Request for feedback and/or participation on

Phil Knirsch pknirsch at
Wed Feb 4 16:04:56 UTC 2009

Bill Nottingham wrote:
> Phil Knirsch (pknirsch at said: 
>> In case you're interested in helping make power management better in F11  
>>  feel free to participate in any form.
> I'd really like to find a way to get all the things listed in Documentation
> set up automatically for the user where appropriate - we should have
> all this stuff by default.
> Bill

Thats a good point Bill.

Of course most of the first points are things that the user just needs 
to do himself (power off his machine, choose the right dimension for the 
work he's doing etc).

 From the pure system ones i know that we at least already use the 
ondemand by default as soon as the CPU supports it, so we should be fine 

Network card speeds and harddisk spindowns is a bit tricker imo, though 
we probably could enable a higher powersave mode for harddisk by default 
at least in case a user wants to save power. Some of this is/will be 
addressed by the tuned i'm working on which monitors the usage of 
network and harddisk devices and dynamically adapts the settings to the 
current use.

Laptop mode and a higher value for dirty_writeback_centisecs, there i'm 
personally torn a bit myself. I personally do use it on all my machines 
(laptop and desktop), but i can understand people who are a bit paranoid 
about their data integrity not wanting to have that by default. But i'd 
personally be all for going that way.

In regard to relatime from what i've found so far we seem to be doing 
that already by default it seems, though i'd like to have that verified.

Then disabling CD-ROM polling is definitely something for the ServerSIG, 
but on a default Desktop i think the user experience would suffer if we 
would do that by default.

Enabling USB autosuspend looks like a good candidate for being a default 
though. I've used it on quite a few Fedora 10 machines around here and 
haven't experienced any problems so far, so it seems to have matured 
enough by now from what i can see.

Last but not least the dpms off, i think that should definitely be part 
of the Desktop screensaver defaults, especially if you look at how much 
power a modern LCD display eats when it's only dimmed down to black.

Regards, Phil

Philipp Knirsch              | Tel.:  +49-711-96437-470
Team Lead Core Services      | Fax.:  +49-711-96437-111
Red Hat GmbH                 | Email: Phil Knirsch <pknirsch at>
Hauptstaetterstr. 58         | Web:
D-70178 Stuttgart, Germany
Motd:  You're only jealous cos the little penguins are talking to me.

More information about the fedora-devel-list mailing list