Microsoft Natural Ergonomic Keyboard 4000 issues

[axeld]

When pressing the F-lock key, its LED goes off, and the F-keys don't work anymore - as expected. Unfortunately, it doesn't go back anymore, the LED is not light again when you press the F-lock key again.

Also, none of the extra (media, ...) keys seem to work.

Here is a description of its HID report:

0501 USAGE_PAGE generic desktop 0906 USAGE keyboard a101 COLLECTION application 0508 USAGE_PAGE led 1901 USAGE_MIN num lock 2903 USAGE_MAX scroll lock 1500 LOGICAL_MIN 0 2501 LOGICAL_MAX 1 7501 REPORT_SIZE 1 9503 REPORT_COUNT 3 9102 OUTPUT variable 094b USAGE 0x4b ??? 9501 REPORT_COUNT 1 9102 OUTPUT variable 9504 REPORT_COUNT 4 9101 OUTPUT constant 0507 USAGE_PAGE keyboard 19e0 USAGE_MIN keyboard left control 29e7 USAGE_MAX keyboard right gui 9508 REPORT_COUNT 8 8102 INPUT variable 7508 REPORT_SIZE 8 9501 REPORT_COUNT 1 8101 INPUT constant 1900 USAGE_MIN 0 (reserved) 2991 USAGE_MAX 145 (keyboard lang2) 26ff00 LOGICAL_MAX 0xff / 255 9506 REPORT_COUNT 6 8100 INPUT c0 COLLECTION_END