Jim Rorie: It's not the same bug. Note the keywords "jump erratically all over the screen *constantly* " and "not the same as known bug where cursor jumps to place on release of finger".
This bug is triggered by having and keeping two (or more) fingers pressed - the mouse pointer jumps around even though I'm not moving or releasing or pressing my fingers. It looks like a protocol mismatch, the touchpad sending information about both finger positions, and the driver expecting data about a single finger, and returning garbage to X. That bug number 21614 you linked, as well as the one you described in comment #12, is triggered by *releasing* one finger and keeping another one pressed. The cause of that other bug is obvious - The driver reports the finger position as the average of physical finger positions, so when two fingers touch the pad it reports a single but heavy finger in the middle, and when you release one finger it reports the position of the remaining finger, so to X it looks like the finger has moved and it moves the pointer accordingly. OTOH 308191 may be related, as xinput incorrectly reports the touchpad not supporting multi-touch, so it's possible that fixing that one will fix this one. -- erratic cursor movement with multi touch https://bugs.launchpad.net/bugs/503944 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
