This post overwrites the tips I gave on this first one. On that post, the tip was start the laptop disabling a featured called “modeset”.
The problem is that disabling it makes the laptop slower and disable some other interesting features like GPU switching.
The second way I found, and the best one, is the following:
After the system is installed, press “e” when you get Grub screen when you boot it first time. A boot options editor will open and you should add the line below after the param quiet splash:
Press Crtl+X and the system will boot up.
After that, we need to block the automatic load of radeon module adding it to a blacklist. Open Gnome-terminal and type:
sudo gedit /etc/modprobe.d/blacklist.conf
In the end of the file, type:
Save it. After that, we need to make the system load the module in a second moment of the boot process. Type in gnome-terminal:
sudo gedit /etc/rc.local
After the line “# By default this script does nothing.” type this:
modprobe radeon chown root:plugdev /sys/kernel/debug/vgaswitcheroo/switch echo OFF > /sys/kernel/debug/vgaswitcheroo/switch exit 0
Save the file e reboot the system. This may be sufficient to the system work out without disabling radeon modeser.