I use Xubuntu Linux
Brightness is good without using suspend mode but after using suspend mode I got problem with brightness It's lower than before ! I need your help
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Some Ubuntu laptops screen brightness reset to the lowest or highest on every boot and you have to configure the screen birghtness on every login.
To save the screen brightness settings in Ubuntu laptop.
Open a terminal window, and execute this command to edit /etc/rc.local:
sudo nano /etc/rc.local
Add this before the last line “exit 0″:
echo 5 > /sys/class/backlight/acpi_video0/brightness
number 5 is the value of your screen brightness. With this command check the maximum:
My m6700 use the disk from another PC, which has xubuntu 12.04.
I had the same problem then I downloaded the kernel from
and compiled using the command:
fakeroot make-kpkg --revision 00.m6700 --initrd --append-to-version=-localmod kernel-image kernel-headers
and then installed the generated packages by the command
dpkg -i *.deb, then after a reboot the problem was solved.
The Git branch I checkout out was:
Try modifying your /etc/default/grub file.
gksudo gedit /etc/default/grub
Edit the line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
sudo update-grub and reboot.