I wonder if the xorg fix/workaround described here would work: https://bugs.freedesktop.org/show_bug.cgi?id=2750
Description: When WC MTRR is set up, any previous MTRR region with offending size will block correct MTRR setup. -- MTRR is not properly setup on Intel Northbridge Chipset (P35, X38, X48) with more than 3GB RAM and with Memory Remapping Enabled https://bugs.launchpad.net/bugs/224404 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