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<body><span class="vcard"><a class="email" href="mailto:yann.argotti@intel.com" title="yann <yann.argotti@intel.com>"> <span class="fn">yann</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] [regression] Flickering artefact window at top left of screens in kernel 4.8-rc5"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97596">bug 97596</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">i915 platform</td>
<td>
</td>
<td>SKL
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<td style="text-align:right;">i915 features</td>
<td>
</td>
<td>display/watermark
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</tr></table>
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] [regression] Flickering artefact window at top left of screens in kernel 4.8-rc5"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97596#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] [regression] Flickering artefact window at top left of screens in kernel 4.8-rc5"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97596">bug 97596</a>
from <span class="vcard"><a class="email" href="mailto:yann.argotti@intel.com" title="yann <yann.argotti@intel.com>"> <span class="fn">yann</span></a>
</span></b>
<pre>(In reply to rockorequin from <a href="show_bug.cgi?id=97596#c0">comment #0</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=126212" name="attach_126212" title="syslog for 4.8-rc5">attachment 126212</a> <a href="attachment.cgi?id=126212&action=edit" title="syslog for 4.8-rc5">[details]</a></span>
> syslog for 4.8-rc5
>
> I am seeing a flickering artefact window at the top left of my monitors when
> I use 4.8-rc4 and -rc5 on my Skylake GPU using the modeset driver in Ubuntu
> 16.10 on an XPS 15 9550.
>
> The artefact looks a bit like a small black gnome-terminal window with white
> text inside at the top left of the monitor (it's not the same as my actual
> gnome-terminal window, which has orange text in it) and flickers rapidly in
> and out of existence for maybe half a second to a second when it is
> triggered.
>
> I see the the artefact at the top of both my HDMI external monitor and the
> laptop internal monitor (I have them set up with the external monitor on
> top, in case that's relevant). IIRC it appears on the display where the
> mouse is currently.
>
> I find it is triggered reasonably consistently by moving the mouse between
> monitors or by clicking on a gnome-terminal window to focus it and then
> pressing a key.
>
> It makes the desktop unusable so I would rate it higher than normal (for me
> it's a blocker).
>
> The artefact wasn't present in kernels 4.4 through 4.7.
>
> I can't see anything in particular in the log (attached) that is related to
> the flickering. drm logs some CPU buffer underrun messages and also one
> saying "GuC firmware load skipped", which doesn't happen with kernel 4.7.2.
>
> I don't think this is bug
> <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen"
href="show_bug.cgi?id=97450">https://bugs.freedesktop.org/show_bug.cgi?id=97450</a>, because that one seems
> to be talking about full-screen flickering and there it occurs randomly and
> only on the external monitor.
>
> I think the artefact I'm seeing is mentioned in
> <a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - [SKL] Bad mouse cursor flickering since 4.8-rc1 with dual-screen [regression]"
href="show_bug.cgi?id=97242">https://bugs.freedesktop.org/show_bug.cgi?id=97242</a> (<a href="show_bug.cgi?id=97596#c6">comment 6</a>), but that bug
> was primarily about another issue and has been closed.</span >
One can see in your log several issues on multiple components that you may
consider to resolve also, but regarding graphic, the following could be linked
to flickering :
Sep 5 11:17:44 xps15-9550 kernel: [ 16.307746] [drm:gen8_irq_handler [i915]]
*ERROR* CPU pipe A FIFO underrun
Sep 5 11:18:55 xps15-9550 kernel: [ 86.939567] [drm:gen8_irq_handler [i915]]
*ERROR* CPU pipe B FIFO underrun
Sep 5 11:20:12 xps15-9550 kernel: [ 164.003111] [drm:gen8_irq_handler [i915]]
*ERROR* CPU pipe A FIFO underrun
So, there is chance that it is dup of <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen"
href="show_bug.cgi?id=97450">bug 97450</a>, and therefore can you confirm
if, without any external display connected, it is occurring on your laptop
display?
Moreover, add drm.debug=0xe on the boot command line and then attached new
kernel log</pre>
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