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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Inverted touchpad coasting possibly caused by desktop effects"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103497">103497</a>
</td>
</tr>
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<th>Summary</th>
<td>Inverted touchpad coasting possibly caused by desktop effects
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>gabriele.mzt@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=135142" name="attach_135142" title="dmesg since boot with drm.debug=0x06">attachment 135142</a> <a href="attachment.cgi?id=135142&action=edit" title="dmesg since boot with drm.debug=0x06">[details]</a></span>
dmesg since boot with drm.debug=0x06
Hi,
I noticed that the touchpad coasting has been acting really strange at random
with the current release candidates of 4.14, with rc6 being the last I tested.
Everything is fine with 4.13 or older releases.
After a bit of experimenting it seems that whenever my desktop environment
shows an on screen display, touchpad coasting happens in the wrong direction:
if I'm scrolling up, the window scrolls down. I can upload a video showing the
problem if needed. I think the problem is caused by some desktop effect that is
used for OSDs since I think I've observed the same behavior even when no OSD
was displayed. In addition to that, disabling desktop effects gets rid of the
problem.
Interestingly I observed this behavior only with QT applications.
This has never happened with 4.13, so I did a bisection and found the change
that's causing this behavior:
commit dc911f5bd8aacfcf8aabd5c26c88e04c837a938e
Author: Jim Bride <<a href="mailto:jim.bride@linux.intel.com">jim.bride@linux.intel.com</a>>
Date: Wed Aug 9 12:48:53 2017 -0700
drm/i915/edp: Allow alternate fixed mode for eDP if available.
I confirm that reverting this change fixes the problem on v4.14-rc6. This could
really be a bug in some userspace component that it's being triggered by that
change, but it has never happened until now, so I'm reporting this here.
I built xf86-video-intel from master
(4798e18b2b2c8b0a05dc967e6140fd9962bc1a73), but the problem persists.
I'm using Debian sid and xserver 1.19.5 on a Dell XPS 13 9333 (i7-4500U with HD
Graphics 4400).
Gabriele</pre>
</div>
</p>
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