hybrid-graphics-linux team mailing list archive

[Chloë Langley <chloe@xxxxxxxxxxxxx>]

On Thu, 28 Jul 2011 15:42:29 -0300
Joaquín Ignacio Aramendía <samsagax@xxxxxxxxx> wrote:

> >VGA-switcheroo is enabled but echo OFF says Permission denied (even
> with sudo).
> > 
> > $ cat /sys/kernel/debug/vgaswitcheroo/switch
> > 0:+:Pwr:0000:00:02.0
> > 1: :Pwr:0000:01:00.0
> 
> Try:
> $ su - (enter password)
> $ echo OFF /sys/kernel/debug/vgaswitcheroo/switch
> 
> The su command is in a way "stronger" than sudo.
> 

Alternatively, you can try:
$ sudo -s

This will give you a root shell without using su.

And do not forget the '>' character!
$ echo OFF >/sys/kernel/debug/vgaswitcheroo/switch