Hi, After booting Linux 2.6.28 the backlight control actions have now reversed, ie: attempting to make backlight brighter makes it dimmer and vice versa. The recent backlight changes (video vs. vendor) seem to have the result of allowing the ASUS F6S backlight hardware be driven via the acpi/video driver rather than the vendor/asus_laptop driver as per printk: asus-laptop: Brightness ignored, must be controlled by ACPI video driver Linux < 2.6.28 -------------- # cat /sys/class/backlight/asus-laptop/max_brightness 15 # Makes backlight brightest # echo 15 > /sys/class/backlight/asus-laptop/brightness # Makes backlight dimmest # echo 0 > /sys/class/backlight/asus-laptop/brightness Linux = 2.6.28 -------------- # cat /sys/class/backlight/acpi_video0/max_brightness 13 # Makes backlight brightest # echo 0 > /sys/class/backlight/acpi_video0/brightness # Makes backlight dimmest # echo 13 > /sys/class/backlight/acpi_video0/brightness A search for "linux 2.6.28 backlight" led to an Ubuntu bug report [1] which describes an ASUS notebook user with the same situation. [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/305935 Is it possible to have the ACPI video driver to behave correctly on this hardware? I'd like to provide any further required information. I've attached a bzip tarball containing: /sys/devices/platform/asus-laptop/infos /proc/acpi/dsdt dmesg output dmidecode output Thanks, Kel.
Attachment:
F6S.tar.gz
Description: application/tgz
