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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>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - Acceleration still too slow with medium finger movements"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101139">bug 101139</a>
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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 - Acceleration still too slow with medium finger movements"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101139#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Acceleration still too slow with medium finger movements"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101139">bug 101139</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>Thanks for the patch greg, sorry about the delay. I tried this on top of
43de03a08c7cdbe on the t440s that I have here and, well, it's almost unusable,
sorry. On the default 0 setting it's way too fast, reducing it to -0.75 like
Nate makes very slow to slow movements almost match the finger movements. but
as soon as I go past that basic speed, the cursor is unpredictable and lands in
the screen edges almost immediately.
I printed the curve (./build/ptraccel-debug --filter=touchpad --mode=accel,
then use the gnuplot commands at the top of the output) and it's no surprise
that it feels fast. The max accel factor is 9 (vs ~3 in the current code) and
the increase is sooner and much steeper than the current code. So at least the
fast movement isn't some weird side-effect but the intention.
So we definitely need some tuning here. Or am I missing something? I only
applied the patch from <a href="show_bug.cgi?id=101139#c7">comment 7</a> locally.
And if that's it, I *really* wonder where the bug is because it's one thing to
argue about a personal preference for pointer feel but another to see that code
that *should* be device-independent behaves so different on different devices.
There's a bug in the accel code somewhere but I don't know where.</pre>
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