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

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Date:	Wed, 13 May 2015 11:53:19 +0200
From:	Jan Niehusmann <jan@...dor.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>
Cc:	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

Hi,

On Wed, May 13, 2015 at 12:14:39PM +0300, Jani Nikula wrote:
> Is this the same as https://bugzilla.kernel.org/show_bug.cgi?id=98141 ?

The visible effect in the video is similar to what I see on the LVDS
display. I also see some influence of the mouse pointer position on the
blanked areas.

The effect on the external screen is more like single scan
lines jumping to the right and back, at a high (but still visible)
frequency.

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

Jan

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