[ubuntu] vgaswitcheroo -- permission denied

view story

http://ubuntuforums.org – Hi everyone, I'm using the guide for vgaswitcheroo that allows user access of graphic switching on a Lenovo T400. I have added this into /etc/rc.local (My username is derek): Code: chown derek /sys/kernel/debug/vgaswitcheroo/switch But my access to the "switch" file is still denied like this: Code: derek@Derek-Laptop:~$ ls -l /sys/kernel/debug/vgaswitcheroo/switch ls: cannot access /sys/kernel/debug/vgaswitcheroo/switch: Permission denied derek@Derek-Laptop:~$ sudo ls -l /sys/kernel/debug/vgaswitcheroo/switch -rw-r--r-- 1 derek root 0 Nov  2 13:36 /sys/kerne (Hardware)