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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 10 Jan 2022 17:28:48 -0800
Message-ID: <CAHk-=wj9EQdO=gdgrajp03xNf6dtcE03oYucXmJJst0GgSs=VA@mail.gmail.com>
Subject: Re: [git pull] drm for 5.17-rc1 (pre-merge window pull)
To:     Alex Deucher <alexdeucher@gmail.com>
Cc:     Daniel Vetter <daniel.vetter@ffwll.ch>,
        "Wentland, Harry" <harry.wentland@amd.com>,
        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 5:21 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> It also seems to depend a bit on the screen contents - or possibly on
> what else is going on. Hiding the browser window makes it happen less,
> I think. But I suspect that's about "less gpu activity" than anything
> else.

Actually, sometimes "more activity" makes it go away too. Moving a
window around wildly with the mouse makes it *stop* happen.

But moving the mouse over different elements of the screen - or
writing text in the web browser email window - seems to make it worse.

Funky.

It does "feel" to me like some bandwidth limitation, it has kind of
the same behavior that I remember from the bad old times when you were
pushing the video card past a resolution that it could really handle.

But that can't be the case, this card has had no problems with this before.

               Linus