Hi,
Maik Broemme <mbroemme@xxxxxxxxxxxxx> wrote:
> 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. :)
>
okay some other information, i am still able to set at least 15 of the
16 levels via '/proc/acpi/video/VID/LCD0/brightness' It shows:
root@bart:~# cat /proc/acpi/video/VID/LCD0/brightness
levels: 100 100 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100
current: 90
If i count all values (and the 100 only one time) it are 16 levels.
Well the level 100 i can not set (kernel is stock 2.6.22.6) Well this
looks like an ACPI bug for me, or a broken firmware. If do the
following:
root@bart:~# for i in 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 ; do sleep 1s ; echo "${i}" > /proc/acpi/video/VID/LCD0/brightness ; done
i can set at least 15 brightness level. I think the best solution would
be to use the ACPI video driver to set the brightness, did anyone agree
or disagree? :)
If i am correct thinkpad-acpi should trac the keypress event and then
trigger some acpi function to set the brightness level.
> 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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--Maik
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