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

[François Valenduc]

Le 14/04/22 à 11:51, Saarinen, Jani a écrit :
>
>> -----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
As requested, I filled a bug on freedesktop 
(https://gitlab.freedesktop.org/drm/intel/-/issues/5711)