Unclaimed AR5416 Wireless Network Adapter

[Michael Heuberger]

On my latest Ubuntu 17.10 I am unable to use my WiFi, only Ethernet. Didn't happen before I upgraded from 16.10.

The `sudo lshw -C network` command tells me the AR5416 Wireless Network Adapter is UNCLAIMED:

```
└─❱❱❱ sudo lshw -C network
  *-network
       description: Ethernet interface
       product: 88E8056 PCI-E Gigabit Ethernet Controller
       vendor: Marvell Technology Group Ltd.
       physical id: 0
       bus info: pci@0000:05:00.0
       logical name: eth0
       version: 12
       serial: f4:6d:04:00:dc:74
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list rom
ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd
autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=sky2
driverversion=1.30 duplex=full ip=192.168.2.10 latency=0 link=yes
multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:35 memory:fbdfc000-fbdfffff ioport:d800(size=256)
memory:fbdc0000-fbddffff
  *-network UNCLAIMED
       description: Network controller
       product: AR5416 Wireless Network Adapter [AR5008 802.11(a)bgn]
       vendor: Qualcomm Atheros
       physical id: 1
       bus info: pci@0000:07:01.0
       version: 01
       width: 32 bits
       clock: 66MHz
       capabilities: cap_list
       configuration: latency=168
```

Here few more useful info from other commands

```

└─❱❱❱ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.

└─❱❱❱ lspci -vnn | grep Network
07:01.0 Network controller [0280]: Qualcomm Atheros AR5416 Wireless
Network Adapter [AR5008 802.11(a)bgn] [168c:0023] (rev 01)
    Subsystem: Qualcomm Atheros AR5416 Wireless Network Adapter [AR5008
802.11(a)bgn] [168c:3071]
```

and yes, dmesg tells me initialisation of that device failed during startup:

```
└─❱❱❱ dmesg | grep ath
...
[ 25.700597] ath: phy0: address test failed addr: 0x00008000 -
wr:0x00000000 != rd:0x01000000
[ 25.758375] ath: phy0: Unable to initialize hardware; initialization
status: -19
[ 25.814677] ath9k 0000:07:01.0: Failed to initialize device
[ 1111.517258] ath9k: ath9k: Driver unloaded
```

Any clues what this could be? Any hints very much appreciated! Thanks guys