On Thu, 14 Apr 2022, François Valenduc <francoisvalenduc@xxxxxxxxx> wrote: > Le 14/04/22 à 10:03, Lisovskiy, Stanislav a écrit : >> On Thu, Apr 14, 2022 at 08:33:35AM +0200, François Valenduc wrote: >>> Le 14/04/22 à 08:31, Lisovskiy, Stanislav a écrit : >>>> 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 >>> As I said, git-bisect shows it's the offending commit and if I revert it, >>> the problem doesn't happens. Otherwise, it always occurs. >>> >>> François >>> >> Does it just happen all the time or some steps/certain circumstances needed >> for it to happen? >> >> Only suspicion after looking briefly is that once suspend/resume is done >> it might be messing something up. Just a quick guess.. >> >> Stan > > It occurs permantently as soon as I boot my computer. I'd appreciate that bug being filed, and the discussion moved there, so all the details and history are in one place. Thanks, Jani. -- Jani Nikula, Intel Open Source Graphics Center
