On Sunday 15 July 2007, Dave Jones wrote: > On Sun, Jul 15, 2007 at 08:07:01PM -0700, David Brownell wrote: > > On Sunday 15 July 2007, Dave Jones wrote: > > > > > Before I dig deeper, are there other side-effects of changing > > > this default ? > > > > Other than spending more power than necessary? :) > > > > I don't think there should be, but Alan's most on top of these > > particular issues. The main thing I'd worry about is root hubs, > > which may be performing undesirable periodic DMAs (1/msec or more > > often) if they aren't allowed to suspend their downstream links. > > (Called, misleadingly, "global" suspend even though it's limited > > to a single USB bus.) > > Would this be any different from the status quo of having > CONFIG_USB_SUSPEND not set though ? We've had this disabled until > now, without notable bad effects (or at least, nothing that we've > attributed to having this off).
I'll let Alan Stern answer that. At one point the answer was "no", but root hub behavior has changed since then. (That's ignoring the obvious difference of being able to selectively enable autosuspend. And by the way, if you turn this off ... I sure hope you're putting a device database in place which can turn it back on for devices for which USB suspend is known to work!) > > I think we've been finding out a consequence of Microsoft's rarely > > using the USB suspend mode: devices don't get tested with it, so > > many of them don't support it correctly. > > I'm shocked ;-) As are all of us here at the asylum, every Sunday evening! ------------------------------------------------------------------------- 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/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
