0x3003 Bay ejection (see 0x2x05) complete, can sleep again
0x4003 Undocked (see 0x2x04), can sleep again
+0x5009 Tablet swivel: switched to tablet mode
+0x500A Tablet swivel: switched to normal mode
+0x500B Tablet pen insterted into its storage bay
+0x500C Tablet pen removed from its storage bay
0x5010 Brightness level changed (newer Lenovo BIOSes)
The above events are propagated by the driver.