@Bojan, first off can you attach the output of "lspci -vvnn" on your
machine.
Secondly, if you boot the ubuntu live CD (not kubuntu), does your computer hang
(or show very high CPU usage) when you visit:
http://mundoplus.tv/
Thanks.
** This bug is no longer a duplicate of bug 351990
Kubuntu
*** This bug is a duplicate of bug 351990 ***
https://bugs.launchpad.net/bugs/351990
** This bug has been marked a duplicate of bug 351990
Kubuntu freezes when desktop effects are enabled
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computer freeze when having effects turned on
https://bugs.launchpad.net/bugs/350319
You received
I didn't know which Xorg log i should put so here also a new.
** Attachment added: "Xorg.0.log"
http://launchpadlibrarian.net/24452125/Xorg.0.log
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computer freeze when having effects turned on
https://bugs.launchpad.net/bugs/350319
You received this bug notification because you are a member
** Attachment added: "Xorg.0.log.old"
http://launchpadlibrarian.net/24452057/Xorg.0.log.old
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computer freeze when having effects turned on
https://bugs.launchpad.net/bugs/350319
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to kdebase-works