More advanced power savings (rev. the DPMS extension).

Alex Deucher alexdeucher at
Wed Jul 26 15:13:01 PDT 2006

On 7/26/06, Egbert Eich <eich at> wrote:
> Alex Deucher writes:
>  > >
>  > > Your case is rather special (at least for today's hardware).
>  > > I'm not convinced that adding this to DPMS is the way to go.
>  > > Depending on what you need (see above) you may want to create
>  > > a new extension. Apps can check if it is there and don't get
>  > > confused by the presence of DPMS but the absense of these
>  > > special features.
>  >
>  > some of the silicon motion chips have a similar mode.  It'd be nice to
>  > design an extension where we can dynamically change this since, at
>  > least on silicon motion, you have to disable the overlay, DAC, and
>  > some other features to enable the low power idle mode.
>  >
> In case of the silicon motion it would not keep the screen running.
> In this case the powerdown could actually happen on a DPMS event.
> I think a lot of mobile device chipsets have power save features
> and also some parts of the desktop chips can be disabled when not
> in use. We just have to learn how.

It does keep the flatpanel running, but in a sort of locked
self-refresh so you can power down the rest of the chip (ie, flatpanel
only, no DAC).


> Cheers,
>         Egbert.

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