[Bug 97980] [amdgpu] New kernel warning during shutdown

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97980

--- Comment #5 from Andy Furniss <adf.lists at gmail.com> ---
Maybe a different issue but I've just started getting shutdown issues with
agd5f drm-next-4.9-wip

It seems the monitor blanks early so I don't get to see anything - just with
halt it doesn't power off.

On current kernel reverting 

0ea8cba5ef7b783f11cb1a0b900b7c18d2ce0b6
drm/amdgpu: always apply pci shutdown callbacks (v2)

Apparently fixes it, but it's not that simple. I first saw the issue on the
25th, but with the next update the branch got it went away, so I thought it was
fixed. It re-appeared with more recent updates.

Unfortunately it seems the my working recent kernel (26th) has the above commit
- so maybe some interaction/timing issue with something else.

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