Bug 195669 - Touchpad not detected on Lenovo S21e
Summary: Touchpad not detected on Lenovo S21e
Status: RESOLVED CODE_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Input Devices (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_input-devices
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-05-05 09:04 UTC by Rob van den Berg
Modified: 2019-03-29 00:47 UTC (History)
3 users (show)

See Also:
Kernel Version: 4.11.0-041100-generic
Subsystem:
Regression: No
Bisected commit-id:

Attachments
lshw (11.93 KB, text/plain)
2017-05-05 09:04 UTC, Rob van den Berg 		Details
dmesg (124.51 KB, text/plain)
2017-05-05 09:05 UTC, Rob van den Berg 		Details
devices (2.60 KB, text/plain)
2017-05-05 09:07 UTC, Rob van den Berg 		Details
add the ELAN0601 ID (838 bytes, patch)
2019-02-25 19:52 UTC, Vincent Batts 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

Description Rob van den Berg 2017-05-05 09:04:20 UTC 
Created attachment 256219 [details]
lshw

OS Kubuntu 17.04
Kernel 4.11.0-041100-generic (mainline)
The touchpad isn

I've tried several kernel paramaters

i8042.nomux=1
i8042.reset=1
i8042.noloop=1
i8042.kbdreset=1
i8042.nopnp=1
i8042.debug=1
Comment 1 Rob van den Berg 2017-05-05 09:05:12 UTC 
Created attachment 256221 [details]
dmesg
Comment 2 Rob van den Berg 2017-05-05 09:07:17 UTC 
Created attachment 256223 [details]
devices
Comment 3 nikolas 2017-09-19 13:37:32 UTC 
Can you attach the output of `udevadm info -e` run as root?
Comment 4 Rob van den Berg 2017-09-20 13:45:40 UTC 
NOTE : Currently on 4.9.48-1-MANJARO
output was too long so I pastebinned it

https://pastebin.com/HV6CRvFJ
Comment 5 Vincent Batts 2019-02-25 14:50:08 UTC 
This is still not working on 4.16.3 and 4.20.8 on Fedora
reading on https://alpha-labs.net/2015/08/lenovo-s21e-linux-and-the-touchpad/
it looks like there had been a fix floated for the hid-rmi module.
Comment 6 Vincent Batts 2019-02-25 15:26:19 UTC 
ah, sorry. This looks like an i2c elan touchpad issue. My apologies.
[vbatts@dhcp6-118 ~]$ dmesg | grep -i elan
[    2.442191] i2c_hid i2c-ELAN0601:00: i2c-ELAN0601:00 supply vdd not found, using dummy regulator
Comment 7 Vincent Batts 2019-02-25 19:52:30 UTC 
Created attachment 281341 [details]
add the ELAN0601 ID

this is the patch i've emailed to Duson Lin
Comment 8 Vincent Batts 2019-02-25 19:54:10 UTC 
Confirmed the patch works on the Lenovo s21e-20 laptop with 5.0.0-rc8 kernel. Surely could be backported to other releases.

Duson's EMC email bounced. What subsystem should I mail this patch to
Comment 9 Dmitry Torokhov 2019-02-28 07:16:54 UTC 
Please send to dmitry.torokhov@gmail.com CC linux-input@vger.kernel.org and kt.liao@emc.com.tw

I will need you signed-off-by in the patch description as per Documentation/SubmittingPatches.

Thanks!
Comment 10 Vincent Batts 2019-02-28 13:47:47 UTC 
sent
Comment 11 Vincent Batts 2019-03-20 20:25:41 UTC 
my fix for this has been merged into master and all stable branches back to v4.4
This issue can be closed now.
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