the Power Management Daemon

[Dan Williams]

On Wed, 2007-04-04 at 01:29 -0300, Marcelo Tosatti wrote:
> On Mon, Apr 02, 2007 at 04:56:08PM -0600, Jordan Crouse wrote:
> > Hi Richard -
> > 
> > Power management is proceeding along nicely, and we're finally to the
> > point where we can start to discuss the design and implementation of the
> > OLPC Power Management Daemon.
> > 
> > We have started to list some possible real-world power management scenarios
> > here:
> > 
> > http://wiki.laptop.org/go/Power_Management_Scenarios
> > 
> > We should start to discuss how to go about implementing these in the power
> > manager - we have a bunch of eager B2 owners out there ready to start saving
> > power!  :)
> > 
> > Everybody, please feel free to comment on the page I linked above - we've
> > only defined those scenarios that are currently within our reach, but there
> > are others that we eventually want to support.
> 
> The userspace burn-CPU-madness which happens after resume is partially
> due to removal/addition of the eth0,msh0 and lo files in /sys/class/net,
> which in the end triggers ifdown/ifup and who knows what else

This is due to (I think) udev rules triggering the network service
in /etc/init.d/network.  That is actually not necessary if we're running
NetworkManager, which handles all that via HAL anyway.  So we can
'chkconfig --level 123456 network off' and it shouldn't be a problem any
more.

Dan

> inbetween. The down/up procedures are not necessary if this was a fast
> suspend/resume, but necessary if it was a long suspend/resume (so we
> possibly moved the machine to another access point network and need to
> rerun dhclient).
> 
> This should be handled by udev/HAL/PMD - need to get work on that
> started ASAP.
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