Hi,
Some time ago I plugged a second VGA to try passthrough to a VM. I forgot it inside my system because I never finished my tests and recently I try to remove it but the system didn't start any more.
I found several articles about that issue but with different folder structures and solution that could damage my system. I can not afford to let something like that to happen right now.
I am kind of newbie in Linux, so PLEASE, go easy with me.

When I was trying to make the passthrough I didf the following:
I first tried to use VirtualBox and also tried pciattach, but I failed
Then I install KVM, but I failed to complete the passthrough again

When i removed the second VGA I tried:
to edit the /etc/sddm.conf.d/kde_settings.conf not so much of success
to edit the sddm.conf
to VBoxManage modifyvm Win10_game --pcidetach 03:00.0@01:08.0 "there was nothing attached"
to install gdm3, but I prefer the sddm better
to update to the latest and try different drivers, no luck

This is the second VGA
IOMMU Group 21 03:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP108 [GeForce GT 1030] [10de:1d01] (rev a1)

here is a syslog that may have something interesting

Code: Select all

Nov 22 11:01:17 MyComputer systemd[1]: Started Self Monitoring and Reporting Technology (SMART) Daemon.
Nov 22 11:01:17 MyComputer systemd[1]: sddm.service: Scheduled restart job, restart counter is at 3.
Nov 22 11:01:17 MyComputer systemd[1]: Stopped Simple Desktop Display Manager.
Nov 22 11:01:17 MyComputer systemd[1]: Starting Detect the available GPUs and deal with any system changes...
Nov 22 11:01:17 MyComputer systemd[1]: gpu-manager.service: Succeeded.
Nov 22 11:01:17 MyComputer systemd[1]: Finished Detect the available GPUs and deal with any system changes.
Nov 22 11:01:17 MyComputer systemd[1]: Starting Simple Desktop Display Manager...
Nov 22 11:01:17 MyComputer systemd[1]: Started Simple Desktop Display Manager.
Nov 22 11:01:17 MyComputer sddm[5273]: Initializing...
Nov 22 11:01:17 MyComputer sddm[5273]: Starting...
Nov 22 11:01:17 MyComputer sddm[5273]: Logind interface found
Nov 22 11:01:17 MyComputer sddm[5273]: Adding new display on vt 1 ...
Nov 22 11:01:17 MyComputer sddm[5273]: Loading theme configuration from ""
Nov 22 11:01:17 MyComputer sddm[5273]: Display server starting...
Nov 22 11:01:17 MyComputer sddm[5273]: Running: /usr/bin/X -nolisten tcp -auth /var/run/sddm/{2d524b5c-c224-433b-95e7-1793ce039377} -background none -noreset -displayfd 17 -seat seat0 vt1
Nov 22 11:01:17 MyComputer sddm[5273]: Failed to read display number from pipe
Nov 22 11:01:17 MyComputer sddm[5273]: Display server failed to start. Exiting
Nov 22 11:01:17 MyComputer systemd[1]: sddm.service: Main process exited, code=dumped, status=6/ABRT
Nov 22 11:01:17 MyComputer systemd[1]: sddm.service: Failed with result 'core-dump'.
Nov 22 11:01:18 MyComputer NetworkManager[1182]: <info>  [1637571678.8548] device (enp3s0): carrier: link connected
Nov 22 11:01:18 MyComputer kernel: [   13.500155] r8169 0000:03:00.0 enp3s0: Link is Up - 100Mbps/Half - flow control off
Nov 22 11:01:19 MyComputer systemd[1]: sddm.service: Scheduled restart job, restart counter is at 4.
Nov 22 11:01:19 MyComputer systemd[1]: Stopped Simple Desktop Display Manager.
Nov 22 11:01:19 MyComputer systemd[1]: Starting Detect the available GPUs and deal with any system changes...
Nov 22 11:01:19 MyComputer systemd[1]: gpu-manager.service: Succeeded.
Nov 22 11:01:19 MyComputer systemd[1]: Finished Detect the available GPUs and deal with any system changes.
Nov 22 11:01:19 MyComputer systemd[1]: Starting Simple Desktop Display Manager...
Nov 22 11:01:19 MyComputer systemd[1]: Started Simple Desktop Display Manager.
Nov 22 11:01:19 MyComputer sddm[6401]: Initializing...
Nov 22 11:01:19 MyComputer sddm[6401]: Starting...
Nov 22 11:01:19 MyComputer sddm[6401]: Logind interface found
Nov 22 11:01:19 MyComputer sddm[6401]: Adding new display on vt 1 ...
Nov 22 11:01:19 MyComputer sddm[6401]: Loading theme configuration from ""
Nov 22 11:01:19 MyComputer sddm[6401]: Display server starting...
Nov 22 11:01:19 MyComputer sddm[6401]: Running: /usr/bin/X -nolisten tcp -auth /var/run/sddm/{6e414e31-18ea-40e7-8ded-9247cd12535e} -background none -noreset -displayfd 17 -seat seat0 vt1
Nov 22 11:01:19 MyComputer sddm[6401]: Failed to read display number from pipe
Nov 22 11:01:19 MyComputer sddm[6401]: Display server failed to start. Exiting
Nov 22 11:01:19 MyComputer systemd[1]: sddm.service: Main process exited, code=dumped, status=6/ABRT
Nov 22 11:01:19 MyComputer systemd[1]: sddm.service: Failed with result 'core-dump'.
Nov 22 11:01:20 MyComputer systemd[1]: sddm.service: Scheduled restart job, restart counter is at 5.
Nov 22 11:01:20 MyComputer systemd[1]: Stopped Simple Desktop Display Manager.
Nov 22 11:01:20 MyComputer systemd[1]: gpu-manager.service: Start request repeated too quickly.
Nov 22 11:01:20 MyComputer systemd[1]: gpu-manager.service: Failed with result 'start-limit-hit'.
Nov 22 11:01:20 MyComputer systemd[1]: Failed to start Detect the available GPUs and deal with any system changes.
Nov 22 11:01:20 MyComputer systemd[1]: sddm.service: Start request repeated too quickly.
Nov 22 11:01:20 MyComputer systemd[1]: sddm.service: Failed with result 'core-dump'.
Nov 22 11:01:20 MyComputer systemd[1]: Failed to start Simple Desktop Display Manager.
Nov 22 11:01:20 MyComputer systemd[1]: sddm.service: Triggering OnFailure= dependencies.
Nov 22 11:01:20 MyComputer systemd[1]: Starting Terminate Plymouth Boot Screen...
Nov 22 11:01:20 MyComputer systemd[1]: plymouth-quit.service: Succeeded.
Nov 22 11:01:20 MyComputer systemd[1]: Finished Terminate Plymouth Boot Screen.


thanks in advance