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

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Date:	Wed, 25 May 2016 12:42:44 +0300
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	sedat.dilek@...il.com, Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	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 Wed, 25 May 2016, 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
>
> Attached are my linux-config, dmesg-output anx Xorg-log.
>
> Any other informations you need?

For starters, please try the fixes pull I just sent on top [1]. There's
a couple of watermark fixes.

BR,
Jani.



[1] http://mid.gmane.org/87zirebjm7.fsf@intel.com



-- 
Jani Nikula, Intel Open Source Technology Center