Debugging Backlight questions

[Stefan Bader]

On 03/01/2011 12:15 AM, Brian Murray wrote:
> I was reviewing https://wiki.ubuntu.com/Kernel/Debugging/Backlight and
> had a couple of questions.
> 
> 1) In the first bullet point it says - "This normally is not a problem
> in Linux."  Does this mean linux the kernel or something else?
> Additionally what course of action does the user in this situation take?
> 
It probably should say "there is nothing that the kernel could do about".
Basically, if the brightness adjustment is handled by the HW and there is no
ACPI or input event generated, then how should it generate OSD notifications?
I do not think a user can do much about that, than to accept that there is no
OSD feedback. Maybe there are way, but to find anything will require deep
knowledge about the system and HW.

> 2) Which systems does the thinkpad-acpi.brightness_enable option apply
> to?  I'd assume all Thinkpads but you never know.
>
All systems that automatically load the thinkpad-acpi module (which is basically
all ThinkPads but maybe a few Lenovo branded laptops, too).

Stefan

> Thanks!
>