November 26, 2020 Comments 0 Ubuntu Forums 131 Views

Black Screen when starting gdm after upgrade from 18.04. to 20.04. on nvidia drivers

Problem Description:
Starting any display manager (tried gdm, lightdm, sddm) while using nvidia drivers (tried 390, 440, 450, 455) after upgrading Ubuntu from 18.04. to 20.04. results in a black screen.

Kernel:
$uname -r

Code:

5.6.0-1033-oem

I did not find any noticeable errors in /var/log/syslog /var/log/Xorg.0.log or ~/.xsession-errors. Also no noticeable errors in demesg or systemctl status display-manager
nvidia drivers seem to load fine. nvidia-smi displays my card Geforce GTX 950M and lsmod lists nvidia drivers.

$nvidia-smi

Code:

$lsmod | grep nvidia

Code:

nvidia_uvm 962560 0 nvidia_drm 45056 4 nvidia_modeset 1114112 4 nvidia_drm nvidia 20680704 205 nvidia_uvm,nvidia_modeset drm_kms_helper 208896 1 nvidia_drm drm 540672 7 drm_kms_helper,nvidia_drm ipmi_msghandler 110592 2 ipmi_devintf,nvidia

The graphics card is an Optimus card.
with prime-select nvidia is selected:

$sudo prime-select nvidia

Code:

Info: the nvidia profile is already set

I tried to follow advice on this forum (e.g. adding nomodeset to grub, blacklisting nouveau, etc.) to no avail.

purging all nvidia drivers results in the display manager starting under nouveau driver.
before the upgrade to 20.04. the setup was running fine with nvidia-440 drivers.

Any ideas what I could do?

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