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From: buytenh@wantstofly.org (Lennert Buytenhek)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] n2100: reduce power button timer to 1 Hz
Date: Mon, 28 Sep 2009 11:52:38 +0200	[thread overview]
Message-ID: <20090928095238.GI1773@mail.wantstofly.org> (raw)
In-Reply-To: <19134.29011.460366.960746@pilspetsen.it.uu.se>

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?

  parent reply	other threads:[~2009-09-28  9:52 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-26 19:53 [PATCH 2/2] n2100: reduce power button timer to 1 Hz Mikael Pettersson
2009-09-28  8:06 ` Aaro Koskinen
2009-09-28 10:30   ` Mikael Pettersson
2009-09-28 10:44     ` Aaro Koskinen
2009-09-28 11:26       ` Mikael Pettersson
2009-09-28  9:52 ` Lennert Buytenhek [this message]
2009-09-28 10:25   ` Mikael Pettersson

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