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From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Tue, 5 Apr 2022 10:23:16 -0400
Message-ID: <CADnq5_PhaFbVCb=-AUCx4L-sCyPCPOsY3tNpiAg=gfCN7hFcJA@mail.gmail.com>
Subject: Re: AMDGPU: regression on 5.17.1
To:     Michele Ballabio <ballabio.m@gmail.com>
Cc:     LKML <linux-kernel@vger.kernel.org>, regressions@lists.linux.dev,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>
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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.

Thanks,

Alex


>
> Thanks,
>     Michele Ballabio