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I often use my computer in text-only mode, so no X11, no window manager, etc. I'd like to be able to adjust the screen brightness of my laptop while in text mode, which I can do by writing to the file

/sys/class/backlight/intel_backlight/brightness

In order to write to the file, I either run the command through sudo or change the permissions for the brightness file.

I'd like to write a script which will change the brightness by increments, for which I would need permanent write access to the brightness file. Unfortunately, since it's in /sys, it's generated dynamically every time I boot up, so I need to change the file's permissions every time I restart.

I gather that I can change the permissions permanently by writing a udev rule, which I've never done before. Would that be the best way to achieve what I'm trying to do, or is there a safer alternative? For example, putting something in rc.local, using cron, etc.

  • udev rules are more complex than a single echo command in rc.local. You seem to already know the answer to your own question, more or less. – Larssend Jul 18 '15 at 4:35
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I would use the rc.local method simply because it is easier and simpler than writing and maintaining a custom udev rule. You might also have to write a script that re-applies the permissions upon resuming from suspend and hibernation. Such script should be put in /etc/pm/sleep.d/ (requires pm-utils), if needed.

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