On Sat, Sep 26, 2009 at 09:53:55PM +0200, Mikael Pettersson wrote:

The power button on the n2100 apparently does not generate
an interrupt when pressed, so the board support code sets
up a periodic timer to sample it.

This timer operates at 10 Hz, which makes it the third worst
cause of timeouts in my kernel when idle.

10 Hz seems excessive, so this patch adds a compile-time option
to reduce the polling frequency to 1 Hz.

How much power does this actually save?