debugging backlight issues

[Kamal Mostafa]

On Thu, 2010-06-17 at 11:05 -0400, David Tombs wrote:

> > param "acpi.brightness_switch_enabled=0" 
> 
> Do you know of any documentation for this?

No, I just observed it in the source -- It is present in Ubuntu kernel
source (Lucid onward, at least) but you're right, it does not in fact
disable acpi control of the backlight after all.

As Stefan recommended, acpi_backlight=vendor might be interesting to
you.  I find that it does disable acpi's control of the backlight on one
of my laptops but has no effect on another laptop.  (The laptop where it
has no effect is likely already using a vendor-specific backlight
driver.)

 -Kamal
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