[Bug 86548] New: Screen tears on xrandr orientation inverted

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86548

            Bug ID: 86548
           Summary: Screen tears on xrandr orientation inverted
           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: jeff at deserettechnology.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 109827
  --> https://bugs.freedesktop.org/attachment.cgi?id=109827&action=edit
screenshot of tearing effect

When xrandr -o inverted is run, the resulting image is split down the middle.
This happens 95% of the time; it has worked once or twice without tearing.
Rotation can be activated through unity-control-center Display Settings
rotation field, and that reliably works fine. When xrandr -o normal is run, the
display returns to normal (although bug #1376760 is observed). xrandr -o right
and xrandr -o left also reliably work without issue; this only occurs on xrandr
-o inverted. The same behaviors are observed with the longer form of the
command xrandr --output eDP1 --rotation inverted, etc.

This has also been reported at https://github.com/pfps/yoga-laptop/issues/28,
which uses xrandr commands to invert the display.

See also Launchpad:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1395182

lspci:

00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT
Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA
controller])

Screenshot attached.

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