After one month using ubuntu 13.04 in a XPS13, the backlight has desapeared(brightness up/down) doesn't change anything.....even the buttons work.
I am pretty sure that this started after updating the suggested packages that included new kernel version......
I am trying to figure out how to proceed but I haven't found anything yet......
Anyone could help me to be able to see the screen a little bit "brighter"? I can use the laptop but it's pretty difficult to read it without enought brigthness.
Thanks in advance,