This question is somewhat related to this question: Brightness is reset to Maximum on every Restart

Basically, I modified /etc/rc.local to set the brightness, as detailed in this answer, so on startup the brightness does get set to the correct value. However, when I suspend my laptop and wake it up, or simply close the screen and reopen it, the brightness gets reset to the maximum.

My machine runs Ubuntu 14.04 + Gnome 3. The machine is a Thinkpad X1 Carbon.

What's the solution?


For waking up from suspension, I create the following script /etc/pm/sleep.d/brightness:

case "$1" in
        echo 170 > /sys/class/backlight/intel_backlight/brightness

And the permission of the script is -rwxr-xr-x. This should also solve your problem.

But if the screen is dimmed, the brightness is set to maximum after recovering from the dimming.

This is really a bug which should be fixed.

I am using ubuntu 64 bit 14.04 with a Thinkpad T440s.

| improve this answer | |
  • Clarify my answer according to your suggestion. – Jingguo Yao Nov 1 '14 at 3:47

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.