Ok, so now this is really weird ... after rebuilding xorg.conf with this command and restarting X the flickering is totally gone and everything seems to work fine ... that's confusing, because after I upgraded to Hardy the flickering appeared, so it looks like the upgrade 'damaged' my xorg.conf ... hmmm ...

Well thank you a lot Rocket2DMn easy solution but very effective
Best regards, have a nice day

terrorsathan