Unable to adjust brightness on a Sony Vaio

Question

I am having a Sony Vaio SVE1513BYN. I have installed Ubuntu 13.10 . Once I set brightness of my laptop and then after I restart my laptop it is changed. Brightness is going full as default.

Answer 1

Edit the file /etc/default/grub. You can do this by going to the terminal and typing:

sudo gedit /etc/default/grub

Change the line:

GRUB_CMDLINE_LINUX=""

to

GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux acpi_backlight=vendor"

and then save and then run:

sudo update-grub

Then restart the computer, then it should work.

Answer 2

You could try adding a line to /etc/rc.local that will set the desired brightness level. To edit the file, run

gksudo 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 the X by the desired brightness level.

source:Brightness is reset to Maximum on every Restart