I just installed Ubuntu on my laptop. The screen resolution is stuck in 1024x768. The screen is made for 1280x800. When I run xrandr I get:

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 800 x 600, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
   1024x768       61.0* 
   800x600        61.0

1280x800 isn't offered and I get gamma size error. I was going to look into the Xorg.conf file but I couldn't locate it.

1280x800 was displayed in Windows 7 and I think it is being displayed in Grub before Ubuntu starts also. Here are some details about my computer:

  • CPU: Intel atom D2500 1.86GHz
  • Chipset: Intel 945GSE+ICH7M
  • LCD: 14" TFT 16:9
  • Resolution ratio: 1280*800
  • Video Card: Intel integrated GMA950

Does anyone know how to fix this?


Refer to choosing correct driver package here: Linux Graphics Drivers from Intel

Possible solution is:

sudo dpkg-reconfigure -phigh xserver-xorg
sudo reboot

Other way:

Step 1. Create mode line by using gtf

Thus if your output have 61.0Hz frequency:

gtf 1280 800 61.0 - this command will calculate your Modeline for 1280x800

Step 2. Create new mode for xrandr

xrandr --newmode <value of your modeline without word "Modeline">

Step 3. Add new mode to output

xrandr --addmode VGA 1280x800_61.00 

And if commands above DON'T bring any errors:

Step 4. Choose your new mode

xrandr --output VGA --mode 1280x800_61.00
  • I get an error about 'xserver-xorg' isn't installed. How do I fix it? – Jack Apr 18 '14 at 4:04

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