Hello, The bug is still there after upgrading the BIOS. I should add that I only have the problem with Firefox and Thunderbird, but not the KDE apps. I suspect the problem is related to GTK: some programs like grsync and gimp seem OK, but I've seen they don't display much text like firefox or thunderbird do. I've seen the bug in some text fields displayed by Handbrake
Matthieu P:S: output of the dmidecode commands: A16 12/06/2013 ** Changed in: xorg (Ubuntu) Status: Incomplete => New -- 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/1354841 Title: Screen corruption (characters are drawn as black squares) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1354841/+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