---------- Forwarded message ---------
From: 678 <email address hidden>
Date: Sat, Mar 2, 2019 at 10:11 AM
Subject: Re: [Bug 1550779] Re: [Lenovo ThinkPad X220] *ERROR* CPU pipe A
FIFO underrun - Xorg glitches
To: Bug 1550779 <email address hidden>



On 02/03/19 12:40 AM, Tom Mittelstaedt wrote:
> complement (sorry for multiple-comments):
>
>
> $ dmesg | grep i915
> [    1.439662] i915 0000:00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
> [    1.439938] [drm] Finished loading DMC firmware
i915/skl_dmc_ver1_27.bin (v1.27)
> [    1.443269] [drm] Initialized i915 1.6.0 20180514 for 0000:00:02.0 on
minor 0
> [    1.523397] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
> [   15.764955] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
> [56162.413053] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [59291.355801] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [64022.043888] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [68572.684020] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [84907.749926] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [131695.137832] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [140974.062510] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [152485.446459] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [155522.518586] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [164965.550908] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [165879.406055] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [178549.854547] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [185381.350517] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [187311.834886] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [188858.938318] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [195515.961747] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [195618.444271] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [206235.029303] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [217208.530378] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [222859.639505] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [225820.223051] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [231471.431276] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [239098.879129] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [242398.343295] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [247190.079036] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [247912.015060] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [248846.631100] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
> [258283.737675] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
>
>
> Of course everything is up to date.

> Yes thank for the observation

<email address hidden>

But may I add and hope you are talking about my system , I am using a
Dell lap top purchased during 2006 with (bio date not remembered yet
,and later the bio date status changed without my knowledge, some time
back). I am not a tech/ expert ,but experiment with all type linux and
different flavors of  ubuntu .What I know is bios not reboot
automatically ,every time i open system, i have to reset bio. The system
has very severe remote interference and do not have a stable status.

Becasue of my driving experience (ignorant certainly),  I manage some
how this desktop and run things.:-)