What resolution are the monitors you are using (both the internal LCD
and external monitor)?

The "Virtual 2048 2048" line is not meant to be copied verbatim.  It is
meant to be the size of your virtual desktop.  For instance I have a
1400x1050 LCD on my Thnkpad, and if I connect it to my 1680x1050
external LCD, I need it to be, "Virtual 3080 1050" for both displays to
function correctly.

Additionally I need to setup modes for each monitor.  Look in the xrandr
man page for a list of ways to set modes (--mode, --newmode, --rmmode,
--addmode, --delmode).  --mode can be used to set a mode from the file,
while the latter four can be used to set modes dynamically.

Additionally your displays may or may not be named LVDS or VGA-0, so
please check "xrandr -q" for such info.

As for the pattern you observed in the first paragraph (blanking before
GDM), I believe that this behavior is because X.org takes over the
display responsibilities at that point.

If you still can't get it, attach your xorg.conf and the output of
xrandr -q and I'll try to help you from there.

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