I can confirm complete freeze on 12.04 (no mouse, no keybord, no switch to tty possible)
It seems that the system freezes only when I run a virtualbox (with Windows 7, MS office application running) and additionally browse the web (firefox) outside the virtualbox. Although this might be coincidence or only one of possible triggers. System: Ubuntu Release 12.04 (precise) 64-bit Kernel Linux 3.2.0-32-generic GNOME 3.4.2 nvidia graphics driver version 295.40 Hardware: Dell Latitude E6520 8 GB memory Processor: Intel Core i7-2720QM CPU @ 2.20GHz × 8 graphics: NVIDIA NVS 4200M I had a look into kern.log. Here are the last entries: [11344.255385] warning: `VirtualBox' uses 32-bit capabilities (legacy support in use) [11350.185989] EXT4-fs (sda2): Unaligned AIO/DIO on inode 7208975 by VirtualBox; performance will be poor. [11432.691593] show_signal_msg: 51 callbacks suppressed [11432.691597] VirtualBox[3630]: segfault at 7f9d61cf8cdc ip 00007f9dbb946149 sp 00007fff6eb539d8 error 4 in libc-2.15.so[7f9dbb7fe000+1b5000] The problem is described here, too: https://www.virtualbox.org/ticket/10895 but there is no workaround. ** Bug watch added: Virtualbox Trac #10895 http://www.virtualbox.org/ticket/10895 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/993187 Title: ubuntu 12.04 completely freezes frequently. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/993187/+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
