Following logs show that your Ubuntu definitely thinks your laptop is
equipped with an ELAN touchpad (contrary to Windows opinion):
-
cat /sys/bus/acpi/devices/{ELAN,SYNA,CRQ}*/modalias
acpi:ELAN0632:PNP0C50:
---
Somehow you've got two modules to be loaded simultaneously:
elan_i2c 40960 0
[...]
synaptics_i2c 20480 0
dmesg mentions ELAN0632:
[9.706424] i2c_hid i2c-ELAN0632:00: i2c-ELAN0632:00 supply vdd not found,
using dummy regulator
[9.706437] i2c_hid i2c-ELAN0632:00:
... oh, sorry, I found the link to a full log file...
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https://bugs.launchpad.net/bugs/1853277
Title:
Lenovo ThinkBook 14-IML Touchpad not showing up in
/proc/bus/input/devices
To ma
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https://bugs.launchpa
...and, by the way, which kernel version do you run?
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1853277
Title:
Lenovo ThinkBook 14-IML Touchpad not showing up in
/proc/bus/input/devices
To man
@pavelcheto (pavelcheto),
does you touchpad operate in basic mode (like a mouse, without
two-finger-scrolling and other extended functions) ?
Would you mind sharing the output of at least:
dmesg
cat /proc/bus/input/devices
lsmod
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@ChavTha Chau (chavtha),
thank you for information. I confirm: BIOS update CJCN26WW solves the issue.
Actual vendor change to ACPI table is:
- Name (_HID, "") // _HID: Hardware ID
+ Name (_HID, "ELAN0632") // _HID: Hardware ID
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I informed Lenovo support of the discussed issue on Feb,04 2020.
Since then I discovered an update [1] (CJCN25WW), but it still doesn't solve
the issue.
It's changelog said:
"Summary of changes
==
General Information:
CJCN25WW:
1. Update EC to CJEC27WW
2. Lenovo diagnostic of NO
Although I'm using OS ALT but I performed pretty much similar steps to
patch the ACPI DSDT table.
> In my case the output dsdt.dsl file contained some invalid error
output lines [...]
I also got multiple error messages which I commented for compile to
succeed
/*
*Firmware Error (ACPI): Could no
Managed to get the touchpad operate on 15-IML applying the following:
Initially touchpad didn't operate at all under Linux.
0) UEFI firmware update to CJCN24WW revision
(https://pcsupport.lenovo.com/ru/ru/products/laptops-and-netbooks
/thinkbook-series/thinkbook-15-iml/downloads/driver-
list/comp
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