On Wed, Apr 13, 2022 at 08:12:20PM +0300, Jani Nikula wrote: > On Wed, 13 Apr 2022, François Valenduc <francoisvalenduc@xxxxxxxxx> 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. That commit looks like it is just disabling all the planes, if wrong dbuf/wm configuration is detected. However it should do that only once during boot as I understand. Are you sure that is exactly this commit which is causing this? Does the issue appear always? Ville Syrjälä, thoughts? Stan > > Thanks, > Jani. > > > [1] https://gitlab.freedesktop.org/drm/intel/wikis/How-to-file-i915-bugs > > > -- > Jani Nikula, Intel Open Source Graphics Center
