[elrepo] USB wireless adapter not working (4.15)

[Nick Howitt]

Possible link: 
http://www.thelinuxrain.com/articles/getting-realtek-8188eu-wireless-adapters-to-work-in-linux-and-possibly-other-wireless-realtek-chipsets. 
The issue appears to be wpa_supplicant. Google "r8188eu wpa_supplicant"

Nick

On 17/03/2018 09:39, Mahmood Naderan wrote:
> So the output is
>
> Bus 005 Device 006: ID 2001:3310 D-Link Corp.
> $ grep -i 2001 /lib/modules/$(uname -r)/modules.alias | grep -i 3310
> alias usb:v2001p3310d*dc*dsc*dp*ic*isc*ip*in* r8188eu
> $ uname -r
> 4.15.10-1.el7.elrepo.x86_64
> $ lsmod | head
> Module                  Size  Used by
> r8188eu               421888  0
> cfg80211              618496  1 r8188eu
> rfkill                 28672  1 cfg80211
> fuse                  102400  3
> xt_CHECKSUM            16384  1
> ipt_MASQUERADE         16384  3
> nf_nat_masquerade_ipv4    16384  1 ipt_MASQUERADE
> tun                    36864  1
> ip6t_rpfilter          16384  1
>
>
>
> As I run the wpa_supplicant, I get an error where there is a problem
> with initializing the driver.
>
>
> $ ifconfig -a | grep -A 5 wl
> wlp36s0f3u3: flags=4098<BROADCAST,MULTICAST>  mtu 1500
>          ether 10:62:eb:30:9c:34  txqueuelen 1000  (Ethernet)
>          RX packets 0  bytes 0 (0.0 B)
>          RX errors 0  dropped 0  overruns 0  frame 0
>          TX packets 0  bytes 0 (0.0 B)
>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> $ sudo wpa_supplicant -i wlp36s0f3u3 -c
> /etc/wpa_supplicant/wpa_supplicant.conf -B
> Successfully initialized wpa_supplicant
> nl80211: Driver does not support authentication/association or connect commands
> nl80211: deinit ifname=wlp36s0f3u3 disabled_11b_rates=0
> wlp36s0f3u3: Failed to initialize driver interface
>
>
>
> Regards,
> Mahmood
>
>
>
>
> On Fri, Mar 16, 2018 at 10:12 PM, Alan Bartlett <ajb at elrepo.org> wrote:
>> On 15 March 2018 at 16:54, Mahmood Naderan <mahmood.nt at gmail.com> wrote:
>>> Hi,
>>> I upgraded the default 3.10 on centos 7 to 4.15 via the elrepo rpm
>>> packages. I have a D-Link DWA 123 wireless dongle which is working on
>>> ubuntu with kernel 4.10. However, with centos 7 it doesn't work and
>>> the blue LED is off. As I attach the adapter, I see the following
>>> messages in the log
>>>
>> <snip>
>>> Any idea to fix that? Does kernel correctly load the module?
>>>
>>> Regards,
>>> Mahmood
>> My suggestion is that you --
>>
>> * First upgrade to kernel-ml-4.15.10-1.el7.elrepo, which was released
>> yesterday. [1]
>>
>> * Once the system has been rebooted and with the wireless dongle
>> unplugged, capture the state of the USB sub-systems; lsusb > usb-1.txt
>>
>> * Now plug in the USB wireless dongle and, once again capture the
>> state of the USB sub-systems; lsusb > usb-2.txt
>>
>> * Perform a diff on those two textual files and note the Vendor and
>> Device ID pairing for the wireless dongle.
>>
>> * Perform a "double grep" on the modules.alias file for the Vendor and
>> Device ID pairing. Note the module name displayed, if any.
>>
>> Real-world example --
>>
>> [Duo2 tmp]$ lsusb > usb-1.txt
>> [Duo2 tmp]$ lsusb > usb-2.txt
>> [Duo2 tmp]$ diff usb-1.txt usb-2.txt
>> 0a1
>>> Bus 002 Device 002: ID 0b95:7720 ASIX Electronics Corp. AX88772
>> [Duo2 tmp]$ grep -i 0b95 /lib/modules/$(uname -r)/modules.alias | grep -i 7720
>> alias usb:v0B95p7720d*dc*dsc*dp*ic*isc*ip*in* asix
>> [Duo2 tmp]$
>>
>> The Vendor and Device ID pairing for the device used in my example is
>> 0b95:7720 and, via the double grep, we see that the asix module is
>> required.
>>
>> With the required module known, it should be easy to see if it has
>> been loaded; lsmod | head
>>
>> Alan.
>>
>> [1] http://lists.elrepo.org/pipermail/elrepo/2018-March/004164.html
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