Bug 94981

Summary:	Kernel 4.0-rc4: ASUS Notebook Elantech Touchpad Completely Dead
Product:	Drivers	Reporter:	aljosa
Component:	Input Devices	Assignee:	drivers_input-devices
Status:	NEW ---
Severity:	high	CC:	admin, email, ferrandelmoral, spamminator, szg00000, ulrik_opensource-kernel
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	4.0-rc4	Subsystem:
Regression:	No	Bisected commit-id:

Description aljosa 2015-03-17 12:55:01 UTC

Hello,
I have just installed new 4.0-rc4 kernel inside Ubuntu 14.04.2, and the bad news is that touchpad is still completely dead on Asus notebook X750JN-TY027H (Intel® Core™ i7-4710HQ; Bit 64; RAM 8GB; Nvidia GeForce GT 840M). Even cursor is missing.

Here's the dmesg output:
pastebinit /var/log/dmesg
http://paste.ubuntu.com/10614968

Here's the xinput output:
⎡ Virtual core pointer                        id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                  id=4    [slave pointer  (2)]
⎜   ↳ Logitech USB Optical Mouse                  id=11    [slave pointer  (2)]
⎜   ↳ ETPS/2 Elantech Touchpad                    id=14    [slave pointer  (2)]
⎣ Virtual core keyboard                       id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard                 id=5    [slave keyboard (3)]
    ↳ Power Button                                id=6    [slave keyboard (3)]
    ↳ Video Bus                                   id=7    [slave keyboard (3)]
    ↳ Video Bus                                   id=8    [slave keyboard (3)]
    ↳ Sleep Button                                id=9    [slave keyboard (3)]
    ↳ USB Camera                                  id=10    [slave keyboard (3)]
    ↳ Asus WMI hotkeys                            id=12    [slave keyboard (3)]
    ↳ AT Translated Set 2 keyboard                id=13    [slave keyboard (3)] 

I have a lot of bad messages:

[   50.384607] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.410439] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.448864] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.475200] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.501551] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.501555] psmouse serio4: issuing reconnect request
[   50.731428] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.751783] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.776624] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.802973] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[   50.829317] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6 ...and so on...

Thanks in advance for any help.

Comment 1 Ulrik De Bie 2015-03-19 22:08:26 UTC

Can you try the follow command as root ?
echo 1 > /sys/devices/platform/i8042/serio4/reg_07

Does this help ?

Comment 2 aljosa 2015-03-20 10:52:14 UTC

Hello, I've replied to you here: 
https://bugzilla.kernel.org/show_bug.cgi?id=90841

Comment 3 tom 2015-04-02 09:45:54 UTC

hello, i have the same problem, my laptop is an ASUS f550ze-xx072h,

using the following command as root the trackpad start working immediatly:
echo 1 > /sys/devices/platform/i8042/serio4/reg_07

Comment 4 Roy Bellingan 2015-07-22 20:03:31 UTC

Similar hardware, similar problem and same fix for me too.

Comment 5 Adrien DAUGABEL 2015-12-28 10:29:28 UTC

Same problem with Calculate Linux kernel 4.2.8.

The command **echo 1 > /sys/devices/platform/i8042/serio4/reg_07** solves the issue.

Comment 6 ferrandelmoral 2017-12-27 15:44:21 UTC

Same touchpad, same problem. BUt when running the command all I got is "bash: /sys/devices/platform/i8042/serio4/reg_07: Permission denied". (I am running the command as a root)