Disabling Touchscreen on a Lenovo ThinkPad T15 Gen2

I'm running Ubuntu 22.10 (Wayland) on a Lenovo ThinkPad T15 Gen2 laptop, and while this particular laptop came configured with a touchscreen, I never use it intentionally: on occasion I've managed to bump the screen which would then register some kind of touch event. So, I wanted to go ahead and disable the touchscreen once and for all.

First, I needed to find the hardware. This was pretty easy using sudo lshw:

...
*-input:11
     product: GTCH7503:00 2A94:D64D Touchscreen
     physical id: d
     logical name: input218
     logical name: /dev/input/event7
     logical name: /dev/input/mouse2
     capabilities: i2c
...

Knowing the name of the touchscreen hardware (GTCH7503:00 2A94:D64D), I could then look in the logs using sudo dmesg | grep -i GTCH to understand how this hardware is getting loaded/registered:

[    2.035353] input: GTCH7503:00 2A94:D64D Touchscreen as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-GTCH7503:00/0018:2A94:D64D.0001/input/input6
[    2.036955] hid-generic 0018:2A94:D64D.0001: input,hidraw0: I2C HID v1.00 Device [GTCH7503:00 2A94:D64D] on i2c-GTCH7503:00
[    8.946824] input: GTCH7503:00 2A94:D64D as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-GTCH7503:00/0018:2A94:D64D.0001/input/input11

A First Solution

I now know that my Lenovo touchscreen is getting managed through both the hid-generic and the hid-multitouch modules. So, I should be able to disable my touchscreen if I remove both of these modules like this:

sudo modprobe -r hid_generic
  AND
sudo modprobe -r hid-multitouch

This works: no touchscreen. Of course, to make this permanent, I'd need to create a file to blacklist these modules in a .conf file in /etc/modprobe.d.

But there's more...

A Second Solution

I also know (from some additional digging into the modules currently in use using lsmod) that I can also do the following:

sudo modprobe -r i2c-hid-acpi
  OR
sudo modprobe -r intel_lpss_pci

And this works too: no touchscreen.

A Third Solution

Finally, and for anyone who's also interested in disabling their Lenovo touchscreen (at least for a T15 Gen2), there's one additional option that doesn't rely on removing kernel modules, but instead disables the touchscreen driver, and that's to edit your grub file in /etc/default to include a specific initcall_blacklist argument:

GRUB_CMDLINE_LINUX_DEFAULT="splash initcall_blacklist=dw_i2c_init_driver"

This final bit of knowledge I learned over on the Unix & Linux StackExchange. I can confirm that blacklisting this "driver" does indeed disable my touchscreen (though again, I'm not sure why and if there can/will be any side effects).

My Question

This is now a bit discouraging because these "solutions" seem to be more of a "shotgun approach" where I'm randomly removing modules with the side-effect (one of many?) that just happens to disable my touchscreen.

For example, my gut tells me that the intel_lpss_pci should probably not be removed (it's the Intel Low Power Subsystem Support module). Same for the hid-generic module (which means that the hid-multitouch module should also stay active). So I think the i2c-hid-acpi module would be the best candidate to remove if I want to disable my touchscreen correctly.

So here's my question:

How do I know--definitively--which module to remove? What's the best approach for determining/troubleshooting specific module functionality with a high degree of certainty?

Thanks