On 05/19/2011 03:43 AM, Paolo Olivo wrote: > Hi all, > > thank you for all the suggestion for the previous topic. > > I have another issue I found testing multi-touch on Ubuntu 11.04. > > I obtain a weird cursor behavior when I set the coordinate > transformation matrix of the N-Trig multi-touch screen on Ubuntu > 11.04. > > I observed this problem since I wanted to use a DELL XT2 in portrait > format. To rotate the desktop was easy, but then it was also necessary > to inform the xinput server how to map the touch point to the portrait > reference frame. > > I already did this on Ubuntu 10.10 and the result was good using the command: > > xinput set-prop "N-Trig MultiTouch" "Coordinate Transformation Matrix" > 0 -1 1 1 0 0 0 0 1 > > On Ubuntu 11.04 this leads to a cursor that flickers around as you can > see in the video I put here http://vimeo.com/23907071 . The cursor > actually follows my finger, but it also jumps to 3 or 4 different > places, so it is impossible to do anything. > > I noticed that this problem does not happen if the transformation > matrix is only for scale, for example > 2 0 0 0 1 0 0 0 1, but it happens if I want to invert the axes, like 0 > -1 1 1 0 0 0 0 1. > > I also noticed that on my Ubuntu 10.10 the xinput was at version 1.5.2 > with XI version on server 2.0, while on the Ubuntu 11.04 I have xinput > version 1.5.3 with XI version on server 2.1. > > I got the same problem also using a 3M touch-screen. > > Any idea?
Hi Paolo, This is a known issue with the current X server: https://bugs.launchpad.net/bugs/774938. The fix has been released for Oneiric, and hopefully will be released to Natty updates soon. Thanks! -- Chase _______________________________________________ Mailing list: https://launchpad.net/~multi-touch-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~multi-touch-dev More help : https://help.launchpad.net/ListHelp
