On Wed, 18 Apr 2007, Jiri Kosina wrote: > 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.
And to answer Jeroen's question: Yes, USB devices should be suspended automatically by the kernel when you suspend-to-ram. You don't need to do anything manually to suspend them. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
