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Old 07-05-12, 09:17 PM   #2
brebs
Registered User
 
Join Date: Jul 2007
Posts: 38
Default Re: Screen backlight never goes off

The kernel 3.4 series seems to need:

acpi_backlight=legacy

In the bootloader's (e.g. grub, lilo, syslinux) commandline, so we can use e.g.:

Code:
echo 8 > /sys/class/backlight/acpi_video0/brightness
To check:
Code:
cat /proc/cmdline
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