how to Simple Desktop Display Manager
Simple Desktop Display Manager (sddm)

verifier le status :

systemctl status sddm.service

chercher dans le journal la chaine :

sddm[

ou

Simple Desktop Display Manager

il y a plusieurs evenements :

quand il y a un problème:
lire le journal :

journalctl

extrait du journal quand il y a un probleme :

avril 27 22:29:18 fblanc322004linux systemd[1]: Starting Simple Desktop Display Manager...
avril 27 22:29:18 fblanc322004linux systemd[1]: Started Simple Desktop Display Manager.
avril 27 22:29:18 fblanc322004linux sddm[1587]: Display server failed to start. Exiting
avril 27 22:29:19 fblanc322004linux systemd[1]: Stopped Simple Desktop Display Manager.
avril 27 22:29:24 fblanc322004linux systemd[1]: Failed to start Simple Desktop Display Manager.

quand tout est ok :

avril 28 09:26:35 fblanc322004linux systemd[1]: Starting Simple Desktop Display Manager...
avril 28 09:26:35 fblanc322004linux systemd[1]: Started Unattended Upgrades Shutdown.
avril 28 09:26:35 fblanc322004linux systemd[1]: Started Simple Desktop Display Manager.
avril 28 09:26:38 fblanc322004linux sddm[1401]: Display server started.

lspci | grep -e VGA -e 3D

 01:00.0 VGA compatible controller: NVIDIA Corporation TU117GLM [Quadro T1000 Mobile] (rev a1)

/var/log/Xorg.0.log.old

(WW) Falling back to old probe method for fbdev
WW --> WARNING
II --> INFO
EE -- ERROR

lspci -k

Pour verifier l'etat du driver  de la carte graphique

sudo lshw -C display

...

hwinfo --gfxcard --short

nvidia-smi

installer le driver nvidia

sudo apt install nvidia-utils-530
sudo apt install nvidia-driver-530 nvidia-dkms-530

nvidia-smi

nvidia-settings

sudo lshw -c display
show
---- ko before installation driver -------
-----UNCLAIMED : peripherique non reconnu
*-display                  
      description: VGA compatible controller
      product: TU117GLM [Quadro T1000 Mobile]
      vendor: NVIDIA Corporation
      physical id: 0
      bus info: pci@0000:01:00.0
      version: a1
      width: 64 bits
      clock: 33MHz
      capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
      configuration: driver=nvidia latency=0
      resources: irq:16 memory:e1000000-e1ffffff memory:b0000000-bfffffff memory:c0000000-c1ffffff ioport:3000(size=128) memory:e2080000-e20fffff
 *-display UNCLAIMED
      description: Display controller
      product: Intel Corporation
      vendor: Intel Corporation
      physical id: 2
      bus info: pci@0000:00:02.0
      version: 05
      width: 64 bits
      clock: 33MHz
      capabilities: pciexpress msi pm bus_master cap_list
      configuration: latency=0
      resources: memory:e0000000-e0ffffff memory:d0000000-dfffffff ioport:4000(size=64)

after installation driver :
sudo lshw -c display
-----------ok after installation driver -----------
fblanc322004linux@fblanc322004linux:~$ sudo lshw -c display
[sudo] password for fblanc322004linux:
*-display
description: VGA compatible controller
product: TU117GLM [Quadro T1000 Mobile]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:147 memory:e1000000-e1ffffff memory:b0000000-bfffffff memory:c0000000-c1ffffff ioport:3000(size=128) memory:e2080000-e20fffff
*-display
description: Display controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 05
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm bus_master cap_list
configuration: driver=i915 latency=0
resources: irq:144 memory:e0000000-e0ffffff memory:d0000000-dfffffff ioport:4000(size=64)