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I can not find /sys/kernel/debug/vgaswitcheroo/switch

I have enable switcheroo in kernel config . Why is there not /sys/kernel/debug/vgaswitcheroo/switch ? Linux ubuntu-raid-w500 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 UTC 2011 x86_64 ...