[Nouveau] Blank screen after upgrade Fedora 34/XFCE -> Fedora 36/XFCE

[Klaus Ebbe Grue]

Hi nouveau at lists.freedesktop.org,


I hope someone on this list can point me in some useful direction concerning the following problem:


After upgrade from Fedora 34/XFCE to Fedora 36/XFCE, I experience a black screen instead of a login prompt, unless I make a file named /etc/X11/xorg.conf.d/90-monitor.conf which contains eg


Section "Monitor"
        Identifier "DP-1"
        Option "PreferredMode" "720x480"
EndSection

Before the upgrade from Fedora 34 to 36, everything worked if the file looked like this:

Section "Monitor"
        Identifier "DP-1"
        Modeline "3840x2160" 533.25 3840 3888 3920 4000 2160 2163 2168 2222 +hsync -vsync
        Option "PreferredMode" "3840x2160"
EndSection

But that does not work on my Fedora 36.

I use XFCE instead of Gnome. XFCE seems to use X as opposed to Fedora in general and Gnome in particular who use Wayland.

If I hand compile the EDID from the screen, I find the following resolutions: Established timings: 800x600, 800x600, 800x600, 800x600, 832x624, 1024x768, 1024x768, 1024x768, 1280x1024. Standard timings: 1920x1080, 1680x1050, 1440x900, 1280x1024, 1280x960, 1280x720. Detailed timings: 3840x2160, 2560x1440, 1280x720, 720x480, 720x576, 1920x2160. The EDID looks fine as far as I can see.

I have tried all standard and detailed timings and three established timings (boot at runlevel 3, modify 90-monitor.conf, telinit 5, repeat). All resolutions except 3840x2160, 2560x1440 and 1920x1080 work acceptably. 3840x2160 and 2560x1440 give a black screen and a monitor poweroff. 1920x1080 gives a noisy, psychedelic screen which remotely resembles a login screen.

If I boot with no 90-monitor.conf at all then /var/log/Xorg.0.log seems to be in conflict with itself. First, all resolutions including 3840x2160 are recognized and agree with what I got out of reading the EDID. But then Xorg.0.log says:

[    38.974] (II) modeset(0): Not using default mode "2560x1440" (bad mode clock/interlace/doublescan)

But 3840x2160 is the default mode. 3840x2160 is the first detailed timing record. So it seems that first 3840x2160 is recognized, then ignored, then 2560x1440 is frowned upon, then used anyways.

I have attached /var/log/messages and /var/log/Xorg.0.log from a Fedora 36 and a Fedora 34 boot. I do not yet have a kernel log, but I hope I can get one by doing an ssh into the box after the monitor goes blank.

By the way, when I boot Fedora 36 to runlevel 3 then the monitor switches to a resolution of 3840x2160 and I get a tiny command line. It is when I then do telinit 5 that the screen goes blank.


In preparation of asking a question on the present list, I have run through https://nouveau.freedesktop.org/TroubleShooting.html in general and the section "Are you clear of other kernel drivers that break Nouveau" in particular. I think I have no other video drivers than Nouveau, but I have done this:


sudo find /usr -type f -iname "*nvidia*" -print > stdout 2>stderr


I can see some nvidia stuff in stdout. In particular, I can see a file named typec_nvidia.ko.xz, and TroubleShooting.html warns about a file named nvidia.ko. Can anyone on the list tell if there is something suspicious in the attached search-nvidia-stdout?


Cheers,

Klaus

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