Known Bugs
From ArchPwn
ATI graphics card boot problems
If you're experiencing boot problems or errors while trying to start X server, you could try to disable KMS at boot time by appending the following arguments to kernel parameters:
radeon.modeset=0 nomodeset
Intel graphics card boot problems
The same problem has been encountered while using Intel based graphical chipsets such as i915. The solution is the same: disable the KMS.
i915.modeset=0 nomodeset
Drivers for injection are missing
We are working on it. If you are interested in helping contact me.