[Bug 98200] [radeon] kernel hangs during shutdown - drm-next-4.9-/+wip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98200

            Bug ID: 98200
           Summary: [radeon] kernel hangs during shutdown -
                    drm-next-4.9-/+wip
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: arek.rusi at gmail.com

Created attachment 127199
  --> https://bugs.freedesktop.org/attachment.cgi?id=127199&action=edit
panic_msg

Hi, 
I cannot restart or shutdown my PC since 26th or 27th sep. When I init
poweroff/restart always off with black screen, nothing happened.. I can only
press power or restart button.

When I start with radeon as second GPU, PC hangs on shutdown anyway but now i
can see on screen kernel panic msg. 


after reverted commit[1] everything works as before. 
[1]
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-4.9&id=a481daa88fd4d6b54f25348972bba10b5f6a84d0

I've only tested with next-drm-4.9 & -wip

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