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

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Date:	Mon, 30 May 2016 23:07:01 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Chris Bainbridge <chris.bainbridge@...il.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] [v4.6-10530-g28165ec7a99b] i915: *ERROR* "CPU
 pipe/PCH transcoder" A FIFO underrun

On 5/28/16, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On 5/27/16, Chris Bainbridge <chris.bainbridge@...il.com> wrote:
>> On 25 May 2016 at 08:31, Sedat Dilek <sedat.dilek@...il.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 -