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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ILK/SNB/IVB/HSW/BDW]igt/testdisplay causes *ERROR* Pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74102#c18">Comment # 18</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [ILK/SNB/IVB/HSW/BDW]igt/testdisplay causes *ERROR* Pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74102">bug 74102</a>
from <span class="vcard"><a class="email" href="mailto:bin.a.xu@intel.com" title="xubin <bin.a.xu@intel.com>"> <span class="fn">xubin</span></a>
</span></b>
<pre>Tested on HSW mobile with drm-intel-testing-2015-04-10 kernel,the issue still
exist.
Reproduce steps:
-------------------------
1. ./testdisplay
output;
[root@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</pre>
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