[ltp] T61/intel: LCD brightness

[Theodore Tso]

On Sun, Oct 28, 2007 at 06:42:38PM -0200, Henrique de Moraes Holschuh wrote:
> On Sun, 28 Oct 2007, Marius Gedminas wrote:
> > Could it be that my laptop has 15 levels instead of 7, and I need a
> > thinkpad-acpi upgrade?  (I currently have thinkpad-acpi version 0.14,
> > according to modinfo.)
> 
> Yes.  Since you are using Ubuntu, you must use thinkpad-acpi 0.18. 0.14
> cannot handle 16 levels, because Ubuntu insists on messing with the display
> brightness through thinkpad-acpi.
> 
> You need a very recent kernel (2.6.22 recommended as 2.6.23.1 is broken),
> and thinkpad-acpi 0.18.

Also make sure you either have disabled CONFIG_ACPI_VIDEO, or build
thinkpad-acpi as module and then make sure it is loaded with the
parameter brightness_enable=1.

						- Ted