KDE 4 hangs at splash screen when using KMS enabled 10-CURRENT

Fri Jun 29 13:15:39 UTC 2012

>I freshly built x11/xorg and x11/kde4 on FreeBSD 10-CURRENT and was
>ready to use it with new Intel driver, but
>after I kldloaded i915kms.ko and started X, KDE just hung up at its
>splash screen after displaying its logo (last icon). Then screen got
>blank with only a movable mouse cursor on it.

I disabled "Composite" extension in xorg.conf and KDE started fine. No
effects though.
Is there an issue with Intel driver or X or anything else?
Everything seems to work quite well, but I'm just curious.