[Bug 667802] Re: Tap is sometimes not registered on touchscreens

[Henrik Rydberg]

Thank you very much for the evemu data. With it, I was able to reproduce
the problem, and it seems the package in the unstable ppa is not
applying the patch properly. Without the patch, replaying the sequence
would only move the pointer a couple of times. With the patch applied,
the pointer would move between 11 distinct positions. Those positions
can also be seen using mtview.

Please find attached two debian packages. The first one, test1, is the
package as it should have been in the unstable ppa, with the patch in
question properly applied. The second package is with the additional
patch which is applied for natty only (so far). Please test them - if
everything is correct, you should find that both work.

Thanks!


** Attachment added: "libutouch-grail1_1.0.15-0ubuntu2~test1_amd64.deb"
   https://bugs.launchpad.net/utouch-grail/+bug/667802/+attachment/1724383/+files/libutouch-grail1_1.0.15-0ubuntu2%7Etest1_amd64.deb

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Tap is sometimes not registered on touchscreens
https://bugs.launchpad.net/bugs/667802
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Status in uTouch-grail: New

Bug description:
Vincent Gerris wrote on 2010-10-04 (from #637106):

What happens is, that if I touch the screen, the cursor does not move from the previous position sometimes.
For example when I touch 6 different places on the screen, the cursor would follow 3 times and the other 3 not (it would remain at the 3rd position).

Things that effect this: when I press harder on the screen, sometimes the cursor does appear on that spot.
When I touch and then drag, the cursor always follows.

This is a confirmed problem, and a patch for it is on its way.

TEST CASE: Visible on touchscreens. Move a single finger around the screen, and tap lightly with a few seconds interval. The pointer will follow sometimes, and sometimes it will not. With the patch, the pointer will follow every time.