Re: Problem in changing permissions for a directory

[Gabriel Philippe <gabri.philippe@gmail.com>]

On Thu, Apr 30, 2015 at 5:19 PM, Sebastian Kapfer <sebastian.kapfer@fau.de> wrote:

those are virtual directories, which don't really exist on the hard disk.
They're just simulated by the Linux kernel, and it wouldn't make a whole
lot of sense to change their permissions.  Actually, if you could change
permissions under /proc, chances are you might break something ;-)

On my laptop I'm very happy to be able to change the permissions of files in /sys (which are quite similar to files in /proc, at least for what we use them for).

Example, run at startup:
    chown root.me /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness
    chmod g+w /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness

Thanks to that I can change the brightness with a small script, without being root or using awfully big and complicated SUID programs.