linux-kernel - Re: [BUG/REGRESSION] Screen flickering

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Date:	Wed, 13 May 2015 13:10:11 +0200
From:	Jan Niehusmann <jan@...dor.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Jani Nikula <jani.nikula@...ux.intel.com>,
	Thomas Gummerer <t.gummerer@...il.com>,
	dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
	Michael Leuchtenburg <michael@...shhome.org>,
	Matt Roper <matthew.d.roper@...el.com>
Subject: Re: [BUG/REGRESSION] Screen flickering

On Wed, May 13, 2015 at 04:02:25PM +0530, Sudip Mukherjee wrote:
> > What I'm missing in the report, are some log entries I'm seeing on my
> > notebook:
> > 
> > Apr 30 08:50:23 localhost kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
> > Apr 30 08:50:23 localhost kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
> > Apr 30 08:50:29 localhost kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
> > Apr 30 08:50:29 localhost kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
> hi,
> I also have the similar entries in my dmesg, though my problem is a
> little different from yours and my bisect lead to another commit.
> And that also is still not fixed (last tested with 4.0).

(Please note that I didn't do a bisect - that was Thomas. I only noted
that I can confirm his observations and that his patch helps to prevent
or hide the issue.)

Perhaps these are two completely unrelated issues?

Jan

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