commit 15512021eb3975a8c2366e3883337e252bb0eee5 causes white spots in console screens

[Jani Nikula]

On Wed, 13 Apr 2022, François Valenduc <francoisvalenduc at gmail.com> wrote:
> Commit 15512021eb3975a8c2366e3883337e252bb0eee5 
> (15512021eb3975a8c2366e3883337e252bb0eee5) causes a lof of white spots 
> to appears on the right upper corner of all console screens (see 
> https://drive.google.com/file/d/13GabEvOIKSAj5yox6ybAZEDu3Ixncw5Q/view). 
> git-bisect shows that this is the offending commit and if I revert it, 
> the problem goes away. The problem still occurs with kernel 5.18-rc2 and 
> to all stable trees where it was applied.
> Can somebody explains what happens ?
>
> The video card is the following: VGA compatible controller: Intel 
> Corporation WhiskeyLake-U GT2 [UHD Graphics 620] (rev 02) (prog-if 00 
> [VGA controller])
>
> Please tell me if you need more info.

That's commit 15512021eb39 ("drm/i915: Workaround broken BIOS DBUF
configuration on TGL/RKL"), adding Cc's.

Please file a report at fdo gitlab [1] and attach dmesg etc. there.

Thanks,
Jani.


[1] https://gitlab.freedesktop.org/drm/intel/wikis/How-to-file-i915-bugs


-- 
Jani Nikula, Intel Open Source Graphics Center