All the relevent information should be available in the launchpad bug report (Bug 1093237). https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1093237 jason@jason-Inspiron-7720:~$ dmesg | grep Unknown [ 20.512553] psmouse serio1: alps: Unknown ALPS touchpad: E7=73 03 50, EC=73 02 02 jason@jason-Inspiron-7720:~$ uname -a Linux jason-Inspiron-7720 3.11.0-031100rc4-generic #201308041735 SMP Sun Aug 4 21:36:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Seems to be resolved in the commit 2013-12-26 Input: ALPS - add support for "Dolphin" devices I am not sure if the device is really considered a "Dolphin" device however it seems to work and has no issues that I know of or have experienced. The following snippet shows the change to now match the existing ec sequence by correctly matching the second byte. @@ -1845,11 +1975,13 @@ static int alps_identify(struct psmouse *psmouse, struct alps_data *priv) if (alps_match_table(psmouse, priv, e7, ec) == 0) { return 0; } else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 && - ec[0] == 0x73 && ec[1] == 0x01) { + ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {