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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][HSW only] *ERROR* PCH transcoder A FIFO underrun | *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102614#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][HSW only] *ERROR* PCH transcoder A FIFO underrun | *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102614">bug 102614</a>
from <span class="vcard"><a class="email" href="mailto:marta.lofstedt@intel.com" title="Marta Löfstedt <marta.lofstedt@intel.com>"> <span class="fn">Marta Löfstedt</span></a>
</span></b>
<pre><a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3835/shard-hsw5/igt@kms_vblank@pipe-a-query-forked-busy-hang.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3835/shard-hsw5/igt@kms_vblank@pipe-a-query-forked-busy-hang.html</a>
from dmesg:
<7>[ 829.768537] missed_breadcrumb *
<7>[ 829.768549] missed_breadcrumb Idle? no
<7>[ 841.736597] [drm:i915_reset_device [i915]] resetting chip
<5>[ 841.736895] i915 0000:00:02.0: Resetting chip after gpu hang
<7>[ 841.737399] [drm:i915_gem_reset_engine [i915]] resetting rcs0 to restart
from tail of request 0x3
<7>[ 841.737992] [drm:sandybridge_pcode_read [i915]] warning: pcode (read from
mbox 5) mailbox access failed for intel_enable_gt_powersave [i915]: -6
<7>[ 841.738243] [drm:init_workarounds_ring [i915]] rcs0: Number of context
specific w/a: 0
...
<3>[ 841.840039] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
<3>[ 841.840280] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun</pre>
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