I'm using hybrid graphics on my notebook. It has an integrated Intel and a discrete Radeon HD 6650M graphic card.
When I want to switch to discrete card, the screen freezes and I can't do anything.
/sys/kernel/debug/vga_switcheroo/switch to my username. But when I use the following command, the system freezes after restarting X:
echo DDIS > /sys/kernel/debug/vga_switcheroo/switch
My question is: How can I switch to the Radeon card?