[Bug 96180] New: TearFree is lost after switching output monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96180

            Bug ID: 96180
           Summary: TearFree is lost after switching output monitors
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: mkj at gotu.dk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

I'm running latest Debian Stretch on a ThinkPad X1 Carbon 20A7, sometimes
attached to a dock.

When detaching or attaching my dock with a DP monitor attached, my video output
gets teared. I saw this in the attached Xorg.0.log:

[   807.026] (II) intel(0): switch to mode 2560x1440 at 60.0 on DP2-2 using pipe
1, position (0, 0), rotation normal, reflection none
[  1123.133] (EE) intel(0): Failed to prepare CRTC for page flipping, disabling
TearFree
[  1123.690] (II) intel(0): switch to mode 2560x1440 at 60.0 on eDP1 using pipe 0,
position (0, 0), rotation normal, reflection none
[  1123.986] (EE) intel(0): Failed to prepare CRTC for page flipping, disabling
TearFree
[  1123.991] (II) intel(0): Disabled output DP2-1
[  1123.991] (II) intel(0): Disabled output DP2-2
[  1123.991] (II) intel(0): Disabled output DP2-3
[ 11204.479] (II) intel(0): Enabled output DP2-1
[ 11204.479] (II) intel(0): Enabled output DP2-2
[ 11204.479] (II) intel(0): Enabled output DP2-3


Any ideas?

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