Nvidia proprietary driver (2080 Ti) stopped working after upgrading kernel to backports on Debian Buster
by MontgomeryDixon from LinuxQuestions.org on (#55MCN)
Debian Buster, Cinnamon then XFCE, RTX 2080 Ti
I installed the Nvidia proprietary driver version 418.113 from the non-free repo. I can't use Nouveau as I do rendering in Blender and (soon) gaming.
Only problem was random freezing that required hard reboots, but switching from Cinnamon to XFCE cured that 100%.
Then I upgraded the kernel from 4.19 to 5.6 in the hopes that the wifi would work (Intel AX 201, I think). Wifi doesn't work, but I'm not worried, ethernet works fine. On the reboot I saw the message amid the text that said 'Failed to start Nvidia persistence daemon' or something close. And Cinnamon reported it was running without hardware acceleration.
Things I tried that didn't work:
1. Upgraded the Nvidia driver to 440.82 from backports
2. Tried `systemctl start nvidia-persistenced.service` resulted in:
Code:Job for nvidia-persistenced.service failed because the control process exited with the error code.So I went through /var/log/syslog and found:
Code:debian systemd[1]: Starting NVIDIA Persistence Daemon...
debian nvidia-persistenced: Started (3084)
debian nvidia-persistenced: Failed to query NVIDIA devices. Please ensure that the NVIDIA device files (/dev/nvidia*) exist, and that user 116 has read and write permissions for those files.
debian nvidia-persistenced: Shutdown (3084)
debian nvidia-persistenced[3083]: nvidia-persistenced failed to initialize. Check syslog for more details.
debian systemd[1]: nvidia-persistenced.service: Control process exited, code=exited, status=1/FAILURE
debian systemd[1]: nvidia-persistenced.service Failed with result 'exit-code'.
debian systemd[1]: Failed to start NVIDIA Persistence Daemon`ls` doesn't show anything named 'nvidia' in /dev
Any help would be appreciated. Let me know if you need more info.


I installed the Nvidia proprietary driver version 418.113 from the non-free repo. I can't use Nouveau as I do rendering in Blender and (soon) gaming.
Only problem was random freezing that required hard reboots, but switching from Cinnamon to XFCE cured that 100%.
Then I upgraded the kernel from 4.19 to 5.6 in the hopes that the wifi would work (Intel AX 201, I think). Wifi doesn't work, but I'm not worried, ethernet works fine. On the reboot I saw the message amid the text that said 'Failed to start Nvidia persistence daemon' or something close. And Cinnamon reported it was running without hardware acceleration.
Things I tried that didn't work:
1. Upgraded the Nvidia driver to 440.82 from backports
2. Tried `systemctl start nvidia-persistenced.service` resulted in:
Code:Job for nvidia-persistenced.service failed because the control process exited with the error code.So I went through /var/log/syslog and found:
Code:debian systemd[1]: Starting NVIDIA Persistence Daemon...
debian nvidia-persistenced: Started (3084)
debian nvidia-persistenced: Failed to query NVIDIA devices. Please ensure that the NVIDIA device files (/dev/nvidia*) exist, and that user 116 has read and write permissions for those files.
debian nvidia-persistenced: Shutdown (3084)
debian nvidia-persistenced[3083]: nvidia-persistenced failed to initialize. Check syslog for more details.
debian systemd[1]: nvidia-persistenced.service: Control process exited, code=exited, status=1/FAILURE
debian systemd[1]: nvidia-persistenced.service Failed with result 'exit-code'.
debian systemd[1]: Failed to start NVIDIA Persistence Daemon`ls` doesn't show anything named 'nvidia' in /dev
Any help would be appreciated. Let me know if you need more info.