Bug#1040254: xserver-xorg-video-nouveau: Regression: Crashes with "(EE) Caught signal 11 (Segmentation fault). Server aborting" upon start after dist-upgrade from Bullseye to Bookworm
On 2023-07-03 23:26 +0200, Axel Beckert wrote:
> Package: xserver-xorg-video-nouveau
Wrong package, this driver is not involved in the crash. In fact, it is
not even used on your system (or by default, except for really ancient
graphics cards).
> (Feel free to reassign this bug to e.g. xserver-xorg-core/2:21.1.7-3 or
> libgl1-mesa-dri/22.3.6-1+deb12u1 or similar if you think the bug is
> nevertheless rather in there.)
>From your backtrace I can tell it is most likely in one of these
packages. /usr/lib/xorg/modules/drivers/modesetting_drv.so is part of
xserver-xorg-core, /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so is part
of libgl1-mesa-dri. My bet would be that the latter is the culprit, so
you could try different mesa versions from snapshot.debian.org to see
where the problem got introduced.
> There was no xorg.conf besides the system-provided /etc/xorg.conf.d/*
> files present. Now there is one needed due to the three-headed monkey,
> eh three-headed screen setup.
>
> So basically nouveau with that graphics card (and maybe my screen setup
> which includes two rotated screens, see below) is impossible due to a
> severe regression in (likely) the noveau driver.
As I said, the nouveau Xorg driver is not even used. To enable it, create
the following minimal /etc/X11/xorg.conf:
--8<---------------cut here---------------start------------->8---
Section "Device"
Identifier "n"
Driver "nouveau"
EndSection
--8<---------------cut here---------------end--------------->8---
Perhaps it works better than the default modesetting driver. It can
hardly be worse on your system. ;-)
> https://bugs.debian.org/1033222 in libgl1-mesa-dri looks also similar
> and here it's also on amd64, but a seemingly very different NVidia
> graphics card.
Quite likely the same issue, I would say.
Cheers,
Sven
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