Hi all, I'm having the same issue with a Lenovo T440p. The "lost sync" messages occur if packets sent by the touchpad don't respect the bitmasks specified in [1]. Adding some more debug output to the driver reveals, that packages are garbled in a fairly random pattern, so just using the less enforcing "SYN_NEWABS_RELAXED" bitmask (drivers/input/mouse/synaptics.c:1165 , in accordance to manual section 6.1 last bullet point) does not help. Neither does cutting the packet rate in halve or deactivating all wireless devices (=> not an interference problem). As far as I can see, sleep flags are never set by the driver, thus no luck with that either. Interestingly my BIOS offers a switch to deactivate the touchpad and just use the trackpoint. This however doesn't work either. As soon as I trigger some (especially multi touch) activity, the touchpad comes back and causes trouble. I believe the switch triggers pass-through mode described in manual [1] section 5.3 and: > A spontaneous reset of the TouchPad, due to internal sanity checks, > ESD, or some other problem, will take the device out of transparent > Pass-Through mode Disabling the touchpad caused trouble for the Windows driver [2], too: > <16.3.15.2> > - (New) Fixed an issue where touchpad was still enabled after having > been disabled by BIOS. I was able to reproduce the bug in the Windows 8 Professional installer, the Debian 7.1 installer, the live CD version of the Ubuntu 14.04 (Trusty Tahr) daily build (14.01.2014, kernel 3.13.x) and my installed Gentoo system (kernel 3.12.7). I'm not sure, but I think the touchpad was acting a bit jumpy (but no where as bad) in the pre-installed version of Windows 7 Professional as well. For now I'm using the Bios switch to disable the touchpad in combination with the psmouse module parameter "proto=exps". This allows me to just use the trackpoint with a primitive ps2 mouse driver and leave the touchpad disabled (at least if I'm careful enough not to accidentally rest my palm on it). Being not careful enough however still causes it to wake up and to inject timeout and bad parity errors, triggering the cursor to jump around, click aimlessly and finally to hang. As soon as I can afford to be without the laptop for a few days, I'll ask Lenovo to replace the touchpad. I don't want to lose my warranty, otherwise I'd open the notebook [3] and check if perhaps the cables are not in place or broken. I'll also report back here, if there is anything new. Greetings, Jan [1]: Synaptics PS/2 TouchPad Interfacing Guide. http://www.synaptics.com/sites/default/files/511-000275-01_RevB.pdf [2]: Synaptics ThinkPad UltraNav Driver. http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/gggx45ww.txt [3]: Video training for Lenovo T440p servicing. http://lenovoservicetraining.com/content/CourseWarePublic/22088/player.html -- 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
