[ltp] Setting the brightness of the mute button LED

[Henrique de Moraes Holschuh]

On Sat, 20 Mar 2010, August Lilleaas wrote:
> the mute button of my T400s works (it mutes), but the LED on it doesn't.
> Here's "ls /sys/class/leds", neither of which controls the mute button LED.
> 
> mmc0:: tpacpi::power  tpacpi::standby tpacpi::thinklight
>  tpacpi::thinkvantage
> 
> Is there a way to make it shine, or am I out of luck?

Play with the OSI(Linux) stuff in ACPI.  Use the following kernel
parameters:

"acpi_osi=Linux" and "acpi_osi=!Linux"

One enables, the other disables OSI(Linux). I don't know what the kernel is
using on the T400s.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh