Trying to change screen resolution to 1280x1024 under System->Preferences->Screen Resolution, but I can only choose from 640x800, 800x600, 1024x768 and 1280x800. I have an external monitor connected to my laptop. The laptop's internal monitor has a maximum resolution of 1280x800, and I suspect that is why I'm not allowed to set a higher resolution...

I was told to edit xorg.conf and manually add 1280x1024 in the list of resolutions, but I'm no expert on X or Linux in general, so I may have screwed it up somehow. Here's what it looks like in xorg.conf:



Section "Monitor"
Identifier "Generic Monitor"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection

Section "Monitor"
Identifier "aticonfig-Monitor[0]"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection

Section "Device"
Identifier "Generic Video Card"
Driver "fglrx"
Option "VideoOverlay" "on"
Option "OpenGLOverlay" "off"
BusID "PCI:1:0:0"
EndSection

Section "Device"
Identifier "aticonfig-Device[0]"
Driver "fglrx"
Option "VideoOverlay" "on"
Option "OpenGLOverlay" "off"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "Screen"
Identifier "aticonfig-Screen[0]"
Device "aticonfig-Device[0]"
Monitor "aticonfig-Monitor[0]"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection




Thx for your help, people.

Did you submit the full xorg.conf file?

I have a feeling that the video modes you posted are actually not being used at all... Maybe your xorg.conf is calling on Screen 'aticonfig-Screen[0]' instead of 'Default Screen'

Try copying

Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"


Into the section that looks like:
Section "Screen"
Identifier "aticonfig-Screen[0]"
Device "aticonfig-Device[0]"
Monitor "aticonfig-Monitor[0]"
DefaultDepth 24
SubSection "Display"
<paste here>
Viewport 0 0
Depth 24
EndSubSection
EndSection

Yay thx, worked like a charm.

Glad to be of help. Cheers...