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

[Ville Syrjälä]

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

Also cc intel-gfx...

> 
> > 
> > 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

-- 
Ville Syrjälä
Intel