On Čt 05-01-06 17:55:33, Preece Scott-PREECE wrote:
> I shouldn't oversimplify the power management in a cell phone. When I said we turned whole devices on/off, I was referring only to what the system-level PM (which uses suspend/resume) does. There's a fair amount of subsystem-specific power management outside the Linux suspend/resume framework. Some of it might be handled in the framework, if the framework were more capable.
>
Ok, system-level PM is not interesting in this discussion.
You do runtime-powermanagement of devices, right? Let's take display
as an example.
(1) Do you have multiple display states like
on-fast: can refresh image every 10msec
on-slow: can only refresh image once per second, but takes less power
?
(2) Do you have multiple display states like
off-fast: display is off, user can not see anything, but it only takes
msec to wake up
off-slow: it takes 1 second for display to wake up, but it takes less
power
?
[Maybe display is bad example, but I can't think of better device with
complex power management]
Pavel
> scott
>
> -----Original Message-----
> From: Pavel Machek [mailto:[email protected]]
> Sent: Thursday, January 05, 2006 4:46 PM
> To: Preece Scott-PREECE
> Cc: Alan Stern; [email protected]; [email protected]; [email protected]
> Subject: Re: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface
>
> On Čt 05-01-06 17:21:38, Preece Scott-PREECE wrote:
> > We do have multiple system-level low-power modes. I believe today they
> > differ in turning whole devices on or off, but there are some of those
> > devices that could be put in reduced-function/lowered-speed modes if
> > we were ready to use a finer-grained distinction.
>
> I think we were talking multiple off modes for _single device_. It is good to know that even cellphones can get away with whole devices on/off today.
> Pavel
>
> --
> Thanks, Sharp!
--
Thanks, Sharp!
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