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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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  • What version of Ubuntu?
    – david6
    Nov 21, 2011 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, 2012 at 19:10

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