linux-kernel - Re: AMDGPU: regression on 5.17.1

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Date:   Mon, 4 Apr 2022 21:39:40 +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 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/ ?

Setting amdgpu.runpm=0 works, the display now unblanks without problems.

Thanks,
    Michele Ballabio