Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement

From	Maxime Ripard <mripard@kernel.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement
Date	2025-08-27 12:10 +0200
Message-ID	<Lolgl-aJ9q-1@gated-at.bofh.it> (permalink)
References	(2 earlier) <L7Lqy-h7oT-9@gated-at.bofh.it> <LdsOd-3mlZ-1@gated-at.bofh.it> <LnJ1n-ai3o-1@gated-at.bofh.it> <GtScV-7V49-1@gated-at.bofh.it> <LnJ1n-ai3o-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On Mon, Aug 25, 2025 at 05:11:24PM +0000, James Addison wrote:
> Thanks, Maxime.
> 
> On Mon, 28 Jul 2025 at 09:47, Maxime Ripard <mripard@kernel.org> wrote:
> >
> > Hi,
> >
> > On Sat, Jul 12, 2025 at 06:32:53PM +0200, Ben Hutchings wrote:
> > [...]
> > > [...]
> > >
> > > Looking at the previous posting of this patch upstream, it was not clear
> > > to me why the patch wasn't applied.  Maxime, do you know what happened?
> > >
> > > Would it be worth submitting James's updated patch as a v3?
> >
> > If I remember well, my series was considered a workaround to a bug
> > triggered by an obsolete mechanism in the kernel.
> >
> > So it was advocated that we should get rid of that mechanism instead,
> > and thus this series would be made irrelevant. However, removing that
> > mechanism triggered a few regressions in some drivers, so it never went
> > through, and my series was forgotten about.
> >
> > It's been in limbo ever since.
> 
> Is that potential cleanup related to the legacy cursor update
> mechanism?  The reason I ask: I found a LKML thread from Feb 2023
> about that, and it mentions some MSM (Adreno?) regressions.
> 
> (I'm not hyperlinking to it yet though, in case I'm on the wrong track)

Yes, it is
https://lore.kernel.org/dri-devel/20220331152021.2671937-1-daniel.vetter@ffwll.ch/#t

I've ping'd the msm maintainers after sending that mail, I'll try again
once the holiday season is over.

Maxime

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Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement James Addison <jay@jp-hosting.net> - 2025-04-29 12:50 +0200
  Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement Ben Hutchings <ben@decadent.org.uk> - 2025-07-12 18:40 +0200
    Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement Maxime Ripard <mripard@kernel.org> - 2025-07-28 12:00 +0200
      Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement James Addison <jay@jp-hosting.net> - 2025-08-25 19:20 +0200
        Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mouse movement Maxime Ripard <mripard@kernel.org> - 2025-08-27 12:10 +0200

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