KDE hang AGP cards

[Eng ler ...(admin)]

I'm using Mandrake 5.1 and KDE keep on hang when using AGP cards. I try S3
Virge/GX2 and Cirrus Logic 5465, both also hang. Tried with 256,16 bit and
24bit colours but still hang.
I switch to another Windows Manager like Fvmn95 and Afterstep, but the
same problem accoured !

But when i switch to PCI cards, it works fine !! Is there any problem with
between AGP and linux or KDE ??