Low and bad screen resolution with radeonhd [SOLVED]

Hi Archers,
I just setted up a brand new PC with an ATI HD4550 GPU and a 22'' 1680x1050 monitor.
I can run Xorg and even Gnome using the radeonhd drivers, but the max resolution I can get is 1280x1024 (which isn't even the correct ratio).
The lower suggested resolutions' ratios are bad as well.
I didn't write an xorg.conf file.
When I try to run X with a configuration file generated by X -configure, the monitor displays an error message like "Unsupported video signal".
What can I do?
Last edited by monsieur moche (2009-10-15 13:44:01)

monsieur moche wrote:Here is the xorg.conf of my last test: (...)
As you can see, I uncommented some lines and I added Option "PreferredMode" "1680x1050" to the monitor section.
After a lot of gasping, moaning and countless tries, this xorg.conf works here, with an analogue monitor. Look at the bottom for how I set the mode choices. Good luck!
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/75dpi:unscaled"
FontPath "/usr/share/fonts/TTF"
FontPath "/usr/share/fonts/Type1"
EndSection
Section "Module"
Load "evdev"
Load "glx"
Load "extmod"
Load "record"
Load "dri2"
Load "dbe"
Load "dri"
Load "drm"
EndSection
Section "DRI"
Group "video"
Mode 0666
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbOptions" "terminate:cntrl_alt_bksp"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
# Option "ZAxisMapping" "4 5 6 7" # Xorg's oppsett
Option "Buttons" "5"
Option "ZAxisMapping" "4 5"
Option "ButtonMapping" "1 2 3 6 7"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
HorizSync 30.0 - 100.0
VertRefresh 50.0 - 100.0
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
### [arg]: arg optional
#Option "NoAccel" # [<bool>]
Option "AccelMethod" "exa" # [<str>]
#Option "offscreensize" # [<str>]
#Option "SWcursor" # [<bool>]
#Option "ignoreconnector" # [<str>]
#Option "forcereduced" # [<bool>]
#Option "forcedpi" # <i>
#Option "useconfiguredmonitor" # [<bool>]
#Option "HPD" # <str>
#Option "NoRandr" # [<bool>]
#Option "RROutputOrder" # [<str>]
Option "DRI" "on" # [<bool>]
#Option "TVMode" # [<str>]
#Option "ScaleType" # [<str>]
#Option "UseAtomBIOS" # [<bool>]
#Option "AtomBIOS" # [<str>]
#Option "UnverifiedFeatures" # [<bool>]
#Option "Audio" # [<bool>]
#Option "HDMI" # [<str>]
#Option "COHERENT" # [<str>]
Identifier "Card0"
Driver "radeonhd"
VendorName "ATI Technologies Inc"
BoardName "RV770 [Radeon HD 4850]"
BusID "PCI:2:0:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "Enable"
EndSection

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