Same problem for me with mobility 9700 with radeon driver:
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon
9600 M10]
This is the xorg.conf that is generated by dpkg-reconfigure
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection
Section "Device"
Identifier "Configured Video Device"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
EndSection
And here are the warnings and errors:
(WW) RADEON(0): LVDS Info:
(WW) RADEON(0): DDC2/I2C is not properly initialized
(WW) RADEON(0): DDC2/I2C is not properly initialized
(EE) RADEON(0): No valid modes.
(EE) Screen(s) found, but none have a usable configuration.
--
X fails to start with ATI Radeon 9100 IGP
https://bugs.launchpad.net/bugs/141539
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