Date: Mon, 13 Dec 2004 13:10:52 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: nate@root.org Cc: rafan@infor.org Subject: Re: current powerstate and manually turn on/off? Message-ID: <20041213.131052.42773193.imp@bsdimp.com> In-Reply-To: <41BDF6A7.3040702@root.org> References: <20041213190604.GA81993@svm.csie.ntu.edu.tw> <20041213.121233.104111469.imp@harmony.village.org> <41BDF6A7.3040702@root.org>
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In message: <41BDF6A7.3040702@root.org>
Nate Lawson <nate@root.org> writes:
: Warner Losh wrote:
: >>By using sysctl, I do know what's the current powerstate
: >>of each device. I wounder is there any command or sysctl
: >>that can manually turn device on or off?
: >
: >
: > Not really, no.
:
: I think this is something the drivers should handle and we don't need to
: add user access to power states since it's probably the biggest way to
: shoot yourself in the foot. We already power down devices with no
: driver attached and once drivers get smart about powering down devices
: that are idle, this would cover all scenarios.
It would be nice to have a way to say "This is a really strong hint
that you are now idle, go to lowest power, highest latency to get out
of it mode."
Warner
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