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

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Date:   Thu, 09 May 2019 15:33:12 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Daniel Drake <drake@...lessm.com>,
        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>,
        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

On Thu, 09 May 2019, Daniel Drake <drake@...lessm.com> wrote:
> 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?

Pushed now, thanks. Needed to get a clean CI result, and I dropped the
ball a bit there, sorry.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center