Re: Thinkpad R61i : Brightness Problem with Fn keys
>> But if in ROOT console i manipulate brightness through the proc file
>> system, then brightness is getting changed.
>>
>> This brings down brightness
>> echo 4 > /proc/acpi/ibm/cmos
>>
>> This brings up brightness
>> echo 5 > /proc/acpi/ibm/cmos
>>
>> During this too i am getting the GUI indication from the tpb module.
>>
>> Any suggestions on how to debug this?? I am using KDE 3.5.9
>
> you have some players here..
>
> first the "thinkpad_acpi" kernel module
> - it handles all your special buttons
> - it has tweaks for varios old configs like the /proc interface
> - it allows to modify how the buttons should work
>
> old model:
> - the kernel did nothing
> - the userspace polled with tools like tpd the state and changed it
> - not a good solution
>
> new model:
> - the kernel handels everything
> - userspace has to tell the kernel how it should be done
> here is your problem. the thinkpad_acpi module per default doesn't
> handle brightness, because the newer X servers in combination with hal
> should do it.
>
>
> so take a look at
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.26.y.git;a=blob_plain;f=Documentation/laptops/thinkpad-acpi.txt;hb=HEAD
> Line: 534, Compatibility notes
>
> --
> Florian Reitmeir
>
I suppose R61i has ACPI backlight control. But i compiled the kernel
with ACPI video enabled. Will that not take care of this issue? Is
there something to do with Root and User permissions?can u give more
inputs regarding section starting from line 607( Lenovo models *with*
ACPI backlight control) in the above text, like what steps i can do
to debug this?
Thanks and regards,
Umesh
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