Surprisingly, the bug can be solved by electrically powering off the PC : I don't encounter this bug since I've done this manipulation 2 weeks ago. So, I suspect an issue with the motherboard staying under tension when the PC is "off".
My motherboard spec's : dmi.bios.date: 06/30/2010 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F10 dmi.board.name: P55-UD6 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF10:bd06/30/2010:svnGigabyteTechnologyCo.,Ltd.:pnP55-UD6:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55-UD6:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: P55-UD6 dmi.sys.vendor: Gigabyte Technology Co., Ltd. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/916568 Title: Multiple focus problems on first connexion To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/916568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
