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

[Jerome Glisse]

> On Mon, Sep 5, 2016 at 10:25 PM, Jerome Glisse <jglisse at redhat.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

Cheers,
Jérôme