[arch-general] Plasma-desktop in KDE 4.7 can not start up

[Leon Feng]

Hi,

After upgrade to KDE 4.7, plasma-desktop can not start anymore. Login in
from kdm will stop at the splash screen.
Switch to console by ctrl + alt + F1 and then run "top" plasma-desktop is
using 100% CPU.
Run "pkill plasma-desktop" , Login continue. But screen is black. I check
.xsession-error file and found nothing special.

Does anyone encounter the same problem? How to find more info to track down
this problem? Thanks.