Re: [linux-usb-devel] error to be returned while suspended

Oliver Neukum
2006-10-05T21:25:05Z

Am Donnerstag, 5. Oktober 2006 22:48 schrieb Alan Stern:
> On Thu, 5 Oct 2006, Oliver Neukum wrote:
[..]
> > If you freeze my batch jobs or make unavailable the servers
> > running on my laptop I'd be very unhappy.
> > But I want to make jostling a mouse or other input device safe. Thus
> > I want them to be suspended without autoresume. We need flexibility.
>
> So you want a mode in which the input devices are suspended without remote
> wakeup. Remote wakeup settings are configurable via
> /sys/devices/.../power/wakeup. At this point nobody has settled on a
> new API for suspending the devices. It's quite possible that different
> drivers or different buses will use their own individual APIs.

I have a few observations, but no solution either:
- if root tells a device to suspend, it shall do so
- the issues of manual & automatic suspend and remote wakeup are orthogonal
- there should be a common API for all devices
- there's no direct connection between power save and open()

The question when a device is in use is far from trivial.

Regards
Oliver