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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #5 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
Created attachment 123827
  --> https://bugs.freedesktop.org/attachment.cgi?id=123827&action=edit
dmesg-drm-full

Corresponding dmesg log

`xrandr --output eDP1 --mode 2560x1600 --scale-from 1280x800` executed at [
875.16 ]


After that logged errors are:

[  875.927050] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe B
[  875.927060] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C
[  875.927069] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B

[  875.937153] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe B
[  875.937156] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C
[  875.937165] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B

[  875.950244] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C

[  876.503832] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe B
[  876.503836] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C
[  876.503844] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B

[  876.546722] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe B
[  876.546726] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C
[  876.546734] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B
[  876.546740] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder C

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