https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282592
Bug ID: 282592
Summary: Framework Laptop 16: Touchpad driver crashes on boot
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
On the Framework Laptop 16, the touchpad driver (sys/dev/hid/hmt.c) crashes on
boot.
This only occurs when the touchpad is present.
If the touchpad is disconnected on boot, the EC will pretend to be the touchpad
and send the exact same HID report descriptor to the OS as the touchpad does.
The difference is that it won't send any HID reports and does not respond to
any GET_REPORT requests, except for report ID 2 where it returns the bytes
`{0x04, 0x00, 0x02, 0x05, 0x00, 0x00, 0x00, 0x00}`.
See:
https://github.com/FrameworkComputer/EmbeddedController/commit/9d49389919c36e44e451514b8278b9eb7ee6ed1e
Analysing the crashdump it seems we crashed in this line:
https://github.com/freebsd/freebsd-src/blob/609fa228bae6d864558f5167d4a964aab2a5fc88/sys/dev/hid/hmt.c#L757
But looking at the HID report descriptor `left_button` will be 2 and there is
no matching Usage that could land us in this if branch.
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