I just installed Xubuntu 13.04 on a new Dell XPS 13 Ultrabook. When I boot up the screen brightness is EXTREMELY dim. Adjusting the screen brightness doesn't do anything. This is obviously a very new bug with 13.04.
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Along with @GM-Script-Writer-62850's answer, if you're using an EFI BIOS boot, you ned to go into the BIOS setup and set "Load Legacy Rom" to Enabled.
I have experimented with the minimal GRUB line to get this working and I only need
AFAIK Legacy is anything not Windows 8, and I've not experienced any performance hit.
here are a couple kernel boot parameters you can try
This is there you add that code, I had to use the 3ed one to get mine working right, it may be necessary to use 1 or 3 combined with the second one
The file to edit is :
once you edit it run
sudo update-grub then reboot