I have an old IMac Mid 2012 Model. This model was known to have some issues with the GPU. Apple did have a replacement program but that window is now closed. Specs of the machine are available here - https://support.apple.com/kb/sp667?locale=en_IN (I upped my Ram to 24GB)
I have installed Xubuntu and wanted to know if I could switch Xubuntu to Integrated Graphics thus making my system useable again.
Thank you for your help.
The link showing the specifications you've provided in the question gives the information that your machine has a dedicated NVIDIA GPU. That's the reason why I will provide you with instructions how to deactivate an AMD and a NVIDIA GPU in order to make only use of the integrated GPU.
1. variant - In case your PC has a NVIDIA GPU (as provided in the specification link)
Open a terminal and execute the following command : sudo nano /etc/default/grub
Add nouveau.modeset=0 to the line : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
So that it reads : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nouveau.modeset=0"
Press Ctrl + X to close the file and confirm the change by pressing Y and Enter.
Then execute this command : sudo update-grub (to update the GRUB configuration)
2. variant - In case your PC has an AMD GPU (as provided in the title of the question)
Open a terminal and execute the following command : sudo nano /etc/default/grub
Add radeon.modeset=0 to the line : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
So that it reads : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=0"
Press Ctrl + X to close the file and confirm the change by pressing Y and Enter.
Then execute this command : sudo update-grub (to update the GRUB configuration)
Restart the PC, now you are using the integrated GPU only, the dedicated GPU is disabled.
