[SOLVED] Brightness value not preserved across boots

NP_complete · Tux's lil' helper Joined: 21 Mar 2009 Posts: 137

Not sure if these two are connected, but everything started today after I sync'd the system. (They bumped the default Python version to 3.4). After reboot, the brightness level is always at its highest. It goes down when I manually adjust it in Gnome but gets reset after each boot. This may or may not be Gnome-related, so I posted this here instead of "Desktop Environments".

Previously, the brightness was being set during early stages of boot. Not anymore.

Many thanks!

PS I run kernel v. 3.16.5.

UPDATE (7/28 ) : According to Rui Matos, "Saving the brightness value between boots is done by systemd, see 'man systemd-backlight'." The manual entry says that the brightness value is saved by default. This is consistent with the old behavior.

Hieronymus Bosch · Posted: Thu Jul 30, 2015 12:11 am Post subject:

Look for this package : x11-apps/xbacklight

Check the amount of brightness that you desire then, you'll have to change something in .bashrc o .zshrc.

Add the following lines:

# Brightness

xbacklight -set 20

* The value depends on you.
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Details fueled any investigation ...

NP_complete · Tux's lil' helper Joined: 21 Mar 2009 Posts: 137

I did a kernel upgrade from v.3.16.5 to v.3.18.16, and it fixed it: https://github.com/systemd/systemd/issues/757