Re: Run-time PM idea (was: Re: [linux-pm] [RFC][PATCH 0/2] PM: Rearrange core suspend code)

[Ray Lee]

On Mon, Jun 8, 2009 at 8:06 AM, Ingo Molnar<mingo@xxxxxxx> wrote:
>
> * Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote:

>> I'd like the kernel to expose this functionality but leave the
>> policy decisions to userland.
>
> The thing is, suspending something that is being used and relied on
> by an app is a _bug_. This is rather fundamental: hardware state and
> usage tracking is _NOT POLICY_.

Yes. But, actual example time: what about the case where completely
turning off a laptop's DVD drive saves extra power, but then also
turns off kernel and userspace notification of a disc being inserted?

One of the Other OS's handles this by having a popup when the battery
gets low, asking if it's okay to turn the drive off. This is part of
what Matthew is talking about here.
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