All kubuntu releases since 8.10 don't like my laptop (hp 2710p), seems that kdm doesn't behave well with my graphic card. I never had all this problem with my previous laptop, but that had a NVidia graphic card, while this one have an intel graphic card (this shows that open source drivers doesn't automatically means better drivers).
Anyway this is a serious issue for me, cause linux is my only os on my laptop and my actual kubuntu is reaching it's end of life. Let's hope to have an happy ending.
Cya
