Thank you for helping. I have upgraded BIOS to F13 although it should only improve USB3.0 compatibilty. Lets wait for about a month for the problem to appear.
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date F13 03/21/2012 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1265065 Title: Desktop freeze while drag-maximizing window To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1265065/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp