[Intel-gfx] commit 15512021eb3975a8c2366e3883337e252bb0eee5 causes white spots in console screens

[Saarinen, Jani]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Jani
> Nikula
> Sent: torstai 14. huhtikuuta 2022 11.32
> To: François Valenduc <francoisvalenduc at gmail.com>; Lisovskiy, Stanislav
> <stanislav.lisovskiy at intel.com>
> Cc: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org
> Subject: Re: [Intel-gfx] commit 15512021eb3975a8c2366e3883337e252bb0eee5
> causes white spots in console screens
> 
> On Thu, 14 Apr 2022, François Valenduc <francoisvalenduc at gmail.com> 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 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.
> >>>> 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-bu
> >>>>> gs
> >>>>>
> >>>>>
> >>>>> --
> >>>>> 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.
Agree. 

> 
> Thanks,
> Jani.
> 
> 
> --
> Jani Nikula, Intel Open Source Graphics Center