Login screen keeps black

[AlfredoCubitos]

Hi,

I'm using Tumbleweed with an Nvidia card. I have the nvidia card enabled at boot time. Since the last update, the login screen keeps black.

I found out that prime copies the /usr/share/prime/xorg-nvidia.conf to /etc/X11/xorg.conf.d/90-nvidia.conf

When I empty this file /etc/X11/xorg.conf.d/90-nvidia.conf the login screen appears But this workaround may lead to other issues e.g. Steam games freezes the box.

With a complete /etc/X11/xorg.conf.d/90-nvidia.conf systemctl status display-manager throws a Auth: sddm-helper exited with 6 error

Any Ideas to fix this issue?

System Info Operating System: openSUSE Tumbleweed 20220213 KDE Plasma Version: 5.24.0 KDE Frameworks Version: 5.90.0 Qt Version: 5.15.2 Kernel Version: 5.16.8-1-default (64-bit) Graphics Platform: X11 Processors: 16 × Intel® Core™ i7-10875H CPU @ 2.30GHz Memory: 15.4 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics

[sndirsch]

I think this is a duplicate of https://bugzilla.suse.com/show_bug.cgi?id=1195885 Please try with kernel boot option initcall_blacklist=simpledrm_platform_driver_init as mentioned there.

[sndirsch]

How to achieve this. See instructions here https://bugzilla.suse.com/show_bug.cgi?id=1195887#c14 https://bugzilla.suse.com/show_bug.cgi?id=1195887#c15

[AlfredoCubitos]

Sorry, but that issue you mentioned is different. At least sddm starts but crashes, so I can login to a tty console. ;-)

Anyway, I tried the solution, but didn't work either.

I think that is an X authorization issue.

I red all the SDB:Nvidia and archlinux wikis, tried all the hints but nothing works.

Any hints where to look are welcome :-)

[bomiyr]

@AlfredoCubitos Which Nvidia driver do you use? I have similar problem after updating to G06(v510.x). In "offload" mode only black screen with mouse pointer instead of sddm. If login in tty and execute sudo prime-select unset it's back to normal (except power consumption is higher than in 'offload' mode). Do you have the same behavior?

[AlfredoCubitos]

@bomiyr I'm using the same driver as you. Your solution disables the nvidia driver, this leads to the behavior you described.

I commented out the Intel sections in the /etc/X11/xorg.conf.d/90-nvidia.conf file. That works for me. The nvidia driver is loaded and all works as expected :-)

Now the content looks like this:

#Section "ServerLayout"
 #   Identifier "layout"
  #  Screen "nvidia"
  #  Inactive "intel"
  #  Inactive "modesetting"
#EndSection

#Section "Screen"
 #   Identifier "intel"
 #   Device "intel"
#EndSection

#Section "Device"
#    Identifier "intel"
#    Driver "intel"
#EndSection

Section "Screen"
    Identifier "modesetting"
    Device "modesetting"
EndSection

Section "Device"
    Identifier "modesetting"
    Driver "modesetting"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
EndSection

@sndirsch What do think about this solution?

[sndirsch]

@AlfredoCubitos You didn't remove any intel section. You removed nvidia device section.

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:X:X:X"
    Option "DPI" "96 x 96"
    Option "AllowEmptyInitialConfiguration"
    Option "AllowExternalGpus"
EndSection

I'm afraid at least for others it's still needed.

[sndirsch]

Oh no. You commented it out. You didn't remove it. But it's weird, that the nvidia device section is missing in your /etc/X11/xorg.conf.d/90-nvidia.conf

[sndirsch]

@AlfredoCubitos Seems you still have xf86-video-intel package installed. I suggest to uninstall it and I think then you can use an unmodified /etc/X11/xorg.conf.d/90-nvidia.conf.

[AlfredoCubitos]

@sndirsch sorry, that didn't work either :-( I removed the xf86-video-intel driver, but the problem remains.

[AlfredoCubitos]

@sndirsch sorry, that didn't work either :-( I removed the xf86-video-intel driver, but the problem remains.

[AlfredoCubitos]

The problem seems to be the Intel driver. I commented out only the Intel Driver section and it works also. @sndirsch Do you know which driver is loaded when I deinstalled the xf86-video-intel package and where where to look for errors?

[sndirsch]

First it triesintel X driver. If this fails (no xf86-video-intel package installed) it should load modesetting X driver. Could you attach your /var/log/Xorg.0.log with unmodified /etc/X11/xorg.conf.d/90-nvidia.conf

[AlfredoCubitos]

here my Xorg.0.log for the original configuration. Xorg_intel.log

In addition, on reboot it was not sufficient to disable only the Intel Screen section, I had also to disable (uncomment) the ServerLayout section. So, on reboot the ServerLayout section enabled causes the same error, when the Intel Screen Section is disabled While restart the display manager with systemctl restart display-manager its sufficient only to disable the Intel Screen section

My workaround for this issue is to change the /usr/share/prime/xorg-nvidia.conf

Section "Screen"
    Identifier "modesetting"
    Device "modesetting"
EndSection

Section "Device"
    Identifier "modesetting"
    Driver "modesetting"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:X:X:X"
    Option "DPI" "96 x 96"
    Option "AllowEmptyInitialConfiguration"
    Option "AllowExternalGpus"
EndSection

[sndirsch]

Nothing obvious in the X logfile. Please try with an older kernel and with this unmodified xorg.conf file. It still smells like this simpledrm issue.

[sndirsch]

@AlfredoCubitos Could you update this ticket, please? Is this still an issue with latest Tumbleweed and kernel? Meanwhile we (re-)enabled simpledrm in our kernel, but it's disabled by default when installing our nvidia kernel packages by adding "nosimplefb=1" as kernel boot option in %post. Please try with unmodified X config files.

[AlfredoCubitos]

This issue is solved :-)

[sndirsch]

Nice to hear this. Thanks for prompt feedback! :-)