permissions on /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

permissions on /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

[anders]

Hi,

I'd like for a selected group of users to be able to change the frequency.
However, /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed is:

-rw-r--r--  1 root root 4096 Jan 18 11:24 scaling_setspeed

What's the best way to change that to another group and g+w ? (and no, I don't
want to fiddle with sudo...)

/Anders

Re: permissions on /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

[Dave Jones]

On Wed, Jan 18, 2006 at 11:34:23AM +0100, anders@latitude.mynet.no-ip.org wrote:

 > I'd like for a selected group of users to be able to change the frequency.
 > However, /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed is:
 > 
 > -rw-r--r--  1 root root 4096 Jan 18 11:24 scaling_setspeed
 > 
 > What's the best way to change that to another group and g+w ? (and no, I don't
 > want to fiddle with sudo...)

it's not really designed to be used on a per-user basis.
How can it be ?  Imagine one user wants to set the speed low, whilst
another wants it high.

		Dave

Re: permissions on /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

[Mattia Dongili]

On Wed, Jan 18, 2006 at 11:34:23AM +0100, anders@latitude.mynet.no-ip.org wrote:
> 
> Hi,
> 
> I'd like for a selected group of users to be able to change the frequency.
> However, /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed is:
> 
> -rw-r--r--  1 root root 4096 Jan 18 11:24 scaling_setspeed
> 
> What's the best way to change that to another group and g+w ? (and no, I don't
> want to fiddle with sudo...)

you could install cpufrequtils and play with the suid bit and g/o
permissions for cpufreq-set, eg:

-rwsr-x---  1 root cpufreq 11976 2005-12-20 22:52 /usr/bin/cpufreq-set

But Dave is right, it doesn't make much sense.
-- 
mattia
:wq!

Re: permissions on /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

[anders]

malattia@linux.it said:
> you could install cpufrequtils and play with the suid bit and g/o permissions
> for cpufreq-set, eg:
>
> -rwsr-x---  1 root cpufreq 11976 2005-12-20 22:52 /usr/bin/cpufreq-set
>
> But Dave is right, it doesn't make much sense. --

Ah, of course, that would work! (This is a single-user laptop so the
multi-ambition problems of a real multi-user system aren't there).

Thanks,
/Anders