hi, This is a duplicate of bug http://bugzilla.kernel.org/show_bug.cgi?id=12302 please try the patch at http://bugzilla.kernel.org/show_bug.cgi?id=12037#c5 thanks, rui On Sun, 2008-12-28 at 04:11 +0800, Kel Modderman wrote: > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
