[Bug 74102] [ILK/SNB/IVB/HSW/BDW]igt/testdisplay causes *ERROR* Pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74102

--- Comment #18 from xubin <bin.a.xu at intel.com> ---
Tested on HSW mobile with drm-intel-testing-2015-04-10 kernel,the issue still
exist.

Reproduce steps:
-------------------------
1. ./testdisplay

output;
[root at x-hswm24 tests]# dmesg | grep ERROR
[  306.840212] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  306.840224] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  311.913628] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  311.913638] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  317.003005] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  317.003016] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  322.091233] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  322.091245] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  327.170122] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  327.170133] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  332.235159] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  332.235171] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  337.315396] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  337.315408] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  342.388604] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  342.388615] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  347.477507] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  347.477518] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  352.554282] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  352.554293] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  357.628327] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  357.628338] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  362.700255] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[  362.700267] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
[  367.778193] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A

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