On Thu, 3 Dec 2009, Oliver Neukum wrote: > Am Donnerstag, 3. Dezember 2009 01:58:46 schrieb Justin P. Mattock: > > >> Now looking at dmesg I see: > > >> > > >> [ 413.551845] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 23 (level, low) > > >> -> IRQ 23 > > >> [ 413.551855] uhci_hcd 0000:00:1d.0: setting latency timer to 64 > > >> [ 413.551887] usb usb2: root hub lost power or was reset > > > > > > Is that unexpected? It seems reasonable to me.. > > > > honestly I can't remember seeing this or not. > > if this is normal then I'll leave it as is. > > This happens if your system cuts power to USB during S2. It also happens if the system retains power but resets the controller while resuming (as indicated by the log message: "lost power or was reset".) Again, it's a BIOS thing. And it seems to be very widespread. I haven't seen more than a handful of systems which _don't_ cut power or reset their UHCI controllers during S3 sleep. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
