Wifi issues

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hanax
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Wifi issues

Post by hanax »

Greetings,

I have N2 with old Wifi module bought in year 2014 for C1.

lsusb:

Code: Select all

Bus 001 Device 003: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
It works, but I get connection drops. Sometimes it holds for only for several minutes, sometimes for about an hour.

dmesg:

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kern  :info  : [So júl  4 17:34:16 2020] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
kern  :info  : [So júl  4 17:42:01 2020] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
kern  :info  : [So júl  4 17:42:08 2020] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
kern  :info  : [So júl  4 17:49:11 2020] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
kern  :info  : [So júl  4 17:49:51 2020] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
kern  :info  : [So júl  4 18:02:37 2020] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
kern  :info  : [So júl  4 18:02:45 2020] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
I tried another wifi module, but the problem persists. So it seem the problem is not the dongle, but rather a driver or N2 itself.

The main problem is that this connection drops affects other PCs in network - also cabled ones. So it seems that somehow wifi from N2 makes my router go crazy about some communication errors and it resets interfaces as some kind of protection... or whatever, I do not know much about this stuff.

Additional info:
- kernel 4.9.219-72
- lsmod tells me that 8192cu is in use.

Many thanks for any help.
Last edited by hanax on Mon Jul 06, 2020 4:09 pm, edited 1 time in total.

mad_ady
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Re: Wifi issues

Post by mad_ady »

Somewhere in /etc/NetworkManager there is a file that sets wifi powersave on. You may want to turn it off.
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hanax (Wed Jul 08, 2020 3:09 am)

hanax
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Re: Wifi issues

Post by hanax »

in /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf i have changed 3 to 2

Code: Select all

[connection]
# Values are 0 (use default), 1 (ignore/don't touch), 2 (disable) or 3 (enable).
wifi.powersave = 2
and apparently it worked.

Many thanks!

hanax
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Re: Wifi issues

Post by hanax »

In fact, it only reduced frequency of drops, but the problem still persists - several times a day. Any other idea, please?

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Re: Wifi issues

Post by mad_ady »

I doubt there's much you can try...
But, in order of difficulty:
1. Try to get a USB extension cable and move the wifi to a better reception position
2. Try to use the USB otg port for wifi
3. See if you can find and build a newer driver (dkms).
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hanax (Wed Jul 08, 2020 3:09 am)

hanax
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Re: Wifi issues

Post by hanax »

1. already tried, no effect.
2. tried and 12 hours without single drop! I hope that finally it is solved. BUT WHY? - changing not OTG port to OTG should make some difference? I am so curious - could you please explain in few words?
Anyway many many thanks.

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Re: Wifi issues

Post by odroid »

I've seen some people mentioned the USB 3.0 signals could interfere the 2.4Ghz RF bands.
Note that the OTG port is USB 2.0.
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hanax (Wed Jul 08, 2020 2:49 pm)

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Re: Wifi issues [RESOLVED]

Post by hanax »

Thanks, good to know, also to be cautions in the future... apparently it is more true than false.

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