linux-kernel - Re: Hibernation broken since commit 274ad65c9d02 ("drm/radeon: hard reset r600 and newer GPU when hibernating.")

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Message-ID: <871sziix31.fsf@turtle.gmx.de>
Date:   Fri, 14 Oct 2016 20:50:42 +0200
From:   Sven Joachim <svenjoac@....de>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     Alex Deucher <alexdeucher@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: Hibernation broken since commit 274ad65c9d02 ("drm/radeon: hard reset r600 and newer GPU when hibernating.")

On 2016-09-15 11:04 -0400, Jerome Glisse wrote:

>> On Mon, Sep 5, 2016 at 10:25 PM, Jerome Glisse <jglisse@...hat.com> wrote:
>> >> Recently I got myself a new laptop with the following integrated GPU:
>> >>
>> >> 00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
>> >> Mullins [Radeon R3 Graphics] (rev 40)
>> >>
>> >> I found that hibernation is broken in Linux 4.7+ (it works in Linux 4.6)
>> >> and bisected it to commit 274ad65c9d02 ("drm/radeon: hard reset r600 and
>> >> newer GPU when hibernating.").
>> >>
>> >> This has already been reported three months ago, but for a much older
>> >> GPU, see the thread starting at
>> >> https://lists.freedesktop.org/archives/dri-devel/2016-June/110050.html.
>> >> The symptoms are exactly the same as described by Boris Petkov in that
>> >> thread: after "systemctl hibernate" the screen goes blank, but the
>> >> machine remains powered on and needs to be power-cycled.
>> >>
>> >> Any suggestions would be welcome.
>> >>
>> >> Cheers,
>> >>        Sven
>> >
>> > I guess we can invert the logic and only do it for the GPU for which it fix
>> > hibernation.
>> 
>> Do you remember which asics this fixed?
>> 
>
> No that's the issue, i don't have hw anymore but according to bug it is AMD FirePro
> M5170 and M6170 which would make them amdgpu afaict but i remember the hw was using
> radeon so i am not sure how to figure out what GPU it was really.
>
> Bug https://bugzilla.redhat.com/show_bug.cgi?id=1269009

That bug is not public, unfortunately. :-(

Are there any news on this?  As of Linux 4.8.1, I keep reverting commit
274ad65c9d02, and I'd like not having to do that indefinitely.

Cheers,
       Sven