[Bug 106538] [CI][GLK] drm:intel_cpu_fifo_underrun_irq_handler [i915] *ERROR* CPU pipe B FIFO underrun
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Sat Apr 27 08:33:55 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=106538
Behrang Saeedzadeh <behrangsa at gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |behrangsa at gmail.com
--- Comment #4 from Behrang Saeedzadeh <behrangsa at gmail.com> ---
Created attachment 144100
--> https://bugs.freedesktop.org/attachment.cgi?id=144100&action=edit
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
```
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