[Bug 103641] New: Resume to black screen, Radeon HD 5750 on DP

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=103641

            Bug ID: 103641
           Summary: Resume to black screen, Radeon HD 5750 on DP
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.0+
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: jimmy.kloss at gmail.com
        Regression: No

When resuming from suspend-to-ram the DisplayPort does not come back The
monitor says 'No Signal', only a reboot brings the DP video output back to
live. The HDMI output is unaffected.

I assumed this happened while enabling DP Audio on radeon.

Now I bisected from v3.19 to v4.0

e55bca26188e45f209597abf986c87cc5a49894a is the first bad commit
commit e55bca26188e45f209597abf986c87cc5a49894a
Author: Slava Grigorev <slava.grigorev at amd.com>
Date:   Fri Dec 12 17:01:42 2014 -0500

    radeon/audio: enable DP audio

    Reviewed-by: Christian König <christian.koenig at amd.com>
    Signed-off-by: Slava Grigorev <slava.grigorev at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 25da4481f28d249ec827fe72c0b14c0a50265887
2eb7eb3728a5b811b0f954cbce486841c90ef938 M      drivers

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