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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Responsivity to input with vsync on is slower after update"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74195">74195</a>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
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<th>Summary</th>
<td>Responsivity to input with vsync on is slower after update
</td>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Reporter</th>
<td>janjanjanx@gmail.com
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>Status</th>
<td>NEW
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<th>Version</th>
<td>git
</td>
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<th>Component</th>
<td>Driver/nouveau
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<th>Product</th>
<td>xorg
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<pre>I use compton compositing manager wich uses DRM_IOCTL_WAIT_VBLANK for vsync.
Recently I updated from kernel 3.9 to 3.13 and responsivness (or "input lag" or
however it's called) got much worse, mostly noticable when moving windows or
scrolling. With kernel 3.13 the windows are 3-5 frames behind mouse when
moving, on 3.9 kernel they were only 0-1 frames behind. I also tried kwin, wich
had less noticable slowdown (from 1-2 frames behind to 3-5 frames behind).
I tried different kernel versions from nouveau git and found out, that the
slowdown was caused by this commit:
<a href="http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=0fa9061ae8c10a9178d696cf48d94c3bf2848f9f">http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=0fa9061ae8c10a9178d696cf48d94c3bf2848f9f</a>
I guess the commit is important and can't be undone, but the bad responsiveness
really annoys me, so I would be glad if there is a solution.
GPU is GTX 560 Ti
xserver 1.14.5
xorg-video-nouveau 1.0.10
libdrm 2.4.52
(Debian sid)</pre>
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