Black screen after update

Hello
I’m stuck since the latest update (black screen but tty ok).

Here some logs.

Thanks.

System:    Kernel: 5.4.77-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 Console: tty 2 DM: SDDM Distro: Manjaro Linux 
Machine:   Type: Desktop Mobo: MSI model: B150M MORTAR (MS-7972) v: 2.0 serial: <filter> UEFI: American Megatrends v: C.C0 
           date: 12/05/2017 
CPU:       Info: Quad Core model: Intel Core i5-6400 bits: 64 type: MCP arch: Skylake-S rev: 3 L2 cache: 6144 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 21607 
           Speed: 800 MHz min/max: 800/3300 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 
Graphics:  Device-1: Intel HD Graphics 530 vendor: Micro-Star MSI driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:1912 
           Display: server: X.org 1.20.9 driver: intel unloaded: modesetting alternate: fbdev,vesa tty: 240x67 
           Mesa Intel (R) HD Graphics 530 (SKL GT2)
Audio:     Device-1: Intel 100 Series/C230 Series Family HD Audio vendor: Micro-Star MSI driver: snd_hda_intel v: kernel 
           bus ID: 00:1f.3 chip ID: 8086:a170 
           Sound Server: ALSA v: k5.4.77-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Micro-Star MSI driver: r8168 
           v: 8.048.03-NAPI port: e000 bus ID: 02:00.0 chip ID: 10ec:8168 
           IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Intel 82574L Gigabit Network driver: e1000e v: 3.2.6-k port: d000 bus ID: 03:00.0 chip ID: 8086:10d3 
           IF: enp3s0 state: down mac: <filter> 
Drives:    Local Storage: total: 7.28 TiB used: 23.16 GiB (0.3%) 
           ID-1: /dev/sda vendor: Seagate model: ST2000DM001-1ER164 size: 1.82 TiB speed: 6.0 Gb/s rotation: 7200 rpm 
           serial: <filter> rev: CC25 scheme: MBR 
           ID-2: /dev/sdb vendor: Seagate model: ST2000DM001-1ER164 size: 1.82 TiB speed: 6.0 Gb/s rotation: 7200 rpm 
           serial: <filter> rev: CC25 scheme: MBR 
           ID-3: /dev/sdc vendor: Seagate model: ST2000DM001-1ER164 size: 1.82 TiB speed: 6.0 Gb/s rotation: 7200 rpm 
           serial: <filter> rev: CC26 scheme: MBR 
           ID-4: /dev/sdd vendor: Seagate model: ST2000DM001-1ER164 size: 1.82 TiB speed: 6.0 Gb/s rotation: 7200 rpm 
           serial: <filter> rev: CC26 scheme: GPT 
Partition: ID-1: / size: 47.94 GiB used: 23.16 GiB (48.3%) fs: ext4 dev: /dev/sdd2 
Swap:      Alert: No Swap data was found. 
Sensors:   System Temperatures: cpu: 29.8 C mobo: 27.8 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 148 Uptime: 4m Memory: 15.52 GiB used: 309.6 MiB (1.9%) Init: systemd v: 246 Compilers: gcc: 10.2.0 
           clang: 11.0.0 Packages: pacman: 1462 Shell: Bash v: 5.0.18 running in: tty 2 inxi: 3.1.08

-    - Logs begin at Wed 2020-08-26 15:26:23 CEST, end at Fri 2020-11-20 08:41:47 CET. --
    nov. 20 08:38:02 marc-pc kernel: resource sanity check: requesting [mem 0xfdffe800-0xfe0007ff], which spans more than pnp 00:09 [mem 0xfdb00000-0xfdffffff]
    nov. 20 08:38:02 marc-pc kernel: caller pmc_core_probe+0x85/0x2e0 mapping multiple BARs
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT1._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT1._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT1._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT1._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT4._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT4._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT2._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT2._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT5._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT5._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT4._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT4._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT2._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT2._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT5._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT5._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT0._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT0._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.PRT0._GTF.DSSP], AE_NOT_FOUND (20190816/psargs-330)
    nov. 20 08:38:02 marc-pc kernel: ACPI Error: Aborting method \_SB.PCI0.SAT0.PRT0._GTF due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
    nov. 20 08:38:02 marc-pc systemd[1]: /usr/lib/systemd/system/plymouth-start.service:15: Unit configured to use KillMode=none. This is unsafe, as it disables systemd's process lifecycle management for the service. Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'. Support for KillMode=none is deprecated and will eventually be removed.
    nov. 20 08:38:08 marc-pc kernel: r8168: loading out-of-tree module taints kernel.
    nov. 20 08:38:08 marc-pc kernel: r8168  Copyright (C) 2020  Realtek NIC software team <nicfae@realtek.com> 
                                      This program comes with ABSOLUTELY NO WARRANTY; for details, please see <http://www.gnu.org/licenses/>. 
                                      This is free software, and you are welcome to redistribute it under certain conditions; see <http://www.gnu.org/licenses/>. 
    nov. 20 08:38:10 marc-pc rpc.idmapd[381]: Setting log level to 0
    nov. 20 08:38:14 marc-pc kernel: kauditd_printk_skb: 12 callbacks suppressed
    nov. 20 08:38:15 marc-pc rpc.statd[421]: Flags: TI-RPC
    nov. 20 08:38:16 marc-pc kernel: NFSD: Using nfsdcld client tracking operations.
    nov. 20 08:38:20 marc-pc kernel: kauditd_printk_skb: 9 callbacks suppressed
    nov. 20 08:38:22 marc-pc sddm-helper[497]: gkr-pam: no password is available for user
    nov. 20 08:38:23 marc-pc NetworkManager[387]: <warn>  [1605857903.0442] ndisc[0x55d7a2ea90f0,"enp2s0"]: failure sending router solicitation: Aucun espace tampon disponible (105)
    nov. 20 08:38:25 marc-pc sddm[415]: Auth: sddm-helper exited with 1
    nov. 20 08:38:30 marc-pc kernel: kauditd_printk_skb: 4 callbacks suppressed

[   152.205] _XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
[   152.205] _XSERVTransMakeAllCOTSServerListeners: server already running
[   152.206] (EE) 
Fatal server error:
[   152.206] (EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE) 
[   152.206] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[   152.206] (EE) Please also check the log file at "/home/marc/.local/share/xorg/Xorg.0.log" for additional information.
[   152.206] (EE) 
[   152.206] (EE) Server terminated with error (1). Closing log file.

I also had a black screen after stable-update-2020-11-18

but I could solve it by downgrading to sddm 0.18.1-3:
pacman -U /var/cache/pacman/pkg/sddm-0.18.1-3-x86_64.pkg.tar.zst
Don’t know if it will work for you, but it might be worth a try.