[Intel-gfx] Regression on 5.19.12, display flickering on Framework laptop

[Thorsten Leemhuis]

On 03.10.22 19:48, Ville Syrjälä wrote:
> On Mon, Oct 03, 2022 at 08:45:18PM +0300, Ville Syrjälä wrote:
>> On Sat, Oct 01, 2022 at 12:07:39PM +0200, Thorsten Leemhuis wrote:
>>> On 30.09.22 14:26, Jerry Ling wrote:
>>>>
>>>> looks like someone has done it:
>>>> https://bbs.archlinux.org/viewtopic.php?pid=2059823#p2059823
>>>>
>>>> and the bisect points to:
>>>>
>>>> |# first bad commit: [fc6aff984b1c63d6b9e54f5eff9cc5ac5840bc8c]
>>>> drm/i915/bios: Split VBT data into per-panel vs. global parts Best, Jerry |
>>>
>>> FWIW, that's 3cf050762534 in mainline. Adding Ville, its author to the
>>> list of recipients.
>>
>> I definitely had no plans to backport any of that stuff,
>> but I guess the automagics did it anyway.
>>
>> Looks like stable is at least missing this pile of stuff:
>> 50759c13735d drm/i915/pps: Keep VDD enabled during eDP probe
>> 67090801489d drm/i915/pps: Reinit PPS delays after VBT has been fully parsed
>> 8e75e8f573e1 drm/i915/pps: Split PPS init+sanitize in two
>> 586294c3c186 drm/i915/pps: Stash away original BIOS programmed PPS delays
>> 89fcdf430599 drm/i915/pps: Don't apply quirks/etc. to the VBT PPS delays if they haven't been initialized
>> 60b02a09598f drm/i915/pps: Introduce pps_delays_valid()
>>
>> But dunno if even that is enough.

If you need testers: David (now CCed) apparently has a affected machine
and offered to test patches in a different subthread of this thread.

>> This bug report is probably the same thing:
>> https://gitlab.freedesktop.org/drm/intel/-/issues/7013

Sounds like it.

 > Also cc intel-gfx...

Ahh, sorry, should have done that when I CCed you.

Ciao, Thorsten


>>> Did anyone check if a revert on top of 5.19.12 works easily and solves
>>> the problem?
>>>
>>> And does anybody known if mainline affected, too?
>>>
>>> Ciao, Thorsten
>>>
>>>
>>>> On 9/30/22 07:11, Slade Watkins wrote:
>>>>> Hey Greg,
>>>>>
>>>>>> On Sep 30, 2022, at 1:59 AM, Greg KH <gregkh at linuxfoundation.org> wrote:
>>>>>>
>>>>>> On Fri, Sep 30, 2022 at 06:37:48AM +0200, Greg KH wrote:
>>>>>>> On Thu, Sep 29, 2022 at 10:26:25PM -0400, Jerry Ling wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> It has been reported by multiple users across a handful of distros
>>>>>>>> that
>>>>>>>> there seems to be regression on Framework laptop (which presumably
>>>>>>>> is not
>>>>>>>> that special in terms of mobo and display)
>>>>>>>>
>>>>>>>> Ref:
>>>>>>>> https://community.frame.work/t/psa-dont-upgrade-to-linux-kernel-5-19-12-arch1-1-on-arch-linux-gen-11-model/23171
>>>>>>> Can anyone do a 'git bisect' to find the offending commit?
>>>>>> Also, this works for me on a gen 12 framework laptop:
>>>>>>     $ uname -a
>>>>>>     Linux frame 5.19.12 #68 SMP PREEMPT_DYNAMIC Fri Sep 30 07:02:33
>>>>>> CEST 2022 x86_64 GNU/Linux
>>>>>>
>>>>>> so there's something odd with the older hardware?
>>>>>>
>>>>>> greg k-h
>>>>> Could be. Running git bisect for 5.19.11 and 5.19.12 (as suggested by
>>>>> the linked forum thread) returned nothing on gen 11 for me.
>>>>>
>>>>> This is very odd,
>>>>> -srw
>>>>
>>>>
>>
>> -- 
>> Ville Syrjälä
>> Intel
>