wifi not detected. Ubuntu 16.04.1 4.8.0.39-generic

[Tobin C. Harding]

On Thu, Feb 23, 2017 at 11:49:39AM -0800, Vasu M wrote:
> Hi,
> 
> Not sure if this is a correct forum to discuss but I am facing an issue on
> Ubuntu 16.04.1 64 bit kernel 4.8.0-39-generic using wifi adapter
> AR2413/AR241 which is running ATH5K version 4.8.0.39-generic. If this is
> not the correct alias, please excuse and suggest the right alias.

4.8.0.39-generic is not currently supported. Perhaps you could try
upgrading to a supported kernel. The Ubuntu 16.04 LTS installs 4.4.0
on my machine. You may like to try compiling a newer custom kernel.

See https://www.kernel.org/ for list of supported kernels.

Good luck,
Tobin.

> 
> After a cold reboot, the NM is not detecting the WIFI. Machine is not able
> to recover from this. I also restarted network manager and reloaded the
> driver but didn't fix the issue.
> 
> Tried:
> sudo rmmod -f ath5k
> (got a msg --  disconnected - you are offline)
> sudo rfkill unblock all
> sudo modprobe ath5k (Nothing happened)
> 
> When i check the /etc/modprobe.d/blacklist-ath_pci.conf, I see the
> following -
> 
> #For some Atheros 5K RF MACs, the madwifi driver loads but fails to
> #correctly initialize the hardware, leaving it in a state from which ath5k
> #cannot recover. To prevent this condition, stop madwifi from loading by
> #default. Use Jockey to select one driver or the other. (Ubuntu #315056,
> #323830)
> blacklist ath_pci
> 
> There are some bugs reported in the past but I don't come across anything
> that was reported in the latest kernel which is similar. Not sure if this
> is a bug still lurking around but I found someone reporting a similar
> problem here -
> https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1569590.
> 
> Any guidance is much appreciated.
> 
> Thanks,
> Vasu

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-- 
Tobin Harding
http://tobin.cc