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

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Date:	Wed, 13 May 2015 16:02:25 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Jan Niehusmann <jan@...dor.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 11:53:19AM +0200, Jan Niehusmann wrote:
> 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
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).

http://patchwork.freedesktop.org/patch/46071/

regards
sudip


> 
> Jan
> 
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