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List:       debian-user
Subject:    Re: video issue following latest bullseye update
From:       "D. R. Evans" <doc.evans () gmail ! com>
Date:       2023-05-31 17:43:00
Message-ID: f5d512ec-925e-70c6-f9e7-ca218fd7b1e8 () gmail ! com
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I'm sorry I'm so slow to respond... it's all a matter of trying to put aside 
quality uninterruptible time to work on this.

Since the problem is not so bad that I can't perform work with this computer, 
a lot of other work-related things unfortunately have to take priority.

Felix Miata wrote on 5/23/23 13:26:

> 
>> I currently get:
> 
>> [ZB:~] sudo inxi -GSaz
>> System:    Kernel: 5.10.0-23-amd64 x86_64 bits: 64 compiler: gcc v: 10.2.1
>>              parameters: BOOT_IMAGE=/BOOT/debian@/vmlinuz-5.10.0-23-amd64
>> root=ZFS=/ROOT/debian ro root=ZFS=rpool/ROOT/debian
>>              Desktop: Trinity R14.1.1~[DEVELOPMENT] tk: Qt 3.5.0 info: kicker
>> wm: Twin 3.0 dm: LightDM 1.26.0
> 
> The line wrapping suggests you never succeeded to do "inxi -U". As seen below,

The officially supported version of inxi on bullseye [inxi 3.3.01-00 
(2021-02-08), according to "inxi --version"] seems to have "-U" disabled. 
Which I guess makes sense.

> 
> Are all users of ZFS supposed to include two root= parameters on their linu lines?

What an excellent question. I don't know for sure, but I suspect that it's 
related to the fact that I am running root-on-ZFS (i.e., the / filesystem is 
on a ZFS disk). It's been like that for many years on this machine, and I 
believe that when I first installed root-on-ZFS, the instructions told me to 
do that. FWIW, I have another root-on-ZFS system, and it also has two "root=" 
parameters.

> 
>> But I am still seeing the original problem I reported.
> 
> Could it be that your PC doesn't like LightDM? Try switching to TDM. All my

TDM has never worked properly on this machine; TDM doesn't correctly figure 
out which video card to use (at least, it didn't last time I tried it), so it 
presents me with a black screen, leaving me having to ssh into the machine and 
reconfigure it to use LightDM.

> Debians use it only. I also use TDM to run Plasma on Leap and Tumbleweed.
> 
> I switched from the modesetting DIX driver to the nouveau DDX driver via:
> 
> # cat /etc/X11/xorg.conf.d/15-ddxdrv.conf
> #Section "OutputClass"
> Section "Device"
>    Identifier "DDX"
> #       MatchDriver "amdgpu"
> #       Driver "amdgpu"
> #       MatchDriver "intel"
> #       Driver "intel"
> #       MatchDriver "modesetting"
> #       Driver "modesetting"
> #       MatchDriver "nouveau"
>          Driver "nouveau"
> #       MatchDriver "radeon"
> #       Driver "radeon"
> EndSection
> 
> I was unable to detect any kind of video corruption in the TDE 14.1.x relnotes
> window, or doing what follows in TDE's Konsole:

I don't think it can be a TDE issue, as the same problem exists on this 
machine if I run the official KDE that is currently in bullseye.

> 
> I suppose your issue could involve a timing coincidence, and your problem may be
> failing gfxcard RAM.

I suppose anything is possible. But since this began as soon as I applied a 
bullseye update, it seems much more likely that it's a nouveau issue that 
landed on this machine when I performed the update.

> 
> The modesetting DIX is newer technology than the reverse-engineered,
> "experimental" nouveau DDX. Whatever happened when you attempted switching to the
> DIX should not have happened. Do you have /etc/X11/xorg.conf or any content in
> /etc/X11/xorg.conf.d/ directed to gfx (device, monitor, screen, driver) other than
> the file I suggested?

Here is xorg.conf (which I believe was auto-created at some point; I have no 
notes that say that I created it):

[ZB:X11] cat xorg.conf | pastebinit
https://paste.debian.net/1281598/
[ZB:X11]

And /etc/X11/xorg.conf.d/ just contains the file you suggested (currently set 
to nouveau):

----

[ZB:xorg.conf.d] ls -al
total 11
drwxr-xr-x  2 root root  3 May 22 14:46 .
drwxr-xr-x 14 root root 25 Nov  9  2021 ..
-rw-r--r--  1 root root 88 May 22 14:46 50-device.conf
[ZB:xorg.conf.d] cat *
Section "Device"
   Identifier "DDX"
#       Driver "modesetting"
         Driver "nouveau"
EndSection
[ZB:xorg.conf.d]

----

   Doc

-- 
Web:  http://enginehousebooks.com/drevans

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