Very good news for Intel Ivy Bridge (i5-3570K, etc.) users! It's a Kernel Bug (drm-intel).
Install Linux 3.3.6 and the system runs stable :-)) Link: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3.6-precise/ Download this files in a folder: linux-headers-3.3.6-030306-generic_3.3.6-030306.201205121335_amd64.deb linux-headers-3.3.6-030306_3.3.6-030306.201205121335_all.deb linux-image-3.3.6-030306-generic_3.3.6-030306.201205121335_amd64.deb Start the Terminal, go to your download folder and type this: dpkg -i *.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/993187 Title: ubuntu 12.04 64bit completely freezes frequently To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/993187/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs