For unrelated reasons, I had to reinstall Ubuntu and X configuration
went to the defaults. After enabling "propietary driver", X had more or
less the same issue:

- Booting without the external monitor limit the maximum resolution up to 
1024x768
- Plugging the external monitor makes no difference
- Restarting X gives the higher resolution BUT all the widgets are constrained 
to a inner square of 1024x768 (only the desktop is outside this area)

I think this bug limits usability of Ubuntu as a desktop system. Mac OSX
behaves better when plugging or unplugging monitors (redetecting and
autoadjusting the desktop size to the new maximum).

As a workaround, now I am using envy-ng with customized xorg.conf and
amdccle (AMD Control Center) in order to redetect and readjust
resolution

-- 
screen resolution autodetection when plugging monitor
https://bugs.launchpad.net/bugs/250951
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