OK, here we go:
I hit ctrl-alt-F1 to switch to a virtual terminal and the heavy
flickering immediately returned. With some difficulty I opened gterm,
ran ps -aux and noticed:
ubuntu 16416 0.5 0.6 104924 13208 ? Ss 00:41 0:01
/usr/lib/gnome-settings-daemon/gnome-settings-daemon
... which I previously had killed.
$ killall -9 gnome-settings-daemon
... and I'm back to a flicker-free desktop.
So it looks like that's the problem.
** Also affects: gnome-settings-daemon
Importance: Undecided
Status: New
--
[gm45] blinking display, high CPU utilization by xorg
https://bugs.launchpad.net/bugs/543808
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