I have Keycool KC84 connected via bluetooth. In kernels prior to 5.14, it works as expected. However, since 5.14 pressing the function keys trigger multimedia functions instead. The temporary fix is to reload hid_apple module with fnmode=2 option: $ sudo modprobe -rv hid_apple && sudo modprobe -v hid_apple fnmode=2 I will test and report later whether in 5.10 hid_apple module is even loaded or not.