I think I found out in detail how to fix the slow FPS and the flickering.
sudo gedit /etc/default/grub
Edit this line to look exactly like this
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=1"
Save and close then run
sudo update-grub
Restart and pray.
Good luck
I think I found out in detail how to fix the slow FPS and the flickering.
sudo gedit /etc/default/grub
Edit this line to look exactly like this
GRUB_CMDLINE_ LINUX_DEFAULT= "quiet splash radeon.modeset=1"
Save and close then run
sudo update-grub
Restart and pray.
Good luck