I have a Macbook2,1 with Ubuntu 12.04. When I start the computer the back light is on and I can see all of the boot stuff. Once the GUI begins to start up the backlight is turned completely off and I can not see anything. I do however hear the little ubuntu drum beat, can then type my password and log on. Once I have done this I can then use the brightness buttons to turn the brightness back up but the logon screen is always just blackness.
I can control the brightness from the command line using
echo 500 | sudo tee /sys/class/backlight/intel_video/brightness
and I put this line into /etc/rc.local before the exit 0 but this doesnt do anything.
How can I get the brightness back up when the GUI starts up?
Best Answer
The following worked for me:
grep acpi_video /var/log/Xorg.0.log
cat /sys/class/backlight/acpi_videoX/brightness
, substitutingX
for the ACPI number found on step 1Create a
fixbrightness.conf
file: rungksu gedit /etc/init/fixbrightness.conf
and paste the following, replacingBRIGHTNESS_VALUE
with the number gotten from the previous step andX
for your ACPI interface number:Save and reboot.
Source: http://www.webupd8.org/2014/10/fix-brightness-getting-reset-to-very.html