Some information about setting brightness on X61 Tablet with 16 levels.

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Hi,

i have a couple of small questions. :) I own an IBM ThinkPad X40 and a
Lenovo ThinkPad X61 Tablet and just hacked somewhere around in the
'thinkpad-acpi-0.16-20070904' sources.

I started my work on adding support for the brightness setup which has
16 level on the newer X61/X61s and X61 Tablet laptops. Well my problem
is (or i am to stupid to understand) that setting the brightness level
with TP_CMOS_BRIGHTNESS_UP did not set it until level 16. Is this a
limitation of the thinkpad-acpi itself or somewhere inside the NVRAM?

As notice: With brightness mode 1 (which reads data from EC via
acpi_ec_read) the setting of any brightness level is not working.

Maybe someone can give me a hint where i can start to track this issue
and how to solve it. :)

Another thing i mentioned is that the FN+F7 (switching LCD, LCD+CRT,
CRT) button did not work, also the 'echo "crt_enable" >
/proc/acpi/ibm/video' did not work. I have tried several kernel
configurations with that:

CONFIG_ACPI_VIDEO=y|n
CONFIG_BACKLIGHT_CLASS_DEVICE=y|n

However none of the configuration makes me able to switch LCD/CRT, the
ACPI Video support gives me the following at boottime:

ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)

Well i am very new to ACPI stuff, so sorry for the _maybe_ stupid
questions. ;)

All the FN+ keys give me an ACPI event via /proc/acpi/event

FN+F7:		ibm/hotkey HKEY 00000080 00001007
FN+Pos1:	ibm/hotkey HKEY 00000080 00001010
FN+End:		ibm/hotkey HKEY 00000080 00001011

Additionally if the ACPI video driver is loaded i got two more ACPI
events:

FN+Pos1:	video LCD0 00000086 00000000
FN+End:		video LCD0 00000087 00000000

--Maik

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