On 06.03.2017 21:44, Stephen Morris wrote:
It has subsequently turned out that wlp4s6 was an old pci wifi card
I still had in my machine that I thought was dead. I was not aware of
the naming conventions for the device identifiers, so I was not aware
that wlp4s6 was not my USB wifi adapter. So I have been trying all this
time to get the 5GHz channel working on wlp4s6 because of this
misunderstanding when in reality that device doesn't have a 5 GHz channel.
The whole reason for my USB wifi adapter not being used was because I
needed to download and compile a driver to be able to use the device as
there is no inbuilt support for it.
I would like to thank everybody who provided support for this issue and
apologize for wasting everyone's time (I had a DWA182 which had to have
a driver compiled to be usable so I should have expected the DWA192 to
be in the same situation).
As a side issue to this, actually getting the USB device working has
highlighted a bug in Fedora that doesn't exist in Ubuntu (Ubuntu has a
different bug that Fedora doesn't have).
Also Fedora and Ubuntu both use the same naming convention for the pci
wifi adapter but they use a different naming convention for the same USB
wifi adapter plugged into the same USB port. Why is this the case, why
isn't there a Linux wide naming standard?
$ man 8 udevadm
udevadm info [options] [devpath|file]
Queries the udev database for device information stored in the udev database. It
can also query the properties of a device from its
sysfs representation to help creating udev rules that match this device.
Thus, one can do the following,
e.g. for D-Link DWA-192 - if the ifname is "wlp3s0u2":
# udevadm info -a -p /sys/class/net/wlp3s0u2
In accordance with the properties listed, udev rule can be made,
a rule to rename the ifname:
Re-plug USB device, observe dmesg output.