[Bug 94147] Sometimes Xorg freezes after dpms off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94147

            Bug ID: 94147
           Summary: Sometimes Xorg freezes after dpms off
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: ismo.toijala at gmail.com

Created attachment 121745
  --> https://bugs.freedesktop.org/attachment.cgi?id=121745&action=edit
journal output

Sometimes Xorg freezes when the screens are turned off (from idle or manually
with xset dpms off). The rest of the machine keeps working. The X server no
longer accepts input and does not turn on the screens.

Hardware: 5650M + Intel 460M (muxed)
Software:
- Linux 4.3+ (not happening on 4.2.4 and older)
- xorg-server 1.18.1
- xf86-video-ati 7.6.1
- xf86-video-intel 2.99.917+519+g8229390

I could try to bisect but reproducing for every version would be very time
consuming, since the bu does not happen every time.

I think it only happens if the screens are off for a long time (15 min+?).

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