Comment 13 for bug 428910

I know this is marked as fixed, but I am having what appears to be the same problem on an Acer aspire timelineX 1830T in karmic kubuntu, fully updated. I wondering if it is a regression or if this model needs another patch.

With either xbacklight or the hotkeys, no change is made.

After applying acpi_backlight=vendor to the grub config and rebooting, a backlight directory appears as: /sys/devices/platform/acer-wmi/backlight/acer-wmi/
actual_brightness
bl_power
brightness
device
max_brightness
power
subsystem
uevent

max_brightness is 9.
I can echo into brightness, and that number changes, but no effect in the display.
actual_brightness is always stuck at 0.