Re: T440s Synaptics clickpad: lost sync / KBC bad data

[Vadim Fint <mocksoul@gmail.com>]

Hello!

I was having exactly the same issues with brand new T440s from Lenovo. psmouse 
get lost sync every time I did a physical click on clickpad.

But for me that was HW issue: after disassembling notebook I saw touchpad 
cable was not snapped into touchpad at all. Because latch (with cable) moves 
2-3mm each click -- what was bad contact during that.

To deal with that issue I did removed only internal battery pack and locked a 
cable on touchpad with a screwdriver :) (15-20 minutes for whole operation)

Dont know what Windows internaly do with synaptics protocol, but there was no 
issues in Windows at all (but in recovery mode clickpad was not working at 
all).

Anyway, no problems in Gentoo with 3.12-3-pf kernel for me now! And no more 
that weird “out of sync” messages from psmouse at all.

Hope this helps!!

> Hello everyone,
> 
> I hope I'm at the right address here with my problems. If not, please do
> point me in the correct direction.
> 
> I have a Lenovo Thinkpad T440s with a Synaptics clickpad and an IBM
> trackpoint in it:
> 
> input: PS/2 Synaptics TouchPad as
> /devices/platform/i8042/serio1/input/input120 psmouse serio1: synaptics:
> Touchpad model: 1, fw: 8.1, id: 0x1e2b1, caps: 0xd001a3/0x940300/0x127c00,
> board id: 2668, fw id: 1293989 psmouse serio1: synaptics: serio: Synaptics
> pass-through port at isa0060/serio1/input0 input: SynPS/2 Synaptics
> TouchPad as /devices/platform/i8042/serio1/input/input123 psmouse serio34:
> alps: Unknown ALPS touchpad: E7=10 00 64, EC=10 00 64 psmouse serio34:
> trackpoint: IBM TrackPoint firmware: 0x0e, buttons: 3/3 input: TPPS/2 IBM
> TrackPoint as /devices/platform/i8042/serio1/serio34/input/input124
> 
> The problem is that the trackpoint behaves incredibly erratic, sometimes
> working correctly for minutes at a time, sometimes just jumping around and
> many times just hanging. I need to remove and re-insert the psmouse module
> to solve that. Alongside this behaviour, my kernel log also is getting
> spammed with messages like:
> 
> psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
> psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
> psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
> psmouse serio1: TouchPad at isa0060/serio1/input0 - driver resynced.
> and psmouse serio1: bad data from KBC - timeout
> 
> What I've tried:
> - Tried the kernel options i8042.nomux=1 and i8042.reset=1
> - Disable acpi by passing acpi=off to the kernel
> - Disabled CPU frequency scaling
> - Trying other protocols, e.g. by doing modprobe psmouse proto=imps or
> proto=bare - Switching from vanilla 3.12 kernel to both the latest&greatest
> kernel from Linus' Git and an antique 3.1.0 kernel - Turning on
> i8042.debug. To my untrained eye, it looks like bytes of PS/2 data are just
> disappearing when the 'lost sync' messages kick in. I can give an example
> of that if needed.
> 
> Strangely, the symptoms have been getting worse in the 10 days I've had this
> machine: from the first few days with no trouble to today with the mouse
> crapping out almost once every ten seconds or so. I would say it's a DOA
> and claim my warranty, if not frustratingly the machine works perfectly
> fine in Windows 8, with no touchpad trouble at all.
> 
> I'm willing to try things on this machine, run patches or take any hint in
> what I can change to get this working; if it helps I can even poke an
> oscilloscope at the PS2 lines. Not having a working touchpad or touchpoint
> is getting a bit frustrating...
> 
> Cheers,
> Jeroen

--
Regards,
Vadim Fint,
Moscow, Ru.
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