Thanks for the information.

>From the rdesc, the raw report data (01 00 00) does not match may valid
HID_USAGE_PAGE/HID_USAGE. That's why they are not processed.

>From the raw data by the command cat /dev/usb/hiddev0 | hexdump -v -e
'/1 "%02X\n"', it seems that the data is MicroSoft specific usage page
and the usage is 0xDC for mute key and 0xDB for Fn+F10.

Can you give me the raw data in parallel (cat /dev/usb/hidddev0 and the
/sys/kernel/debug/hid/0003:17ef:60a9.0003/events)? I want to identify
the code for HID_USAGE_PAGE/HID_USAGE when Fn+F4 and Fn+F10. When that's
confirmed, I'll send you a customized kernel for verification and trying
to fix it in our release.

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https://bugs.launchpad.net/bugs/1927545

Title:
  Some of Lenovo Lenovo Essential Wireless Keyboard Fn keys doesn't work

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