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

[Henrik Rydberg]

The attached package is built yet another way, using the packaging.quilt
branch, proposed to be merged into this SRU. The irony is that the quilt
patch was included in the first version of the package, and later
removed as someone assured it would work. It probably does in some
settings, but apparently not in mine. :-)

So: expected result with this i386 package (test3) is the same as with
test1.

** Attachment added: "libutouch-grail1_1.0.15-0ubuntu2~test3_i386.deb"
   https://bugs.launchpad.net/utouch-grail/+bug/667802/+attachment/1724434/+files/libutouch-grail1_1.0.15-0ubuntu2%7Etest3_i386.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.