[532]: Session c1 logged out. Waiting for processes to exit.
Jun 06 21:58:54 manjaro systemd-logind[532]: Removed session c1.
Jun 06 21:58:54 manjaro systemd-coredump[645]: Process 612 (Xorg) of user 0 dumped core.
                                               
                                               Stack trace of thread 612:
                                               #0  0x00007bad22b4ee44 n/a (libc.so.6 + 0x94e44)
                                               #1  0x00007bad22af6a30 raise (libc.so.6 + 0x3ca30)
                                               #2  0x00007bad22ade4c3 abort (libc.so.6 + 0x244c3)
                                               #3  0x00005a0eb02cd12e OsAbort (Xorg + 0x14b12e)
                                               #4  0x00005a0eb02ce5e7 FatalError (Xorg + 0x14c5e7)
                                               #5  0x00005a0eb02d5268 n/a (Xorg + 0x153268)
                                               #6  0x00007bad22af6ae0 n/a (libc.so.6 + 0x3cae0)
                                               #7  0x00007bad21d35266 n/a (vmmouse_drv.so + 0x2266)
                                               #8  0x00005a0ed3433660 n/a (n/a + 0x0)
                                               ELF object binary architecture: AMD x86-64
Jun 06 21:58:54 manjaro systemd[1]: systemd-coredump@0-641-0.service: Deactivated successfully.
Jun 06 21:58:54 manjaro sddm[610]: Display server stopped.
Jun 06 21:58:54 manjaro sddm[610]: Running display stop script  QList("/usr/share/sddm/scripts/Xstop")
Jun 06 21:58:54 manjaro sddm[610]: Socket server stopping...
Jun 06 21:58:54 manjaro sddm[610]: Socket server stopped.
Jun 06 21:58:54 manjaro sddm[610]: Removing display SDDM::Display(0x5cd488b31a70) ...
Jun 06 21:58:54 manjaro sddm[610]: Adding new display...
Jun 06 21:58:54 manjaro sddm[610]: Loaded empty theme configuration
Jun 06 21:58:54 manjaro sddm[610]: Xauthority path: "/run/sddm/xauth_uwWvOX"
Jun 06 21:58:54 manjaro sddm[610]: Using VT 2
Jun 06 21:58:54 manjaro sddm[610]: Display server starting...
Jun 06 21:58:54 manjaro sddm[610]: Writing cookie to "/run/sddm/xauth_uwWvOX"
Jun 06 21:58:54 manjaro sddm[610]: Running: /usr/bin/X -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_uwWvOX -noreset -displayfd 18
Jun 06 21:58:55 manjaro systemd[1]: Started Process Core Dump (PID 689/UID 0).
Jun 06 21:58:55 manjaro systemd-coredump[690]: Process 676 (Xorg) of user 0 dumped core.
                                               
                                               Stack trace of thread 676:
                                               #0  0x00007b1e8c83ae44 n/a (libc.so.6 + 0x94e44)
                                               #1  0x00007b1e8c7e2a30 raise (libc.so.6 + 0x3ca30)
                                               #2  0x00007b1e8c7ca4c3 abort (libc.so.6 + 0x244c3)
                                               #3  0x000057b6412dc12e OsAbort (Xorg + 0x14b12e)
                                               #4  0x000057b6412dd5e7 FatalError (Xorg + 0x14c5e7)
                                               #5  0x000057b6412e4268 n/a (Xorg + 0x153268)
                                               #6  0x00007b1e8c7e2ae0 n/a (libc.so.6 + 0x3cae0)
                                               #7  0x00007b1e8ba21266 n/a (vmmouse_drv.so + 0x2266)
                                               #8  0x000057b64fc35d30 n/a (n/a + 0x0)
                                               ELF object binary architecture: AMD x86-64
Jun 06 21:58:55 manjaro systemd[1]: systemd-coredump@2-689-0.service: Deactivated successfully.
Jun 06 21:58:55 manjaro sddm[610]: Failed to read display number from pipe
Jun 06 21:58:55 manjaro sddm[610]: Display server stopping...
Jun 06 21:58:55 manjaro sddm[610]: Attempt 1 starting the Display server on vt 2 failed
Jun 06 21:58:56 manjaro wpa_supplicant[628]: wlp8s15: CTRL-EVENT-REGDOM-CHANGE init=DRIVER type=COUNTRY alpha2=DE
Jun 06 21:58:56 manjaro NetworkManager[527]: <info>  [1717703936.5440] manager: startup complete
Jun 06 21:58:56 manjaro ModemManager[586]: <msg> [base-manager] couldn't check support for device '/sys/devices/pci0000:00/0000:00:1e.0/0000:05:01.0/0000:06:12.0': not supported by any plugin
Jun 06 21:58:56 manjaro ModemManager[586]: <msg> [base-manager] couldn't check support for device '/sys/devices/pci0000:00/0000:00:1e.0/0000:05:03.0/0000:08:0f.0': not supported by any plugin
Jun 06 21:58:57 manjaro systemd[1]: systemd-rfkill.service: Deactivated successfully.
Jun 06 21:58:57 manjaro sddm[610]: Display server starting...
Jun 06 21:58:57 manjaro sddm[610]: Writing cookie to "/run/sddm/xauth_uwWvOX"
Jun 06 21:58:57 manjaro sddm[610]: Running: /usr/bin/X -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_uwWvOX -noreset -displayfd 15
Jun 06 21:58:58 manjaro systemd[1]: Started Process Core Dump (PID 713/UID 0).
Jun 06 21:58:59 manjaro systemd-coredump[714]: Process 700 (Xorg) of user 0 dumped core.
                                               
                                               Stack trace of thread 700:
                                               #0  0x000070a448dcfe44 n/a (libc.so.6 + 0x94e44)
                                               #1  0x000070a448d77a30 raise (libc.so.6 + 0x3ca30)
                                               #2  0x000070a448d5f4c3 abort (libc.so.6 + 0x244c3)
                                               #3  0x00005b63f2b7c12e OsAbort (Xorg + 0x14b12e)
                                               #4  0x00005b63f2b7d5e7 FatalError (Xorg + 0x14c5e7)
                                               #5  0x00005b63f2b84268 n/a (Xorg + 0x153268)
                                               #6  0x000070a448d77ae0 n/a (libc.so.6 + 0x3cae0)
                                               #7  0x000070a447fb6266 n/a (vmmouse_drv.so + 0x2266)
                                               #8  0x00005b6413af5eb0 n/a (n/a + 0x0)
                                               ELF object binary architecture: AMD x86-64
Jun 06 21:58:59 manjaro systemd[1]: systemd-coredump@3-713-0.service: Deactivated successfully.
Jun 06 21:58:59 manjaro sddm[610]: Failed to read display number from pipe
Jun 06 21:58:59 manjaro sddm[610]: Display server stopping...
Jun 06 21:58:59 manjaro sddm[610]: Attempt 2 starting the Display server on vt 2 failed
Jun 06 21:59:01 manjaro sddm[610]: Display server starting...
Jun 06 21:59:01 manjaro sddm[610]: Writing cookie to "/run/sddm/xauth_uwWvOX"
Jun 06 21:59:01 manjaro sddm[610]: Running: /usr/bin/X -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_uwWvOX -noreset -displayfd 15
Jun 06 21:59:02 manjaro systemd[1]: Started Process Core Dump (PID 737/UID 0).
Jun 06 21:59:02 manjaro systemd-coredump[738]: Process 724 (Xorg) of user 0 dumped core.
                                               
                                               Stack trace of thread 724:
                                               #0  0x000079f30b4a2e44 n/a (libc.so.6 + 0x94e44)
                                               #1  0x000079f30b44aa30 raise (libc.so.6 + 0x3ca30)
                                               #2  0x000079f30b4324c3 abort (libc.so.6 + 0x244c3)
                                               #3  0x000059f7d6dd712e OsAbort (Xorg + 0x14b12e)
                                               #4  0x000059f7d6dd85e7 FatalError (Xorg + 0x14c5e7)
                                               #5  0x000059f7d6ddf268 n/a (Xorg + 0x153268)
                                               #6  0x000079f30b44aae0 n/a (libc.so.6 + 0x3cae0)
                                               #7  0x000079f30a689266 n/a (vmmouse_drv.so + 0x2266)
                                               #8  0x000059f7e91d5bd0 n/a (n/a + 0x0)
                                               ELF object binary architecture: AMD x86-64
Jun 06 21:59:02 manjaro systemd[1]: systemd-coredump@4-737-0.service: Deactivated successfully.
Jun 06 21:59:02 manjaro sddm[610]: Failed to read display number from pipe
Jun 06 21:59:02 manjaro sddm[610]: Display server stopping...
Jun 06 21:59:02 manjaro sddm[610]: Attempt 3 starting the Display server on vt 2 failed
Jun 06 21:59:02 manjaro sddm[610]: Could not start Display server on vt 2
Jun 06 21:59:02 manjaro systemd[1]: NetworkManager-dispatcher.service: Deactivated successfully.
Jun 06 21:59:04 manjaro systemd[1]: Stopping User Manager for UID 960...
Jun 06 21:59:04 manjaro systemd[644]: Activating special unit Exit the Session...
Jun 06 21:59:04 manjaro systemd[644]: Stopped target Main User Target.
Jun 06 21:59:04 manjaro systemd[644]: Stopped target Basic System.
Jun 06 21:59:04 manjaro systemd[644]: Stopped target Paths.
Jun 06 21:59:04 manjaro systemd[644]: Stopped target Sockets.
Jun 06 21:59:04 manjaro systemd[644]: Stopped target Timers.
Jun 06 21:59:04 manjaro systemd[644]: Closed D-Bus User Message Bus Socket.
Jun 06 21:59:04 manjaro systemd[644]: Closed GnuPG network certificate management daemon.
Jun 06 21:59:04 manjaro systemd[644]: Closed GnuPG cryptographic agent and passphrase cache (access for web browsers).
Jun 06 21:59:04 manjaro systemd[644]: Closed GnuPG cryptographic agent and passphrase cache (restricted).
Jun 06 21:59:04 manjaro systemd[644]: Closed GnuPG cryptographic agent (ssh-agent emulation).
Jun 06 21:59:04 manjaro systemd[644]: Closed GnuPG cryptographic agent and passphrase cache.
Jun 06 21:59:04 manjaro systemd[644]: Closed GnuPG public key management service.
Jun 06 21:59:04 manjaro systemd[644]: Closed p11-kit server.
Jun 06 21:59:04 manjaro systemd[644]: Closed PipeWire PulseAudio.
Jun 06 21:59:04 manjaro systemd[644]: Closed PipeWire Multimedia System Sockets.
Jun 06 21:59:04 manjaro systemd[644]: Removed slice User Application Slice.
Jun 06 21:59:04 manjaro systemd[644]: Reached target Shutdown.
Jun 06 21:59:04 manjaro systemd[644]: Finished Exit the Session.
Jun 06 21:59:04 manjaro systemd[644]: Reached target Exit the Session.
Jun 06 21:59:04 manjaro (sd-pam)[647]: pam_unix(systemd-user:session): session closed for user sddm
Jun 06 21:59:04 manjaro systemd[1]: user@960.service: Deactivated successfully.
Jun 06 21:59:04 manjaro systemd[1]: Stopped User Manager for UID 960.
Jun 06 21:59:04 manjaro systemd[1]: Stopping User Runtime Directory /run/user/960...
Jun 06 21:59:04 manjaro systemd[1]: run-user-960.mount: Deactivated successfully.
Jun 06 21:59:04 manjaro systemd[1]: user-runtime-dir@960.service: Deactivated successfully.
Jun 06 21:59:04 manjaro systemd[1]: Stopped User Runtime Directory /run/user/960.
Jun 06 21:59:04 manjaro systemd[1]: Removed slice User Slice of UID 960.
Jun 06 21:59:22 manjaro systemd-timesyncd[521]: Contacted time server 176.9.90.88:123 (2.manjaro.pool.ntp.org).
Jun 06 21:59:22 manjaro systemd-timesyncd[521]: Initial clock synchronization to Thu 2024-06-06 21:59:22.133408 CEST.
Jun 06 21:59:22 manjaro systemd[1]: systemd-hostnamed.service: Deactivated successfully.
Jun 06 21:59:28 manjaro systemd[1]: Started Getty on tty2.
Jun 06 21:59:28 manjaro agetty[756]: failed to open credentials directory
Jun 06 21:59:33 manjaro login[756]: pam_unix(login:session): session opened for user sebastian(uid=1000) by sebastian(uid=0)
Jun 06 21:59:33 manjaro systemd-logind[532]: New session 2 of user sebastian.
Jun 06 21:59:33 manjaro systemd[1]: Created slice User Slice of UID 1000.
Jun 06 21:59:33 manjaro systemd[1]: Starting User Runtime Directory /run/user/1000...
Jun 06 21:59:33 manjaro systemd[1]: Finished User Runtime Directory /run/user/1000.
Jun 06 21:59:33 manjaro systemd[1]: Starting User Manager for UID 1000...
Jun 06 21:59:33 manjaro (systemd)[764]: pam_warn(systemd-user:setcred): function=[pam_sm_setcred] flags=0x8002 service=[systemd-user] terminal=[] user=[sebastian] ruser=[<unknown>] rhost=[<unknown>]
Jun 06 21:59:33 manjaro (systemd)[764]: pam_unix(systemd-user:session): session opened for user sebastian(uid=1000) by sebastian(uid=0)
Jun 06 21:59:34 manjaro systemd[764]: Queued start job for default target Main User Target.
Jun 06 21:59:34 manjaro systemd-journald[341]: /var/log/journal/497798844a68424b9572a43f75b78076/user-1000.journal: Journal file uses a different sequence number ID, rotating.
Jun 06 21:59:34 manjaro systemd[764]: Created slice User Application Slice.
Jun 06 21:59:34 manjaro systemd[764]: Reached target Paths.
Jun 06 21:59:34 manjaro systemd[764]: Reached target Timers.
Jun 06 21:59:34 manjaro systemd[764]: Starting D-Bus User Message Bus Socket...
Jun 06 21:59:34 manjaro systemd[764]: Listening on GnuPG network certificate management daemon.
Jun 06 21:59:34 manjaro systemd[764]: Listening on GnuPG cryptographic agent and passphrase cache (access for web browsers).
Jun 06 21:59:34 manjaro systemd[764]: Listening on GnuPG cryptographic agent and passphrase cache (restricted).
Jun 06 21:59:34 manjaro systemd[764]: Listening on GnuPG cryptographic agent (ssh-agent emulation).
Jun 06 21:59:34 manjaro systemd[764]: Listening on GnuPG cryptographic agent and passphrase cache.
Jun 06 21:59:34 manjaro systemd[764]: Listening on GnuPG public key management service.
Jun 06 21:59:34 manjaro systemd[764]: Listening on p11-kit server.
Jun 06 21:59:34 manjaro systemd[764]: Listening on PipeWire PulseAudio.
Jun 06 21:59:34 manjaro systemd[764]: Listening on PipeWire Multimedia System Sockets.
Jun 06 21:59:34 manjaro systemd[764]: Listening on D-Bus User Message Bus Socket.
Jun 06 21:59:34 manjaro systemd[764]: Reached target Sockets.
Jun 06 21:59:34 manjaro systemd[764]: Reached target Basic System.
Jun 06 21:59:34 manjaro systemd[1]: Started User Manager for UID 1000.
Jun 06 21:59:34 manjaro systemd[764]: Starting Update XDG user dir configuration...
Jun 06 21:59:34 manjaro systemd[1]: Started Session 2 of User sebastian.
Jun 06 21:59:34 manjaro login[756]: LOGIN ON tty2 BY sebastian
Jun 06 21:59:34 manjaro systemd[764]: Finished Update XDG user dir configuration.
Jun 06 21:59:34 manjaro systemd[764]: Reached target Main User Target.
Jun 06 21:59:34 manjaro systemd[764]: Startup finished in 156ms.
Jun 06 21:59:34 manjaro systemd[1]: Starting Network Manager Wait Online...
Jun 06 21:59:34 manjaro systemd[1]: Starting PackageKit Daemon...
Jun 06 21:59:34 manjaro PackageKit[796]: daemon start
Jun 06 21:59:34 manjaro systemd[1]: Finished Network Manager Wait Online.
Jun 06 21:59:34 manjaro systemd[1]: Reached target Network is Online.
Jun 06 21:59:34 manjaro systemd[1]: Started PackageKit Daemon.
Jun 06 21:59:34 manjaro PackageKit[796]: search-file transaction /1_babdbacd from uid 1000 finished with success after 185ms

As you can see, the sddm system starts but fails with some messages, retrying three times before giving up. Please help me make sense of those messages.

What I’ve tried:

  • installed all AMD drivers as described on wiki archlinux org/title/AMDGPU (mesa, vulkan-radeon, libva-mesa-driver, mesa-vdpau)
  • Added amdgpu to mkinitcpio as described in wiki archlinux org/title/Kernel_mode_setting#Early_KMS_start and called mkinitcpio -P

Which did not fix the issue, of course.

So, what’s the issue? Let me know which configs you need.

Another forum thread had the solution: QEMU VM no X after stable update - #2 by freggel.doe
It seems some kind of vmmouse driver was installed that crashed when not actually having to use it (I think?)

sudo pacman -Rns xf86-input-vmmouse

did the trick.

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