As is mentioned in the README in http://zinc.canonical.com/~kamal/xps13-pch-bootparam/, using the boot parameter does correct the black screen on boot (yay!), but does not enable backlight control (which is a shame because it's a really effective for preserving battery life).
I'm on an XPS13 with Saucy kernel 3.11.0-15 #22 from saucy-proposed.
As is mentioned in the README in http:// zinc.canonical. com/~kamal/ xps13-pch- bootparam/, using the boot parameter does correct the black screen on boot (yay!), but does not enable backlight control (which is a shame because it's a really effective for preserving battery life).
I'm on an XPS13 with Saucy kernel 3.11.0-15 #22 from saucy-proposed.