Bug 2512

I recently installed X.org, and discovered to my delight that it fixed some of
my longstanding complaints with the XFree86 driver on my Radeon IGP card: I no
longer get screen corruption on the second head, my laptop's LCD panel switches
off when the second head is plugged in, and DRI seems to work!  Naturally,
therefore, I have new complaints to bring forward ;-)

Now that I can use the second head (an external CRT) in a clone mode, the fact
that the driver (apparently) only checks for the presence of the CRT on startup
is getting a bit annoying.  In particular, I'd like to be able to unplug the
laptop and carry it somewhere else to work.  Unfortunately, if I do this, the
LCD remains disabled until I kill the X server and restart it. :-(  This means,
of course, that I have to kill all the software that's running in my X session.
I would like to be able to unplug (and preferably also plug in) an external
monitor and have the X server switch between the panel and the other monitor as
I do so.  I'm pretty sure this worked in That Other Operating System, so the
hardware must be able to handle it.