linux-kernel - Re: [PATCH] i915: disable framebuffer compression on GeminiLake

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Date:   Thu, 9 May 2019 19:29:48 +0800
From:   Daniel Drake <drake@...lessm.com>
To:     Paulo Zanoni <paulo.r.zanoni@...el.com>
Cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jian-Hong Pan <jian-hong@...lessm.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        intel-gfx@...ts.freedesktop.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [PATCH] i915: disable framebuffer compression on GeminiLake

Hi,


On Thu, Apr 25, 2019 at 4:27 AM Paulo Zanoni <paulo.r.zanoni@...el.com> wrote:
>
> Em qua, 2019-04-24 às 20:58 +0100, Chris Wilson escreveu:
> > Quoting Jian-Hong Pan (2019-04-23 10:28:10)
> > > From: Daniel Drake <drake@...lessm.com>
> > >
> > > On many (all?) the Gemini Lake systems we work with, there is frequent
> > > momentary graphical corruption at the top of the screen, and it seems
> > > that disabling framebuffer compression can avoid this.
> > >
> > > The ticket was reported 6 months ago and has already affected a
> > > multitude of users, without any real progress being made. So, lets
> > > disable framebuffer compression on GeminiLake until a solution is found.
> > >
> > > Buglink: https://bugs.freedesktop.org/show_bug.cgi?id=108085
> > > Signed-off-by: Daniel Drake <drake@...lessm.com>
> > > Signed-off-by: Jian-Hong Pan <jian-hong@...lessm.com>
> >
> > Fixes: fd7d6c5c8f3e ("drm/i915: enable FBC on gen9+ too") ?
> > Cc: Paulo Zanoni <paulo.r.zanoni@...el.com>
> > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> > Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> > Cc: <stable@...r.kernel.org> # v4.11+
> >
> > glk landed 1 month before, so that seems the earliest broken point.
> >
>
> The bug is well reported, the bug author is helpful and it even has a
> description of "steps to reproduce" that looks very easy (although I
> didn't try it). Everything suggests this is a bug the display team
> could actually solve with not-so-many hours of debugging.
>
> In the meantime, unbreak the systems:
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@...el.com>

Quick ping here. Any further comments on this patch? Can it be applied?

Thanks
Daniel