Comment 20 for bug 1290517

Description of my bug is mouse does not work at all. Device is elantech ETD0108. Laptop is Asus TP500LN. Dmesg gives "lost sync at byte 6" messages. Mouse does work with proto=imps parameter but no two-finger functionality. If this is the same with you, after sudo su try
echo 1 > /sys/devices/platform/i8042/serio4/reg_07
(or serioX?)
and see if it fixes the issue.

For at least asus TP500LN a kernel patch is under consideration
https://bugzilla.kernel.org/show_bug.cgi?id=84491
https://www.marc.info/?t=142731893400011
Many thanks to Ulrik de Bie!

Perhaps you can post on bugzilla that it affects your laptop too.