Re: [BUG/REGRESSION] Screen flickering

Sudip Mukherjee
2015-05-13T10:32:25Z

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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