often high cpu usage for xorg process

[jpgeerets]

hi folks,

a little time ago i upgrade my 710 to 804 and kde4.

since that time, xorg needs sometimes a lot of cpu.
about 20-60%.
this causes a total cpu of 100% and even sometimes my system crash...

anyone any idea how to solve this?

i hope you can help me with this....

thanks in advanced


Jean-Paul