Hi Jonathan,

For starters, did you see this in dmesg? :

[    0.422648] i8042: PNP: PS/2 Controller [PNP0303:KBC0] at 0x60,0x64 irq 1
[    0.422652] i8042: PNP: PS/2 appears to have AUX port disabled, if this is incorrect please boot with i8042.nopnp

And did you try booting with "i8042.nopnp" ?

Also what is the output of:

ls -l /sys/bus/i2c/devices

and of:

ls -l /sys/bus/acpi/devices/ELAN066C:00/

and of:

cat /sys/bus/acpi/devices/ELAN066C:00/status

?

Regards,

Hans





On 10/14/23 19:12, jdieter@gmail.com wrote:

Hi Dmitry, Hans, input mailing list,

I have two Lenovo 300e laptops, one running Windows and the other
Fedora.  The laptop has a touchscreen, a stylus and a touchpad.  The
touch screen and stylus work perfectly, but, under Fedora, the touchpad
doesn't work at all and isn't detected by the kernel.

The device shows up in /sys/bus/acpi/devices/ELAN066C:00/ with a
modalias of acpi:ELAN066C:PNP0C50:.

I'm not sure if the touchpad should be using elan_i2c or i2c_hid_acpi.
In a somewhat naive attempt to get something to happen, I added:

    { "ELAN066C", 0 }, /* Lenovo 100e/300e 2nd gen AMD */

to include/linux/input/elan-i2c-ids.h, but the kernel still doesn't
auto-load the module.

I can get elan_i2c to recognize something if I run:
# echo elan_i2c 0x15 > /sys/bus/i2c/devices/i2c-1/new_device 
but the IRQ defaults to 0, and I get an error about an IRQ conflict:

[ 2317.791897] i2c i2c-1: delete_device: Deleting device elan_i2c at
0x15
[ 2319.317468] i2c i2c-1: new_device: Instantiated device elan_i2c at
0x15
[ 2319.317662] elan_i2c 1-0015: supply vcc not found, using dummy
regulator
[ 2319.433176] elan_i2c 1-0015: Elan Touchpad: Module ID: 0x00be,
Firmware: 0x0003, Sample: 0x0003, IAP: 0x000e
[ 2319.433184] elan_i2c 1-0015: Elan Touchpad Extra Information:
                   Max ABS X,Y:   3206,1828
                   Width X,Y:   152,152
                   Resolution X,Y:   31,31 (dots/mm)
                   ic type: 0xa
                   info pattern: 0x0
[ 2319.433339] genirq: Flags mismatch irq 0. 00002008 (elan_i2c) vs.
00015a00 (timer)

By manually setting the IRQ to an unused value in the driver, I can at
least get the driver to create a new mouse device in /dev/input, but
the touchpad still doesn't work.

At this point, I don't know if I'm really close or barking up the
completely wrong tree.

A bug report from earlier this year about an identical system is at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1976556

Attached is the dsl of the device in ACPI.

I would really appreciate any help in figuring out how to get this
working.  Please let me know if there's anything else you need from me.

Thanks,

Jonathan