I am new to Linux and having a very difficult time running Elementary OS Loki without any hiccups. I am currently running it on a 2011 Macbook Pro with an AMD Radeon GPU as well as an integrated Intel GPU. I want to disable the AMD GPU but cannot figure out how. I have searched for several hours and have not solved my problem.
Currently I have "nomodeset" written before "quiet splash" in grub in order to be able to use the laptop. To my knowledge, both graphics cards are still operating. If I do not have "nomodeset" written in, upon booting the screen will remain black.
Like I said, I am new and have searched for several hours and this is as far as I have been able to come. I have tried many different methods (posted a few below) and am still lost. Thank you for any help.
1.
To edit file :
sudo nano /etc/default/grub
Find line :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
And replace with :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=0 amdgpu.runpm=0
acpi_backlight=intel_backlight"
To regenerate config :
sudo update-grub
Reboot :
sudo reboot
2.
/etc/default/grub: Add amdgpu.runpm=0 to GRUB_CMDLINE_LINUX_DEFAULT
Included above.
/etc/rc.local: Add the following command:
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
This step caused my system to freeze on shutdown so I just skipped it.
/etc/X11/xorg.conf: Create the file if it doesn't exist, and add the
following in order to get the backlight controls working (otherwise it
would be misdetected):
Section "Device"
Identifier "Card0"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
This step is replaced replaced above by acpi_backlight=intel_backlight
