[Bug 192271] New: kernel 4.9 hangs during shutdown or reboot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=192271

            Bug ID: 192271
           Summary: kernel 4.9 hangs during shutdown or reboot
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.9.2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: upcwtenq at emltmp.com
        Regression: No

After upgrading to kernel 4.9 my machine hangs during shutdown/reboot.
the shutdown/reboot procedure starts and finish with systemd unmount all
partitions.
Monitor poweroff but the gpu led (motherboard) is ON.

add "radeon.dpm=0" in kernel line solved problem.

vga: HD5770 Vapor-X (Evergreen)

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