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Re: [Intel-gfx] [v4.6-10530-g28165ec7a99b] i915: *ERROR* "CPU pipe/PCH transcoder" A FIFO underrun

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  Re: [Intel-gfx] [v4.6-10530-g28165ec7a99b] i915: *ERROR* "CPU  pipe/PCH transcoder" A FIFO underrun Chris Bainbridge <chris.bainbridge@gmail.com> - 2016-05-27 10:20 +0200
    Re: [Intel-gfx] [v4.6-10530-g28165ec7a99b] i915: *ERROR* "CPU  pipe/PCH transcoder" A FIFO underrun Sedat Dilek <sedat.dilek@gmail.com> - 2016-05-28 10:00 +0200
    Re: [Intel-gfx] [v4.6-10530-g28165ec7a99b] i915: *ERROR* "CPU  pipe/PCH transcoder" A FIFO underrun Sedat Dilek <sedat.dilek@gmail.com> - 2016-05-30 23:10 +0200

#1407907 — Re: [Intel-gfx] [v4.6-10530-g28165ec7a99b] i915: *ERROR* "CPU pipe/PCH transcoder" A FIFO underrun

On 25 May 2016 at 08:31, Sedat Dilek <sedat.dilek@gmail.com> wrote:
> Hi Daniel,
>
> with latest Linus Git I see this with my Intel SandyBridge GPU...
>
> [   17.629014] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
> *ERROR* CPU pipe A FIFO underrun
> [   17.630652] [drm:intel_set_pch_fifo_underrun_reporting [i915]]
> *ERROR* uncleared pch fifo underrun on pch transcoder A
> [   17.630685] [drm:intel_pch_fifo_underrun_irq_handler [i915]]
> *ERROR* PCH transcoder A FIFO underrun

Guessing this is https://bugs.freedesktop.org/show_bug.cgi?id=95736

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#1408389

On 5/27/16, Chris Bainbridge <chris.bainbridge@gmail.com> wrote:
> On 25 May 2016 at 08:31, Sedat Dilek <sedat.dilek@gmail.com> wrote:
>> Hi Daniel,
>>
>> with latest Linus Git I see this with my Intel SandyBridge GPU...
>>
>> [   17.629014] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
>> *ERROR* CPU pipe A FIFO underrun
>> [   17.630652] [drm:intel_set_pch_fifo_underrun_reporting [i915]]
>> *ERROR* uncleared pch fifo underrun on pch transcoder A
>> [   17.630685] [drm:intel_pch_fifo_underrun_irq_handler [i915]]
>> *ERROR* PCH transcoder A FIFO underrun
>
> Guessing this is https://bugs.freedesktop.org/show_bug.cgi?id=95736
>

Thanks for the hint!

Did you try with reverting this "first bad" commit mentionned in your
BR (or a "series of commits")?

- Sedat -

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#1409448

On 5/28/16, Sedat Dilek <sedat.dilek@gmail.com> wrote:
> On 5/27/16, Chris Bainbridge <chris.bainbridge@gmail.com> wrote:
>> On 25 May 2016 at 08:31, Sedat Dilek <sedat.dilek@gmail.com> wrote:
>>> Hi Daniel,
>>>
>>> with latest Linus Git I see this with my Intel SandyBridge GPU...
>>>
>>> [   17.629014] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
>>> *ERROR* CPU pipe A FIFO underrun
>>> [   17.630652] [drm:intel_set_pch_fifo_underrun_reporting [i915]]
>>> *ERROR* uncleared pch fifo underrun on pch transcoder A
>>> [   17.630685] [drm:intel_pch_fifo_underrun_irq_handler [i915]]
>>> *ERROR* PCH transcoder A FIFO underrun
>>
>> Guessing this is https://bugs.freedesktop.org/show_bug.cgi?id=95736
>>
>
> I did some last testing (for this weekend) with drm-intel-nightly
> (2016y-05m-27d-12h-32m-45s UTC) on top of Linux v4.6 final.
>
> This did not help as I see the same *ERROR* outputs.
>

With drm-intel-nightly (2016y-05m-30d-17h-51m-33s-UTC) the outputs
look a bit different and more helpful?

[   19.139790] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe A FIFO underrun
[   19.140274] [drm:intel_set_pch_fifo_underrun_reporting [i915]]
*ERROR* uncleared pch fifo underrun on pch transcoder A
[   19.140299] [drm:intel_pch_fifo_underrun_irq_handler [i915]]
*ERROR* PCH transcoder A FIFO underrun

- Sedat -

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