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I have both an AMD ( HD 7850 ) and an Nvidia ( 8400 GS ) GPU installed on my motherboard.

The Nvidia card is only there because of its S-video port, which I use to output to my old'n'bulky CRT TV. I have no need of it in Ubuntu, and things seem to get fussy at times because of its presence.

I was wondering if there was any way to make Ubuntu ignore its existence. I know that it's possible to disable the Nvidia GPU in Windows via the device manager, but I've so far been unable to find a similar method in Ubuntu. Any ideas?

Please let me know if there is any other information that I should provide :)

System specs:

  • OS: Ubuntu 14.04
  • Motherboard: GA-990FXA-UD3 rev 1.1 F9 bios
  • CPU: AMD Phenom II x4 965 BE
  • GPU 1: AMD Radeon HD 7850
  • GPU 2: Nvidia 8400 GS
  • SPU: Creative Audigy 4 - Sound Blaster
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You will have to uninstall the Nvidia drivers, assuming you've previously installed them:

  1. Determine what packages you need to uninstall with:

    $ dpkg --get-selections | grep -i nvidia
  2. sudo apt-get purge them.

Note: sudo apt-get purge nvidia-* should also work.

Now, I believe that in order to make sure your Nvidia card isn't used at all by Linux, you will have to blacklist the nouveau driver. You can do so as SU:

(note: omit the # character)

# echo -e "\n\n# Manually blacklisted nouveau so as to ensure Nvidia card is disabled\nblacklist nouveau" >> /etc/modprobe.d/blacklist.conf
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