Re: current state of USB SUSPEND?

On Wed, 18 Apr 2007, Jeroen Janssen wrote:

> I noticed several recent USB SUSPEND related patches on this mailinglist 
> and I was wondering if someone could tell me what the current state of 
> USB SUSPEND is. Should USB devices be suspend 'automaticly' (by the 
> kernel) when suspending to ram? Or do I need to manually suspend the 
> devices somehow?

Hi Jerome,

USB suspend is not closely related to suspending of the system 
(swsusp/acpi). USB suspend is independent, and allows for USB-specific 
suspending of devices that have not been recently used, to reduce power 
consumption. The USB_SUSPEND feature has been present in mainline kernel 
for quite some time, under CONFIG_USB_SUSPEND option.

The patches that have been discussed lately here were related to some 
changes of the usb suspend architecture, allowing per-device specification 
of timeout before putting device to suspend, etc.

-- 
Jiri Kosina

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