Did you install from scratch or upgrade?
I installed from scratch.
Incidentally, I have a workaround for the problem with the backlight. Essentially the brightness control is balked the first login, but logging out solves the problem. Logging out can be problematic if you can't see the screen well, of course.
This is fine, but it aggravates a problem with the wireless -- I find that if you log out BEFORE the wireless has connected, you can't login again.
The touchscreen is working now, and also multi-touch scrolling on the mouse pad.