linux-kernel - Re: AMDGPU: regression on 5.17.1

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Message-ID: <20220409182831.185e5d92@darkstar.example.org>
Date:   Sat, 9 Apr 2022 18:28:31 +0200
From:   Michele Ballabio <ballabio.m@...il.com>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, regressions@...ts.linux.dev,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>
Subject: Re: AMDGPU: regression on 5.17.1

On Tue, 5 Apr 2022 10:23:16 -0400
Alex Deucher <alexdeucher@...il.com> wrote:

> On Mon, Apr 4, 2022 at 3:39 PM Michele Ballabio
> <ballabio.m@...il.com> wrote:
> >
> > On Mon, 4 Apr 2022 13:03:41 -0400
> > Alex Deucher <alexdeucher@...il.com> wrote:
> >
> > > On Sun, Apr 3, 2022 at 10:19 AM Michele Ballabio
> > > <ballabio.m@...il.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,
    Michele Ballabio