Well, I found a workaround: I added the following lines in the "Monitor"
section corresponding to my external monitor in xorg.conf:
HorizSync 30-83
VertRefresh 55-75
These are the figures that appear in the log in the part where the external
screen is detected:
(II) RADEON(0): Ranges: V min: 55 V max: 75 Hz, H min: 30 H max: 83 kHz,
PixClock max 130 MHz
However it seems that for some reason these detected values are
"forgotten" at some point. I've never had to have those lines before
yesterday.
--
Dual head broken in Feisty
https://launchpad.net/bugs/85081
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