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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 1002:68a0 After suspend-resume graphics are sluggish and input lags with displayport connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93073">93073</a>
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<th>Summary</th>
<td>1002:68a0 After suspend-resume graphics are sluggish and input lags with displayport connected
</td>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Driver/Radeon
</td>
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<th>Assignee</th>
<td>xorg-driver-ati@lists.x.org
</td>
</tr>
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<th>Reporter</th>
<td>bugs.freedesktop@nexigon.net
</td>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=120039" name="attach_120039" title="Bisect log">attachment 120039</a> <a href="attachment.cgi?id=120039&action=edit" title="Bisect log">[details]</a></span>
Bisect log
As reported at Launchpad:
<a href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1515776">https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1515776</a>
and to mailinglist:
<a href="http://marc.info/?l=dri-devel&m=144780894513907">http://marc.info/?l=dri-devel&m=144780894513907</a>
After resuming from suspend-to-ram, graphics on displayport connected Dell
U2415 monitor are sluggish and input has lag.
Examples:
- transition from unity greeter login locked status to unlocked status: 6
seconds (normal 1 second)
- transition from clicking dash and getting window: 2-3 seconds (normal <1
second)
- starting gedit: 4 seconds (normal <1 second)
- mouse lags, sometimes the pointer is still on the left side of the screen,
while it should be on the right
- input from keyboard lags, about 1-2 seconds (normal no lag)
When unplugging the Displayport cable all lag is gone.
When plugging displayport back in again lag is back, same as before.
After a reboot, response of graphics and input is normal. So two options to get
rid of the lag: unplug DP or reboot.
Further investigation:
Did a mainline kernel bisect:
>From 3.13.11-ckt27 (good) to v4.3-wily (bad)
First bad is v4.0-rc1-vivid
Did a kernel commit bisect:
>From 3.19 (good) to 4.0-rc1 (bad)
first bad commit: [e55bca26188e45f209597abf986c87cc5a49894a] radeon/audio:
enable DP audio
Commit bisect log is attached
WORKAROUND: radeon.audio=0
However, I'm not able to use audio over Displayport.</pre>
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</p>
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