[Bug 99524] kernel hangs during shutdown (similar to Bug 98200)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99524

            Bug ID: 99524
           Summary: kernel hangs during shutdown (similar to Bug 98200)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: 10dmar10 at gmail.com

Created attachment 129131
  --> https://bugs.freedesktop.org/attachment.cgi?id=129131&action=edit
serial terminal capture (power on, login, shutdown)

Hi,

this bug is similar to Bug 98200.

Since upgrade from kernel 4.8.17 to 4.9.{1,2,5} I am unable to restart or
shutdown my PC. 
Poweroff/restart always ends with black screen (display shows "no signal"). 
System stays frozen with fans / hard discs spinning. 
Reset button does not bring the system back - it stays completely frozen.
Only manual (power button) power off/on cycle brings the system back.

GPU: [AMD/ATI] Juniper XT [Radeon HD 5770]

I was able to capture kernel messages over serial line, last lines:

...
[  136.326236] systemd-shutdown[1]: All loop devices detached.
[  136.353887] kvm: exiting hardware virtualization
[  136.380090] Console: switching to colour VGA+ 80x25
[  136.406675] [drm] radeon: finishing device.  

I tested kernel 4.9.1, 4.9.2 and 4.9.5.

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