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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 - click-drag and 2 finger scroll does not work on Thinkpad T440"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106624">bug 106624</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 - click-drag and 2 finger scroll does not work on Thinkpad T440"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106624#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - click-drag and 2 finger scroll does not work on Thinkpad T440"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106624">bug 106624</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>fwiw, I have a t440s so I know the touchpad, should be the exact same hardware
too.
- two finger scroll ON
- edge scroll ON
These two are mutually exclusive, libinput will enable either but not both.
Which one are you setting last?
trackpoints != touchpads, are you trying to measure the wrong device?
The two-finger scroll <span class=""><a href="attachment.cgi?id=139690" name="attach_139690" title="recording while two-finger scrolling">attachment 139690</a> <a href="attachment.cgi?id=139690&action=edit" title="recording while two-finger scrolling">[details]</a></span> has two fingers down but one finger
isn't moving at all. And by that I don't just mean it's not moving much, it
literally isn't sending any events. That's unusual and points at a
kernel/firmware issue.
For <span class=""><a href="attachment.cgi?id=139689" name="attach_139689" title="recording when clicking+dragging">attachment 139689</a> <a href="attachment.cgi?id=139689&action=edit" title="recording when clicking+dragging">[details]</a></span>, libinput debug-events --verbose says:
event20 POINTER_BUTTON +35.32s BTN_LEFT (272) pressed, seat count: 1
event20 - palm: touch 0, palm detected (pressure)
event20 POINTER_BUTTON +38.74s BTN_LEFT (272) released, seat count: 0
event20 - button state: touch 0 from BUTTON_STATE_AREA, event BUTTON_EVENT_UP
to BUTTON_STATE_NONE
i.e. as you press down your finger exceeds the pressure threshold and is now
interpreted as palm, hence it stops moving. I guess what we need here is a
extra toggle that labels the clicking finger as not eligible for palm
detection.
I'd appreciate any help with that, I'm a bit short on time atm.</pre>
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