On Wed, 2013-07-03 at 22:27 +0100, Frederick van der Wyck wrote: > +#define EC_HID "PNP0C09" This is probably wrong - you should be able to just use first_ec directly rather than probing yourself. > + for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) { > + status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL); The potential problem here is that there's no guarantee that these event numbers are stable, and a firmware upgrade could change them. Of course, that's also true of the EC registers, but we haven't had anyone complain about the driver suddenly breaking so I'm not hugely enthusiastic about replacing one fragile but seemingly working method with a fragile but unproven one. -- Matthew Garrett <mjg59@xxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html