brightness
The brightness of my laptop is reset to max on every restart. I tried the solution provided at this website but had no luck.
This command
cat /sys/class/backlight/acpi_video0/max_brightness
Returns
cat: /sys/class/backlight/acpi_video0/max_brightness: No such file or directory
Then I found that I don’t have a folder named acpi_video0
, but a folder called intel_backlight
:
Every time I increase or decrease the brightness using the brightness control keys, the values in brightness
and actual_brightness
get updated.
Is there any method I could follow to set the brightness to a fixed value on every boot and vary it as and when I need it using the brightness control keys?
Accepted Answer
You could try adding a line to /etc/rc.local that will set the desired brightness level. To edit the file, run
sudo -H gedit /etc/rc.local
and add the following
echo X > /sys/class/backlight/intel_backlight/brightness
so that the end result looks like this
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
echo X > /sys/class/backlight/intel_backlight/brightness
exit 0
Substitute X
by the desired brightness level.
In case /etc/rc.local doesn’t exist, as is the case with new Ubuntu releases, you’ll need to create it, and make eecutable with the following commands:
printf '%sn' '#!/bin/bash' 'exit 0' | sudo tee -a /etc/rc.local
sudo chmod +x /etc/rc.local
PS: Alternatively, there may be /sys/class/backlight/acpi_video0/brightness
instead of the above. Brightness levels vary wildly, and may range from 0 to 10 or to 1000. To find the maximum value, try
cat /sys/class/backlight/acpi_video0/max_brightness
or
cat /sys/class/backlight/intel_backlight/max_brightness
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