[Bug 93073] New: 1002:68a0 After suspend-resume graphics are sluggish and input lags with displayport connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93073

            Bug ID: 93073
           Summary: 1002:68a0 After suspend-resume graphics are sluggish
                    and input lags with displayport connected
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: bugs.freedesktop at nexigon.net
        QA Contact: xorg-team at lists.x.org

Created attachment 120039
  --> https://bugs.freedesktop.org/attachment.cgi?id=120039&action=edit
Bisect log

As reported at Launchpad:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1515776

and to mailinglist:
http://marc.info/?l=dri-devel&m=144780894513907

After resuming from suspend-to-ram, graphics on displayport connected Dell
U2415 monitor are sluggish and input has lag.
Examples:
- transition from unity greeter login locked status to unlocked status: 6
seconds (normal 1 second)
- transition from clicking dash and getting window: 2-3 seconds (normal <1
second)
- starting gedit: 4 seconds (normal <1 second)
- mouse lags, sometimes the pointer is still on the left side of the screen,
while it should be on the right
- input from keyboard lags, about 1-2 seconds (normal no lag)

When unplugging the Displayport cable all lag is gone.

When plugging displayport back in again lag is back, same as before.

After a reboot, response of graphics and input is normal. So two options to get
rid of the lag: unplug DP or reboot.

Further investigation:
Did a mainline kernel bisect:
>From 3.13.11-ckt27 (good) to v4.3-wily (bad)
First bad is v4.0-rc1-vivid
Did a kernel commit bisect:
>From 3.19 (good) to 4.0-rc1 (bad)
first bad commit: [e55bca26188e45f209597abf986c87cc5a49894a] radeon/audio:
enable DP audio

Commit bisect log is attached

WORKAROUND: radeon.audio=0
However, I'm not able to use audio over Displayport.

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