[Bug 93802] [IVB bisected] switching to tty1 causes fifo underrun on pipe B and pipe C

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93802

--- Comment #1 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
Shutdown log shows all pipes overflow when Xorg exits:


[ 1015.463379] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe A
[ 1015.463386] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
[ 1015.463400] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[ 1015.463403] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
A FIFO underrun
[ 1015.572966] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe B
[ 1015.572967] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C
[ 1015.572970] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B
[ 1015.572973] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder C
[ 1015.582403] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe B
[ 1015.582405] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C
[ 1015.582411] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B
[ 1015.582415] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder C
[ 1015.593548] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on
pipe C
[ 1015.593553] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder C

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