After I did
pacman -Syu yesterday, the internal WLAN doesn't work any more.
So I plugged in an external USB network device (Realtek) and it worked fine with the same settings. But the internal device starts with failure: "Failed to create interface p2p-dev-p2p-dev-wlan0: -22 (Invalid argument)"
iwlist wlan0 scan returns: "wlan0 Interface doesn't support scanning: Invalid argument"
Seems there is a firmware file missing (I read, if the Broadcom adapter isn't able to scan for networks, the firmware hasn't loaded). Has anybody got an idea what's missing and where to get it?
My kernel is 4.9.62-1-ARCH #1 SMP Fri Nov 17 13:51:32 UTC 2017 armv7l GNU/Linux.
The firmware is linux-firmware-20171009.bf04291-1-any and raspberrypi-firmware-20171103-1-any.