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<body><span class="vcard"><a class="email" href="mailto:behrangsa@gmail.com" title="Behrang Saeedzadeh <behrangsa@gmail.com>"> <span class="fn">Behrang Saeedzadeh</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][GLK] drm:intel_cpu_fifo_underrun_irq_handler [i915] *ERROR* CPU pipe B FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106538">bug 106538</a>
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<td>behrangsa@gmail.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][GLK] drm:intel_cpu_fifo_underrun_irq_handler [i915] *ERROR* CPU pipe B FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106538#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][GLK] drm:intel_cpu_fifo_underrun_irq_handler [i915] *ERROR* CPU pipe B FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106538">bug 106538</a>
from <span class="vcard"><a class="email" href="mailto:behrangsa@gmail.com" title="Behrang Saeedzadeh <behrangsa@gmail.com>"> <span class="fn">Behrang Saeedzadeh</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=144100" name="attach_144100" title="dmesg">attachment 144100</a> <a href="attachment.cgi?id=144100&action=edit" title="dmesg">[details]</a></span>
dmesg
I think this issue has been affecting me for a few years now but i just
recently started to look into it.
my current system is ubuntu 19.04 but this issue was present even when i was
using 18.04 and 18.10 and even before that.
os: ubuntu 19.04
cpu: intel core i7 6700
graphics (integrated only): hd graphics 530 (skylake gt2)
anyway, from time to time only one of my monitors turn on. when that happens
`dmesg | grep i915` prints this:
```
➜ ~ dmesg -e | grep i915
[ +0.000545] i915 0000:00:02.0: vgaarb: changed vga decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ +0.000627] [drm] finished loading dmc firmware i915/skl_dmc_ver1_27.bin
(v1.27)
[ +0.003052] [drm] initialized i915 1.6.0 20181204 for 0000:00:02.0 on minor 0
[ +0.000036] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
[ +0.000047] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ +0.249846] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *error* cpu pipe
a fifo underrun
➜ ~ dmesg -t | grep i915
[sat apr 27 17:47:08 2019] i915 0000:00:02.0: vgaarb: changed vga decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[sat apr 27 17:47:08 2019] [drm] finished loading dmc firmware
i915/skl_dmc_ver1_27.bin (v1.27)
[sat apr 27 17:47:09 2019] [drm] initialized i915 1.6.0 20181204 for
0000:00:02.0 on minor 0
[sat apr 27 17:47:09 2019] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
[sat apr 27 17:47:09 2019] i915 0000:00:02.0: fb0: inteldrmfb frame buffer
device
[sat apr 27 17:47:09 2019] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*error* cpu pipe a fifo underrun
```
when i switch to wayland, sometimes none of my monitors turn on at all. once
when both turned on, i turned off one
and tried to turn it back on again, but it went into energy saving mode. then
`dmesg` was showing this:
```
➜ ~ dmesg -t | grep i915
[sat apr 27 18:14:17 2019] i915 0000:00:02.0: vgaarb: changed vga decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[sat apr 27 18:14:17 2019] [drm] finished loading dmc firmware
i915/skl_dmc_ver1_27.bin (v1.27)
[sat apr 27 18:14:18 2019] [drm] initialized i915 1.6.0 20181204 for
0000:00:02.0 on minor 0
[sat apr 27 18:14:18 2019] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
[sat apr 27 18:14:18 2019] i915 0000:00:02.0: fb0: inteldrmfb frame buffer
device
[sat apr 27 18:14:56 2019] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*error* cpu pipe b fifo underrun
➜ ~ dmesg -e | grep i915
[ +0.000664] i915 0000:00:02.0: vgaarb: changed vga decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ +0.000861] [drm] finished loading dmc firmware i915/skl_dmc_ver1_27.bin
(v1.27)
[ +0.016298] [drm] initialized i915 1.6.0 20181204 for 0000:00:02.0 on minor 0
[ +0.000047] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
[ +0.000047] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ +23.689059] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *error* cpu pipe
b fifo underrun
```</pre>
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