I installed Manjaro KDE on a laptop of my friend. He has a HP Pavilion 17" and this WiFi card:
I installed the Manjaro Broadcom BCM43142 drivers and the Wifi card works basically. But when the laptop goes into standby and wake up again the WiFi card get sometimes connections, but sometimes it tries to connect and cannot. Finally it gets disconnected/deactivated. I do not understand why this sometimes works and sometimes not.
By the way the AUR drivers for BCM43142 do not work at all.