Hi,
Maik Broemme <mbroemme@xxxxxxxxxxxxx> wrote:
> 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.
>
Sorry a last thing which should be mentioned. :) The ACPI video driver
correctly updates the CMOS NVRAM, but thinkpad-acpi can only handle
values until acpi-video value 55, for example:
root@bart:~# echo 20 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 0
root@bart:~# echo 25 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 1
root@bart:~# echo 30 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 2
root@bart:~# echo 35 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 3
root@bart:~# echo 40 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 4
root@bart:~# echo 45 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 5
root@bart:~# echo 50 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 6
root@bart:~# echo 55 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 7
root@bart:~# echo 60 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 0
root@bart:~# echo 65 > /proc/acpi/video/VID/LCD0/brightness
root@bart:~# cat /proc/acpi/ibm/brightness | grep level:
level: 1
> > 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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