LCD backlight values

[Matthew Garrett]

The hal lcd brightness code currently seems to assume that all lcd 
brightness information is under /proc/acpi somewhere, which is not 
inherently the case (I've just written a couple of drivers for HP and 
Dell machines which expose it via sysfs). Should it not be the case that 
we unconditionally have an LCD object on laptops, and then conditionally 
provide brightness get/set routines?

For tablets, it might also be an idea to add a field for orientation. 
I've figured out how to get the orientation on a Toshiba tablet, but 
there doesn't really seem to be anywhere to put it at the moment.

-- 
Matthew Garrett | mjg59 at srcf.ucam.org