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From:   Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Mon, 10 Jan 2022 23:04:46 +0100
Message-ID: <CAKMK7uEag=v-g6ygHPcT-uQJJx+5KOh2ZRzC2QtM-MCjjW67TA@mail.gmail.com>
Subject: Re: [git pull] drm for 5.17-rc1 (pre-merge window pull)
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Alex Deucher <alexdeucher@gmail.com>,
        "Wentland, Harry" <harry.wentland@amd.com>
Cc:     Dave Airlie <airlied@gmail.com>,
        "Koenig, Christian" <christian.koenig@amd.com>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>
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On Mon, Jan 10, 2022 at 10:30 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> On Thu, Jan 6, 2022 at 10:12 PM Dave Airlie <airlied@gmail.com> wrote:
> >
> >   git://anongit.freedesktop.org/drm/drm tags/drm-next-2022-01-07
>
> Gaah. I merged things and it built cleanly, and I pushed it out.
>
> But then I actually *booted* it, and that's not pretty.
>
> It *works", but it's almost unusable because of random scanline
> flickering.  I'm not sure how to explain it, but it's as if there
> wasn't quite enough bandwidth on the scan-out, so you get these lines
> of noise and/or shifted output. They are temporary - so the
> framebuffer contents themselves is not damaged (although I don't know
> how the compositor works - maybe the problem happens before scanout).
>
> This is on the same Radeon device:
>
>    49:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
> [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7)
>
> with dual 4k monitors.
>
> Any idea?

Since Christian is mostly the compute/memory side, adding some display
folks for this.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch