I was able to get everything working on mainline kernel w/ mate installed, but somehow the touchscreen's left-to-right is acting weird. The cursor moves opposite to how I'm moving the pen, but only in the x-direction. It follows the pen up and down still. If I change the rotate option in to 270 instead of 90, the y-direction gets mirrored instead of the x. Is there an option to only mirror one axis?