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Old 12th August 2012, 10:51 AM
elyazalmahfouz Offline
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Join Date: Jan 2011
Posts: 6
No /sys/kernel/debug/vgaswitcheroo/switch file

I have recently installed fedora 17 and I can't find the file /sys/kernel/debug/vgaswitcheroo/switch which I will need to be able to switch between the two graphics cards on my system, any clue?

Thanks for your help,
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Old 13th August 2012, 03:11 PM
droidhacker Offline
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Join Date: Oct 2009
Posts: 824
Re: No /sys/kernel/debug/vgaswitcheroo/switch file

Are both graphics cards enabled? Assuming that one of the GPUs is integrated (which I believe to be mandatory), there should be a configuration option in the bios to select between "integrated" and "switchable".
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Old 13th August 2012, 06:48 PM
flyingfsck Offline
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Join Date: Aug 2010
Location: Al Ain, UAE
Posts: 2,006
Re: No /sys/kernel/debug/vgaswitcheroo/switch file

Do you mean that xrandr doesn't work?
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Old 13th August 2012, 08:02 PM
Posts: n/a
Re: No /sys/kernel/debug/vgaswitcheroo/switch file

It's there - you likely don't have your hardware enabled in the BIOS.

[stevea@crucibulum kernel]$ uname -r
[stevea@crucibulum kernel]$ cat /sys/kernel/debug/vgaswitcheroo/switch
0: DIS: :Pwr:0000:01:00.0

Originally Posted by flyingfsck View Post
Do you mean that xrandr doesn't work?
xrandr is for changing and configuring interfaces ,not GPUs.
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dual graphics, file, vgaswitcheroo

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