The calculator key (Fn + numpad =) emits a press event but never a
release, leaving KEY_CALC permanently held down. Desktop environments
then repeatedly spawn the calculator.
Before:
MSC_SCAN a1 / KEY_CALC value 1
(no release for the remaining 24s of the capture)
After:
MSC_SCAN a1 / KEY_CALC value 1
MSC_SCAN a1 / KEY_CALC value 0 (14us later)
Scancode 0xd7 (Fn+F4) is an atkbd echo of the mic mute key that
ideapad-laptop already reports as KEY_MICMUTE with a proper
press/release pair. Mapping it to unknown silences the repeated
"Unknown key pressed" kernel messages without affecting the working
key.
Tested on Fedora 44, kernel 7.1.10, BIOS P5CN31WW.
