Date: Wed, 13 May 2015 16:02:25 +0530
From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
To: Jan Niehusmann <jan@gondor.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>,
        Thomas Gummerer <t.gummerer@gmail.com>,
        dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@intel.com>,
        Michael Leuchtenburg <michael@slashhome.org>,
        Matt Roper <matthew.d.roper@intel.com>
Subject: Re: [BUG/REGRESSION] Screen flickering
Message-ID: <20150513103224.GA8470@sudip-PC>
References: <87pp65efmo.fsf@hank.tgummerer.com>
 <87iobw3klc.fsf@intel.com>
 <20150513095319.GA4249@jannic.reliablesolutions.de>
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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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