Quote:
Originally Posted by encol
One noticeable difference: the "lipc" method mantains light off also after screensaver, the "echo" method does not
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Which is reasonable.
The "echo" method is changing the value of an internal kernel variable.
What some might call a 'poke' function.
The 'lipc' method is most likely also updating 'state' information within the software system (in addition to poking the kernel).