Bug 1051668 - Elantech touchpad (Asus TX201LA) recognized but works only as regular mouse on Kernel 3.12 -3.13
Summary: Elantech touchpad (Asus TX201LA) recognized but works only as regular mouse o...
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 20
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2014-01-10 20:37 UTC by Bugzy
Modified: 2014-06-16 23:29 UTC (History)
8 users (show)

Fixed In Version: kernel-3.14.7-100.fc19
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2014-06-05 21:52:00 UTC
Type: Bug

Attachments (Terms of Use)
Full Dmesg output (63.12 KB, text/plain)
2014-01-13 19:28 UTC, Bugzy
no flags Details
elan_touchpad.c from Android kernel (34.40 KB, application/x-download)
2014-02-11 23:57 UTC, Bugzy
no flags Details

Description Bugzy 2014-01-10 20:37:08 UTC
Description of problem:

On the new Asus Transformer Book Trio TX201LA Elantech touchpad works only as a mouse. Synaptics / multitouch features are not detected.

Version-Release number of selected component (if applicable):

Kernel version is 3.12.6-300.fc20.x86_64

How reproducible:

Steps to Reproduce:
1.reboot machine

Actual results:
Touchpad has only basic point, right-click, left-click functions and does not show up as a configurable multitouch device

Expected results:
Touchpad should be recognized as multitouch device w

Additional info:

--dmesg output shows:

psmouse serio4: elantech: unknown hardware version, aborting...
input: PS/2 Elantech Touchpad as /devices/platform/i8042/serio4/input/input61

--xinput list-props shows:

xinput list-props 'PS/2 Elantech Touchpad'
Device 'PS/2 Elantech Touchpad':
        Device Enabled (132):   1
        Coordinate Transformation Matrix (134): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        Device Accel Profile (258):     0
        Device Accel Constant Deceleration (259):       1.000000
        Device Accel Adaptive Deceleration (260):       1.000000
        Device Accel Velocity Scaling (261):    10.000000
        Device Product ID (250):        2, 1
        Device Node (251):      "/dev/input/event8"
        Evdev Axis Inversion (262):     0, 0
        Evdev Axes Swap (264):  0
        Axis Labels (265):      "Rel X" (142), "Rel Y" (143)
        Button Labels (266):    "Button Left" (135), "Button Middle" (136), "Button Right" (137), "Button Wheel Up" (138), "Button Wheel Down" (139)
        Evdev Middle Button Emulation (267):    0
        Evdev Middle Button Timeout (268):      50
        Evdev Third Button Emulation (269):     0
        Evdev Third Button Emulation Timeout (270):     1000
        Evdev Third Button Emulation Button (271):      3
        Evdev Third Button Emulation Threshold (272):   20
        Evdev Wheel Emulation (273):    0
        Evdev Wheel Emulation Axes (274):       0, 0, 4, 5
        Evdev Wheel Emulation Inertia (275):    10
        Evdev Wheel Emulation Timeout (276):    200
        Evdev Wheel Emulation Button (277):     4
        Evdev Drag Lock Buttons (278):  0

--cat /proc/bus/input/devices shows

I: Bus=0011 Vendor=0002 Product=0001 Version=0000
N: Name="PS/2 Elantech Touchpad"
P: Phys=isa0060/serio4/input0
S: Sysfs=/devices/platform/i8042/serio4/input/input69
U: Uniq=
H: Handlers=mouse1 event8 
B: EV=7
B: KEY=70000 0 0 0 0
B: REL=3

Comment 1 Josh Boyer 2014-01-13 15:39:38 UTC
Can you attach the full dmesg output please?

3.12.6 contains a backport of a patch in 3.13 to add support for newer Elantech devices, so you device must be even newer than that.

Comment 2 Bugzy 2014-01-13 19:28:23 UTC
Created attachment 849573 [details]
Full Dmesg output

I have attached the full dmesg output

Comment 3 Bugzy 2014-02-06 00:03:33 UTC
Just wondering if there is any new insight on this problem. I have tried out the vanilla kernel 3.13 at the Kernel Vanilla Repositories for Fedora with no success so I reverted back to the latest kernel in stable repo. After looking around and rummaging through the windows driver I haven't been able to discover anything of worth.

Comment 4 Bugzy 2014-02-11 20:58:17 UTC
It just occured to me that since this touchpad worked on android (ASUS TX201LA is a hybrid win8/android transformer), there had to be source code for the android kernel. Short story: I found the source code on ASUS's website (http://dlcdnet.asus.com/pub/ASUS/nb/TX201LA/Android_TX201LA_Kernel_Code_4_2.zip) and was able to locate the necessary files in the following directories

/drivers/input/mouse/elan_touchpad.c  (note: this file differs from the elantech.c typically found in the linux kernel)

I will try compiling the drivers against my present kernel later today to see if it works.

Comment 5 Bugzy 2014-02-11 23:57:28 UTC
Created attachment 862056 [details]
elan_touchpad.c from Android kernel

Some additional files from "/include/linux/" of the archive need to be copied over the source build directory such as

Compiling ended unsuccessful with lots of errors. Nevertheless, some useful information can be gathered from the elan_touchpad.c driver file (attached) such as:

#define ETP_INF_LENGTH			2
#define ETP_MAX_FINGERS			5

#define ETP_REPORT_ID		0x5d

#define HID_CMD_REGISTER	0x0005
#define ETP_CMD_REGISTER	0x0300
#define ETP_CTRL_REGISTER	0x0301

#define CMD_RESET			0x0100
#define CMD_WAKE_UP			0x0800
#define CMD_SLEEP			0x0801
#define CMD_ENABLE_ABS		0x0001

#define REG_DESC			0x0001
#define REG_REPORT_DESC		0x0002
#define REG_UNIQUE_ID		0x0101
#define REG_FW_VERSION		0x0102
#define REG_XY_TRACE_NUM	0x0105
#define REG_X_AXIS_MAX		0x0106
#define REG_Y_AXIS_MAX		0x0107
#define REG_RESOLUTION		0x0108

At this point, I have exhausted my non-existent skill in coding/compiling/debugging and gathering data so I will leave the rest in your capable hands and look forward to a response. Hope all the foot work thus far helps reduce the time and work required to fix the issue.

Comment 6 Benjamin Tissoires 2014-02-12 00:52:34 UTC
Hmm, you might want to give a try to the latest version of this kernel sent by Elan on linux-input LKML: https://patchwork.kernel.org/patch/3445601/
I will not push Dmitry to take this upstream given that it seems to be an i2c_hid device not binded to i2c_hid...
Anyway, giving a try does not cost too much :)

Comment 7 Bugzy 2014-02-12 06:09:53 UTC
@Benjamin Tissoires

Thanks. I got the patch and compiled the elan_i2c.ko module against my Fedora Kernel 3.12.10-300. While the make, depmod, and modprobe commands worked flawlessly, nothing happened (not even dmesg output). I am assuming that this may be caused by the fact that the psmouse/elantech module is built into the Fedora kernel; that is, I cannot simply remove the psmouse module and insert the elan_i2c one instead. I am guessing that there may be some way to bind the device to the proper driver, but I am in way over my head and I am not quite sure what I am doing. Can you let me know if my assumptions are correct?

Comment 8 Bugzy 2014-02-12 07:04:39 UTC
So I did the following

#Change bind mode to manual for the device
su -c 'echo -n "manual" /sys/bus/serio/devices/serio4/bind_mode'

# Unbind the device from psmouse driver
su -c 'echo -n "serio4" /sys/bus/serio/drivers/psmouse/unbind'

At this point mouse stops working and rightly so

# Bind device to elan_12c

su -c 'echo -n "serio4" /sys/bus/i2c/drivers/elan_i2c/bind'
Output is: write error: No such device.

I think that I understand what is going on. The tablet portion of the laptop (where Android resides) connects to the touchpad by i2c bus, but the dock portion (where linux resides) has the touchpad physically attached. Hence, linux sees it as a serio device whereas Android sees it as an i2c device. In other words, the driver that I provided earlier and the patch will not be useful for linux on the ASUS TX201LA dock portion. That driver will work only for laptops such as the ASUS TX300 and some of the VivoBooks.

This brings us back to the first post. The touchpad is detected only as a mouse on serio bus.

Comment 9 Neil 2014-02-17 08:54:27 UTC
This issue also occurs on newer Lenovo laptops. I have a z710 that also has this in dmesg:

psmouse serio1: elantech: unknown hardware version, aborting...psmouse serio1: elantech: unknown hardware version, aborting...

Comment 10 Bugzy 2014-05-12 01:33:15 UTC
It looks like there have been some recent updates to the elantech driver in Kernel 3.15 rc to add support for additional devices see 


When I get the opportunity, I will try one of the vanilla rc kernels at
and see whether it fixes the issue.

Comment 11 Bugzy 2014-05-13 18:25:28 UTC
Kernel 3.15-rc3 [1], specifically the patch [2] fixes the problem.

@Neil Can you try the latest mainline kernel at [2] and confirm that the problem is solved on your end as well?

@Benjamin Tissoires and @Josh Boyer
Is there any chace that we will see a backport of this patch for kernel 3.14.x in Fedora?

[1] https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/input/mouse/elantech.c?id=ae4bedf0679d99f0a9b80a7ea9b8dd205de05d06

[2] http://repos.fedorapeople.org/repos/thl/kernel-vanilla-mainline/fedora-20/x86_64/

Comment 12 Josh Boyer 2014-05-20 16:19:23 UTC
I added that patch to Fedora git for f19/f20.  It will be in the next build.

Comment 13 Fedora Update System 2014-06-03 03:41:35 UTC
kernel-3.14.5-200.fc20 has been submitted as an update for Fedora 20.

Comment 14 Fedora Update System 2014-06-03 03:42:36 UTC
kernel-3.14.5-100.fc19 has been submitted as an update for Fedora 19.

Comment 15 Fedora Update System 2014-06-04 07:53:33 UTC
Package kernel-3.14.5-200.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing kernel-3.14.5-200.fc20'
as soon as you are able to, then reboot.
Please go to the following url:
then log in and leave karma (feedback).

Comment 16 Bugzy 2014-06-05 14:43:39 UTC
Problem fixed as stated. I will get on q &a to vote later today if the kernel is not already in updates.

Comment 17 Fedora Update System 2014-06-05 21:52:00 UTC
kernel-3.14.5-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 18 Fedora Update System 2014-06-08 06:22:16 UTC
kernel-3.14.6-100.fc19 has been submitted as an update for Fedora 19.

Comment 19 Fedora Update System 2014-06-12 12:16:37 UTC
kernel-3.14.7-100.fc19 has been submitted as an update for Fedora 19.

Comment 20 Fedora Update System 2014-06-16 23:29:44 UTC
kernel-3.14.7-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

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