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Groups > linux.debian.kernel > #88574

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

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Hi,

On Sat, Jul 12, 2025 at 06:32:53PM +0200, Ben Hutchings wrote:
> Hi all,
> 
> On Tue, 2025-04-29 at 10:40 +0000, James Addison wrote:
> > Control: tags -1 patch
> > 
> > Hi Diederik, Maxime,
> > 
> > On Wed, 10 May 2023 19:20:45 +0200, Diederik wrote:
> > > Control: forwarded -1 https://lore.kernel.org/all/20230127-rpi-cursor-corruption-v2-1-1f97bd00df01@cerno.tech/
> > 
> > I've found the time to test Maxime's vc4 dlist deferral patch -- with
> > minor adjustments to rebase against Debian's 6.12.22-1 kernel -- on an
> > rpi400 machine locally.
> > 
> > From testing two side-by-side kernel builds, one with the patch
> > applied, and one without it, I can attest that the patch does indeed
> > resolve the reported cursor/video speckling problem when using the
> > mini-HDMI port most-distant from the USB-C power port.
> [...]
> 
> 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.

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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