[Bug 218347] psm driver incorrectly detects trackpad as glidepoint

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218347

            Bug ID: 218347
           Summary: psm driver incorrectly detects trackpad as glidepoint
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kirillrdy at gmail.com

Hi,
so i have Lenovo Thinkpad e450.
Notably this laptops trackpad has dedicated mouse buttons above the track pad.
On linux its being detected as generic mouse ( unlike other thinkpads, as they
get detected as thinkpad trackpads )

on FreeBSD my trackpad gets detected as Glidepoint, which makes left button to
emit button 4 event ( which is i think is noted as one of quarks )
Result is when in browser i click left button it makes browser to back in
history.

I had a quick look inside psm.c in akbdc driver.
simply removing MOUSE_MODEL_GLIDEPOINT from list of devices, which makes it
detect as generic mouse fixes the issue.

So i guess, how do i start debugging this. Is it really Glidepoint trackpad? 

Or is it simply gets detected wrongly ?
I will provide whatever lspci outputs necessary.
Cheers
Kirill R

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