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Some hardware companies don't support Free Software in order to be in control of the hardware they sell despite the users. Still a free driver may work on them using an uncommon configuration.
The configuration file is stored in:
We can help each other by posting those configurations here.
How to use a xorg.conf file
A xorg.conf file is a text file keeping our graphic configuration. You should backup your old configuration file in case something goes wrong:
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf_old
And then copy the configuration file linked at the end of this page into a newfile:
sudo gedit /etc/X11/xorg.conf
Now you should save and exit gedit because it has administrator privileges. Next time you turn on your computer it should work.
How to create a xorg.conf file for unsupported GPU
If your Resolution is low because of lacking hardware drivers, you can still try the drivers that come with gNewSense to see if anyone can get a higher resolution by using the command:
You should try the GPU drivers and variation for the screen, to see if it works click test or Alt + t.
If you get some working configuration it would be really usefull if you post it here.
Working xorg.conf files
Nvidia GeForce 9100 working on Acer 4530 and i386 architecture