[ltp] Command to dim the LCD brightness

[Bob Alexander]

Tino Keitel wrote:
> In battery power mode, this may work with tpctl. This tool can switch
> between darker display and full brightness as in AC power mode when no AC
> power is connected.
> 

Tino,
tried looking the man for tpctl but could not understand how to do what 
you say.

> Maybe you can also use ibm-acpi, see the capter "CMOS control" and the
> LCD brightness parameters in <http://ibm-acpi.sourceforge.net/README>.
> 

Unforutnately in my specific model the echo values to lower/raise 
brightness change the OSD but not the actual luminosity :(

Thank you again very much,
Bob