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    SubjectRe: AMDGPU: regression on 5.17.1
    On Wed, 13 Apr 2022 14:14:42 -0400
    Alex Deucher <alexdeucher@gmail.com> wrote:

    > On Wed, Apr 13, 2022 at 1:33 PM Michele Ballabio
    > <ballabio.m@gmail.com> wrote:
    > >
    > > On Mon, 11 Apr 2022 14:34:37 -0400
    > > Alex Deucher <alexdeucher@gmail.com> wrote:
    > >
    > > > On Sat, Apr 9, 2022 at 12:28 PM Michele Ballabio
    > > > <ballabio.m@gmail.com> wrote:
    > > > >
    > > > > On Tue, 5 Apr 2022 10:23:16 -0400
    > > > > Alex Deucher <alexdeucher@gmail.com> wrote:
    > > > >
    > > > > > On Mon, Apr 4, 2022 at 3:39 PM Michele Ballabio
    > > > > > <ballabio.m@gmail.com> wrote:
    > > > > > >
    > > > > > > On Mon, 4 Apr 2022 13:03:41 -0400
    > > > > > > Alex Deucher <alexdeucher@gmail.com> wrote:
    > > > > > >
    > > > > > > > On Sun, Apr 3, 2022 at 10:19 AM Michele Ballabio
    > > > > > > > <ballabio.m@gmail.com> wrote:
    > > > > > > > >
    > > > > > > > > Hi,
    > > > > > > > > I've hit a regression on 5.17.1 (haven't tested
    > > > > > > > > 5.17.0, but 5.16-stable didn't have this problem).
    > > > > > > > >
    > > > > > > > > The machine is a Ryzen 5 1600 with AMD graphics (RX
    > > > > > > > > 560).
    > > > > > > > >
    > > > > > > > > The regression I hit seems to trigger when the machine
    > > > > > > > > is left idle at boot (I don't boot straight to X, I
    > > > > > > > > boot to a tty, login and then start X). The machine
    > > > > > > > > after a while blanks the screen. Usually, the screen
    > > > > > > > > unblanks as the keyboard is hit or the mouse moves, but
    > > > > > > > > with kernel 5.17.1 the screen does not wake up. The
    > > > > > > > > machine seems to run mostly fine: I can login from ssh,
    > > > > > > > > but I cannot reboot or halt it: a sysrq sequence is
    > > > > > > > > needed for that. Note that if the screen goes blank
    > > > > > > > > under X, it wakes up fine.
    > > > > > > > >
    > > > > > > > > Below a dmesg and two traces from syslog (they're quite
    > > > > > > > > similar).
    > > > > > > >
    > > > > > > > Can you bisect? Does setting amdgpu.runpm=0 help?
    > > > > > >
    > > > > > > I can try to bisect, should I narrow the search to
    > > > > > > drivers/gpu/drm/ ?
    > > > > >
    > > > > > I would just do a full bisect if possible in case the change
    > > > > > happens to be outside of drm.
    > > > > >
    > > > > > >
    > > > > > > Setting amdgpu.runpm=0 works, the display now unblanks
    > > > > > > without problems.
    > > > > >
    > > > >
    > > > > Hi,
    > > > > I bisected this, and the first bad commit is
    > > > > [087451f372bf76d971184caa258807b7c35aac8f] drm/amdgpu: use
    > > > > generic fb helpers instead of setting up AMD own's.
    > > > >
    > > > > Let me know if you need some more testing.
    > > >
    > > > Thanks. Do the attached patches fix the issue?
    > > >
    > > > Thanks,
    > > >
    > > > Alex
    > >
    > > Sorry, no. I applied them both on top of 5.17.1.
    >
    > Thanks. Please try the attached patch.
    >
    > Thanks,
    >
    > Alex

    I applied the v2 patch on top of 5.17.1 and it works as expected.

    Tested-by: Michele Ballabio <ballabio.m@gmail.com>

    Thanks,
    Michele Ballabio

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