** Changed in: linux (Ubuntu)
Status: Opinion => Confirmed
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https://bugs.launchpad.net/bugs/1634593
Title:
Elantech Touchpad detects as PS/2 BYD TouchPad or as a PS/2 generic
mouse
Status in linux package in Ubuntu:
Confirmed
Bug description:
I have an Elantech Touchpad installed on my Lenovo Y700 laptop and I
can't make it work properly by any means. I tried to switch between
libinput and synaptics but this bug seems to affect any driver.
Usually, after a system upgrade all works properly till the moment I
plug in external mouse (Razer DeathAdder 3500DPI). After that touchpad
detected as either PS/2 BYD or PS/2 generic mouse or sometimes PS/2
Elantech touchpad.
After some 5-6 reboots without plugging in external mouse the touchpad
finally starts to detect it as ETPS/2 Elantech touchpad.
Reloading psmouse module seems to cause no effect (or it does yet
after a minute touchpad stops working for a moment and then switches
to PS/2 in xinput). Multitouch stops working as well as tapping with
two fingers.
I tried almost all the possible workarounds involving adding boot
options, installing elantech driver fixes etc.
Help is appreciated.
The output of xinput as for now:
$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer
(2)]
⎜ ↳ PS/2 BYD TouchPad id=14 [slave pointer
(2)]
lsinput
/dev/input/event14
bustype : BUS_I8042
vendor : 0x2
product : 0x1
version : 99
name : "PS/2 BYD TouchPad"
phys : "isa0060/serio1/input0"
bits ev : EV_SYN EV_KEY EV_REL
UPDATE:
Seems that forcing the psmouse to detect the touchpad as elantech
helps to fix problem temporarily. But it works only from time to time:
$ sudo rmmod psmouse
$ sudo modprobe psmouse force="elantech"
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ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2016-08-27 (52 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
Package: linux (not installed)
Tags: xenial
Uname: Linux 4.6.0-040600-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
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