I have an old Dell Inspiron 1440 with a Qualcom Atheros wireless chip.
Intermittently, and without warning, the nic shuts off end disappears as if killed by the hardware switch.
Sometimes, toggling the hardware killswitch brings it back up. Most often it does not. Sometimes a reboot does it, but often two or three boots are required for the interface to come back up. It also shuts off after any hibernation and requres a reboot.
This is more than annoying. Here is the output of lshw:
description: Wireless interface product: AR928X Wireless Network Adapter (PCI-Express) vendor: Qualcomm Atheros physical id: 0 bus info: pci@0000:0c:00.0 logical name: wlp12s0 version: 01 serial: 00:22:5f:f1:0a:4a width: 64 bits clock: 33MHz capabilities: bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=ath9k driverversion=5.4.55-1-MANJARO firmware=N/A ip=192.x.x.x latency=0 link=yes multicast=yes wireless=IEEE 802.11 resources: irq:17 memory:f69f0000-f69fffff