Updated to xserver-xorg-video-radeon
1:6.9.0+git20080802.1f3eee36-1ubuntu1. After reboot, the computer
completely freezed upon X startup - no sysrq keys working, I had to
unplug the second monitor (I *think* the old driver did this as well
after I reported this bug, but I'm not sure). Then I went to xorg.conf
and commented out all config parameters in the Device section:

Section "Device"
        Identifier      "ATI Technologies Inc RS485 [Radeon Xpress 1100 IGP]"
        Boardname       "radeon"
        Busid           "PCI:1:5:0"
        Driver          "radeon"
        Screen  0
#       Option "DRI" "True"
#       Option "AccelMethod" "EXA"
#       Option          "MergedFB"      "off"
EndSection

And it works correctly now! I tried this on the old driver as well and
it didn't help - X guys evidently fixed it :) I'm going to play a bit
with the settings and I'll try to verify which option caused the freeze.

-- 
[RS485] second monitor resolution cannot be changed
https://bugs.launchpad.net/bugs/255875
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