Today my friend solved this problem he added pci=nomsi to grub menu and for now system work as it should so i gues that problem is solved
** Changed in: linux (Ubuntu) Status: Incomplete => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/946641 Title: System stop at black dos like screen. Ubuntu 11.04 a higher To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/946641/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs