Re: [patch] pm: fix runtime powermanagement's /sys interface

Alan Stern
2006-01-04T22:06:09Z

[-- Attachment #1: Type: TEXT/PLAIN, Size: 980 bytes --]

On Wed, 4 Jan 2006, Pavel Machek wrote:

> > As I mentioned in the thread (currently happening, BTW) on the linux-pm
> > list, what you want to do is accept a string that reflects an actual state
> > that the device supports. For PCI devices that support low-power states,
> > this would be "D1", "D2", "D3", etc. For USB devices, which only support
> > an "on" and "suspended" state, the values that this patch parses would
> > actually work.
>
> We want _common_ values, anyway. So, we do not want "D0", "D1", "D2",
> "D3hot" in PCI cases. We probably want "on", "D1", "D2", "suspend",
> and I'm not sure about those "D1" and "D2" parts. Userspace should not
> have to know about details, it will mostly use "on"/"suspend" anyway.

It would be good to make the details available so that they are there when
needed. For instance, we might export "D0", "on", "D1", "D2", "D3", and
"suspend", treating "on" as a synonym for "D0" and "suspend" as a synonym
for "D3".

Alan Stern

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]