Did you install the rpm or from source?
Might build from source because one can pass the enable v4l2 option which may not be present in the rpm version. Also might email the developers and see what they recommend to look for.
Distribution: RHEL 5.1 with Pieces of this and that.
Kernel 126.96.36.199, KDE 3.5.8 and KDE 4.0 beta, Plus Development src.rpm, ATI fglrx64_7_1_0-8.433-1 rpm with 3D and DRI working.
Acer 5100-5840 with webcam, ati, sdcard reader, sound, atheros based wireless, all working. Only thing not working is the memory stick reader.