[SOLVED] init with predefined brightness

Hi

I successfully set the screen brightness to 50% with this console command...

 # echo 2000 > /sys/class/backlight/intel_backlight/brightness.

But I have to do this everytime I boot my laptop, which is several times per day. This is annoying. The default screenbrightness is 100%. And that is very bright, blindingly.

So, I created a script in rc.d, for automatically set the screen brightness...

# cat /etc/rc.d/rc.set-screen 

#!/bin/sh

echo 2000 > /sys/class/backlight/intel_backlight/brightness


# ls -ld /etc/rc.d/rc.kks 
-rwxr-xr-x 1 root root 71 May 16 13:40 /etc/rc.d/rc.kks

But init does not seem to be executing this file during boot up.

What am I doing wrong?

Thanks!

You need something to actually call your script. Either you can put an explicit call directly in the rc.local cript - or better yet, just add the above logic directly into rc.local.

From rc.M :

# Start the local setup procedure.
if [ -x /etc/rc.d/rc.local ]; then
  . /etc/rc.d/rc.local
fi

So, at the end of rc.M (or rc.local) add :

if [ -x /etc/rc.d/rc.whatever ]; then
  . /etc/rc.d/rc.whatever
fi

From my side:
1. it is overridden by some other command(s) later.
2. it is executed too early.
As far as I know the laptop (hardware) used to remember the brightness and restores it automatically.

Originally Posted by pan64 As far as I know the laptop (hardware) used to remember the brightness and restores it automatically.

I think on one of mine it's saved in CMOS, so if the CMOS battery is drained it's not saved.

My advice would be to use a custom udev rule to set it, which is what I do. Here's mine, as example...

/etc/udev/rules.d/81-backlight.rules:

# Set the initial backlight level.

SUBSYSTEM!="backlight", GOTO="backlight_end"
ACTION!="add", GOTO="backlight_end"

# Don't use the intel_backlight if the acpi backlight control is present:
TEST=="/sys/class/backlight/acpi_video0/brightness", GOTO="backlight_acpi"

KERNEL=="intel_backlight", ATTR{brightness}="364"

LABEL="backlight_acpi"
SUBSYSTEM=="backlight", KERNEL=="acpi_video0", ATTR{brightness}="39"

LABEL="backlight_end"

It may be worth looking through your bios settings first, before you go scripting a solution for init. My Dell laptop was always booting at 100% screen brightness by default until I found that menu in the bios and set it to 50% at startup. I believe it also had a setting for the keyboard back-lighting level too.

Originally Posted by GazL My advice would be to use a custom udev rule to set it, which is what I do. Here's mine, as example... /etc/udev/rules.d/81-backlight.rules: # Set the initial backlight level. SUBSYSTEM!="backlight", GOTO="backlight_end" ACTION!="add", GOTO="backlight_end" # Don't use the intel_backlight if the acpi backlight control is present: TEST=="/sys/class/backlight/acpi_video0/brightness", GOTO="backlight_acpi" KERNEL=="intel_backlight", ATTR{brightness}="364" LABEL="backlight_acpi" SUBSYSTEM=="backlight", KERNEL=="acpi_video0", ATTR{brightness}="39" LABEL="backlight_end"

That is great. It works! 364 is too dim on my Thinkpad. I changed it to 1500.