Sorry for the delay in replying - work's been rather busy. Switching to UXA solves this problem. The white screen is gone! Dual screen behaves as expected.
Unfortunately somewhere in the set of updates which got installed something else broke. About once per day, the entire screen just goes black and a reboot is required. Next time it happens and I can login remotely to the laptop, I'll open that as a new bug in launchpad. -- [i945gm] virtual >2048 in xorg.conf causes blank white screen on login https://bugs.launchpad.net/bugs/379805 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