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<body><span class="vcard"><a class="email" href="mailto:mmokrejs@gmail.com" title="mmokrejs@fold.natur.cuni.cz <mmokrejs@gmail.com>"> <span class="fn">mmokrejs@fold.natur.cuni.cz</span></a>
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<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93055">bug 93055</a>
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<td>mmokrejs@gmail.com
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93055#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93055">bug 93055</a>
from <span class="vcard"><a class="email" href="mailto:mmokrejs@gmail.com" title="mmokrejs@fold.natur.cuni.cz <mmokrejs@gmail.com>"> <span class="fn">mmokrejs@fold.natur.cuni.cz</span></a>
</span></b>
<pre>I just hit this on vanilla 4.6.0, seems it was triggered when I offlined my
both emulated cores:
[ 2.735151] [drm] Initialized drm 1.1.0 20060810
[ 2.736925] [drm] DMAR active, disabling use of stolen memory
[ 2.737003] [drm] Memory usable by graphics device = 2048M
[ 2.737080] [drm] VT-d active for gfx access
[ 2.737155] [drm] Disabling PPGTT because VT-d is on
[ 2.737233] [drm] Replacing VGA console driver
[ 2.744655] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 2.744662] [drm] Driver supports precise vblank timestamp query.
[ 2.773463] [drm] Initialized i915 1.6.0 20160229 for 0000:00:02.0 on minor
0
[ 2.866014] fbcon: inteldrmfb (fb0) is primary device
[ 4.125844] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 165.797309] smpboot: CPU 2 is now offline
[ 166.026841] smpboot: CPU 3 is now offline
[ 183.364775] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
[ 183.365292] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[ 183.365302] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
A FIFO underrun
[ 183.380297] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 183.403654] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder B
This is Dell Vostro 3550 with i7-2640M, BIOS A12. However, I haven't realized
nay graphics output issue.</pre>
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