http://bugzilla.kernel.org/show_bug.cgi?id=12249





------- Comment #6 from tetrom...@gmail.com  2008-12-18 19:52 -------
Created an attachment (id=19368)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19368&action=view)
dmesg output

(In reply to comment #5)
> Never trust the brightness value read from "brightness"
> If you want to get the current backlight level, run "cat
> /sys/class/backlight/acpi_video0/actual_brightness"

Doesn't work, /sys/class/backlight/acpi_video0/actual_brightness always says 0,
no matter what the brightness is.

> please kill acpid, and run "cat /proc/acpi/event"
> attach the output after pressing the brightness up/down hotkey.

Each time I press "brightness down", cat /proc/acpi/event prints
video LCDD 00000087 00000000

Each time I press "brightness up", it prints
video LCDD 00000086 00000000
(even when it rolls over and decreases the brightness again).

> please attach the dmesg output as well.

There is nothing new added to dmesg when I change the screen brightness. For
reference, here is the complete dmesg output (the "Lenovo SL series driver" is
a driver for the multimedia hotkeys that I am writing at the moment).


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