I'm testing with the same hardware except my ATI GPU. I change to nvidia GPU.
There is now no problem with compiz and proprietary nvidia driver. So I think it's the driver of ati GPU: apt-cache policy xserver-xorg-video-ati xserver-xorg-video-ati: Installed: 1:6.13.0-1ubuntu5 ** Attachment added: "lspci-vvnn-nvidia" http://launchpadlibrarian.net/44701480/lspci-vvnn-nvidia -- impossible to use Thunderbird with compiz https://bugs.launchpad.net/bugs/565950 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs