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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Thinkpad X240 touchpad movement is jumpy and extremely imprecise"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106141#c16">Comment # 16</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Thinkpad X240 touchpad movement is jumpy and extremely imprecise"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106141">bug 106141</a>
from <span class="vcard"><a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> <span class="fn">Peter Hutterer</span></a>
</span></b>
<pre>ok, I just replayed this here to check a patch that I thought would fix this -
this data is complete garbage. It has a distinct saw tooth behaviour that
causes the jumpy behaviour, e.g.:
19.038526: ↙↓ -1/ 1 | *********** |
19.047722: ↙← -2/ 1 | *********** |
19.057847: ↙← -2/ 1 | *********** |
19.068035: ↙← -4/ 1 | *********** |
19.078270: ↙← -22/ 1 | *********** |
19.088396: ↙← -22/ 21 | *********** |
19.097523: ↙↓ -1/ 21 | *********** |
19.107754: ↙↓ -2/ 21 | *********** |
19.117948: ↙↓ -1/ 21 | *********** |
19.128083: ↙↓ -2/ 21 | *********** |
or:
17.026707: →↘ 22/ 1 | *********** |
17.036102: →↘ 22/ 1 | *********** |
17.046134: →↘ 22/ 1 | *********** |
17.056361: →↘ 22/ 1 | *********** |
17.066739: →↘ 1/ 1 | *********** |
17.096367: →↘ 1/ 1 | *********** |
17.106718: ↓↘ 1/ 19 | *********** |
17.116698: ↓↘ 1/ 19 | *********** |
17.127087: ↓↘ 1/ 19 | *********** |
17.137231: ↓↘ 1/ 19 | *********** |
The questions in <a href="show_bug.cgi?id=106141#c15">comment #15</a> are still valid but I suspect the only way to get
rid of those jumps is by turning the pointer acceleration down by quite a bit.</pre>
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