Hi Dmitry: Got the official info from Lenovo: Lenovo introduced new TrackPoint compatible sticks ( ELAN/Alps/NXP sticks) from 2016. These new devices only support the minimum commands described in the spec, which has been used in the current Windows driver. Legacy TrackPoint: 0101 – 0E01 ALPS: 0102 – FF02 ELAN:0103 – FF03 NXP: 0104 – FF04 2.4.18 READ SECONDARY ID (x"E1") This command will read the secondary device ID of the pointing device (2 bytes). The least significant byte is sent first. For the first byte, the legacy TrackPoint controller from IBM will always return x"01", the pointing stick from ALPS will always return x"02", the pointing stick from Elan will always return x"03”, and the pointing stick from NXP will always return 0x”04". And a second byte which denotes a specific set of functional specifications. Differing ROM versions are used to denote changes within a given functional set. The new devices (include Legacy ID:01) will not support the sysfs like speed. So it is not right to revert the commit, it is about to add another 0x04 ID in it. Old sysfs could be stayed for old legacy device ID:01 or removed. Aaron -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
