I've found how to activate the external monitor using xrandr from the 
command line:

$ xrandr --output LDVS --mode "800x600"
$ xrandr --output LDVS --mode "1024x768"

The first will get a signal to the external monitor, and the second 
restores the screen to the usual resolution.  Running the second by 
itself is not enough.

> The other bug mentions using packages from debian sid.  You may want to
> try those packages as well (or sit tight and see if it is packaged for
> Hardy).

I actually tried the packages from sid first, though they were also at 
6.9.0.  The results were the same, but it messed up the keyboard repeat.

> Before marking this as a duplicate of the other bug, I would test that
> it is a regression from Gutsy.  The other bug mentions it worked on
> Gutsy but is broken on Hardy.  If it is not working on Gutsy, then there
> is more at play than bug 23081.

I tried a Gutsy live CD, and got the same result as I currently have 
using the Intrepid packages.  It seems that the no-signal problem was 
the same as in 231081, but the issue with the external monitor not 
turning on right away is something else.

-- 
open source ati driver in hardy can't do external monitor on laptop
https://bugs.launchpad.net/bugs/222905
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