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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.

I chowned /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?

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closed as too localized by Stefano Palazzo Jan 27 '12 at 10:57

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

What version of Ubuntu? – david6 Nov 21 '11 at 23:17
Exact same case for me. I logged a bug at the linux kernel bug tracker and the Ubuntu bug tracer. Does not seem to make any difference though. It has not been updated for half a year now. – W. Goeman May 31 '12 at 19:10