I have started using Ubuntu 64 bits and with this version the backtrace shown after the crash has changed. I'm attaching a new picture.
** Attachment added: "Picture of the crash on Ubuntu 13.04 64 Bits" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1106216/+attachment/3647089/+files/backtrace.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1106216 Title: Laptop hangs and shows a black screen with a backtrace To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1106216/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs