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<body><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> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Slow and fast movements on T450s touchpad are unpredictable"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96848">bug 96848</a>
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<th>What</th>
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<td>peter.hutterer@who-t.net
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Slow and fast movements on T450s touchpad are unpredictable"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96848#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Slow and fast movements on T450s touchpad are unpredictable"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96848">bug 96848</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>there's two components that matter: libinput touchpad acceleration is different
to the synaptics one (depending on the hardware, because the synaptics one
doesn't take hw into account so it varies greatly, libinput is mostly the same
on all touchpads). libinput is slower than synaptics by default and it is more
tied to your fingers, i.e. once you stop moving it stops quicker than
synaptics. this (theoretically) allows for more precise positioning since the
cursor stops with your finger and you shouldn't overshoot too much.
as for small movements: the T450 has broken hardware. if you move slowly from
left to right you see that the motion is not continuous but rather comes in
waves. this is a hw issue, the sensors are too far apart (or the firmware
filters it) and we don't get motion events in the gaps between. we work around
this in libinput and avoid pointer jumps but there's only so much we can do,
you still get the wavy motion. See <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Hard to position a cursor on Thinkad X1 Carbon 3rd gen after f6c2d4b8b5e1968411568d81b47488a655ba47a1."
href="show_bug.cgi?id=94379">Bug 94379</a> for more info.</pre>
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