On a Thinkpad T530, BIOS 2.07: Event 0x6050 is generated when there's a brightness change generated by the firmware (not from the kernel through _BCM). This only happens when the ACPI video driver is not loaded, or acpi_backlight=vendor. (actually, when _BCL has not been called). It should probably be ignored, like TP_HKEY_EV_BRGHT_CHANGED (0x5010). Whether _BCL has been called is stored in variable \NBCF. ACPI dump is here: http://www.bjencks.net/t530/acpidump.out.xz The full logic in the firmware appears to be: When a brightness key is pressed: If the key is unmasked: Report the key to thinkpad-acpi If _BCL has been called: Report the key (video event) to acpi video Else: Adjust the brightness Report event 0x6050 to thinkpad-acpi This results in correct behavior when acpi video is loaded, since thinkpad-acpi automatically masks the brightness keys in that case. However, without acpi video the keys are unmasked, so keypresses generate two brightness changes -- one from the firmware and one from userspace. It seems like the brightness keys should always be masked on this type of firmware. -Ben Jencks -- 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
