[Bug 95360] New: [IVB] xrandr eDP1 scale-from hangs with external displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95360

            Bug ID: 95360
           Summary: [IVB] xrandr eDP1 scale-from hangs with external
                    displays
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: chris.bainbridge at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

With two external DP rotated displays enabled, turning on eDP1:

$ xrandr --output eDP1 --mode 2560x1600 --scale-from 1280x800

Results in:

[  5718.080] (II) intel(0): resizing framebuffer to 2100x1680
[  5721.746] (II) intel(0): switch to mode 2560x1600 at 60.0 on eDP1 using pipe 2,
position (0, 0), rotation normal, reflection none
[  5721.997] (EE) intel(0): Page flipping failed, disabling TearFree

Seems hung - windows are still updated but there is no response to mouse or
keyboard.
Scaling works ok with only eDP1 (no external displays).

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