linux-kernel - Re: [PATCH 2/4] lis3: remove automatic shutdown of the device

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Date:	Thu, 21 May 2009 13:55:11 +0200
From:	Éric Piel <eric.piel@...mplin-utc.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] lis3: remove automatic shutdown of the device

Op 21-05-09 13:36, Pavel Machek schreef:
> Hi!
> 
>> After measurement on my laptop, it seems that turning off the device
>> does not bring any energy saving (within 0.1W precision). So let's keep
>> the device always on. It simplifies the code, and it avoids the problem
>> of reading a wrong value sometimes just after turning the device on.
> 
> Well, 0.1W is still quite much for cellphone etc... but as we do not
> have any such small users in the tree, I guess this can go in...
> 
Yes. BTW, what I meant is that the power consumption on my laptop can be
read with 0.1W precision. Turning on and off the device showed 0.0W
variations. The device should using even much less than 0.1W. According
to the documentation, it's about 2.2mW when on and 3µW when off.

Eric


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