[Bug 104168] [KBLR] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104168

Behrang Saeedzadeh <behrangsa at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|CLOSED                      |REOPENED
         Resolution|NOTOURBUG                   |---

--- Comment #7 from Behrang Saeedzadeh <behrangsa at gmail.com> ---
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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