Fwd: FW: Dell Latitude E7440 - ALPS touchpad keeps having state reset
From: Tommy Will <hidden>
Date: 2014-02-07 07:46:49
Hi Allan, This is Tommy from ALPS. Thanks for your contact and so sorry for my overlooking your last week's mail.
I've reported the problem I'm having in more detail here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258837 In summary - I keep suffering from the mouse pointer jumping around erratically, with the following messages output to syslog: psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Other people have reported the same problem in that bug report. Bisecting the kernel, the problem seems to have always been in place as soon as the touchpad was correctly identified; according to xinput - it's a "AlpsPS/2 ALPS DualPoint TouchPad". When it was being identified as a generic PS/2 mouse, there's no problem (though of course, there's also no touchpad functionality available either).
It seems that with the latest kernel, your touchpad became crazy erratically and almost cannot use? It looks like that our kernel driver did not let touchpad enter the correct mode or did not use the correct way to decode the raw data.
From another mail sent by Vasily, he met the same issue with touchpad
on Dell E7440 as yours. According to his touchpad info "E7: 73-03-0A EC: 88-08-22", I think we can start the investigation. Please give me some time and I'll feedback you later. Thanks! -- Best Regards, Tommy