Problem with wifi after update

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Jesper Kaas 4 years ago

Hi

I am running Ubuntu 22.04 LTS 64 bit on a Raspberry Pi 4. The installation has worked perfect with WiFi for 2-3 months since I installed it. While working on the Pi yesterday morning, I got a pop-up about a pending update. I started the update, let in run in the backgrund continuing my work. When finished turned the system off. A few hours later the wifi would not connect to my local router (same as it is always connecting to. Tried the usual fidling with no help, so I settled for a restart. No help in the restart, but after a little while wifi connected OK, and I could work on the machine. Today I have had problems 2 times with the wifi. Have of course checked all settings for this connection in Ubuntu, and all are correct. Also tried changing a setting to the wrong one and then change back to the correct, but still dead wifi. And the suddenly it connects. And while it tries to connect with no luck, it says "Strong signal", so the signal is fine. he Pi is sitting just 2 meters from the router. No change done on the router, and all other devices (phones, laptop,

++) is working as usual.

So have others experienced similar trouble after the updates. Any suggestions to what I can do.

PS: I am a long time beginner in Linux, so please be patient :-)

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T

The Natural Philosopher 4 years ago

No actual trouble with updates per se, but wifi on the Pi has not been a hugely reliable experience for me at least on the Pi Zero-W.

Under rather weaker signal conditions it would sometimes not connect drop or go very slowly.

But I had no problems when iwconfig showed the signal was strong, so my first step would be to use iwconfig [wlan0] to probe the interface to see what was happening and if there are any dropped packets etc

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D

druck 4 years ago

Try doing a:

iw wlan0 set power_save off

This improved reliability and significantly lowered latency for me under those conditions.

Note that is command transient, and needs to be put in a udev rule to make persistent over reboots.

---druck

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J

Jesper Kaas 4 years ago

Thank you for presenting iwconfig. I will check its possibilities in som manual. But for a quick go i ran iwconfig while the wifi was "connecting" (but didnot succeed) and got this output (moved to PC via later connected cabled ethernet): jyttejesper@jkrp4:~$ iwconfig lo no wireless extensions.

eth0 no wireless extensions.

wlan0 IEEE 802.11 ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=31 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on jyttejesper@jkrp4:~$ ^C jyttejesper@jkrp4:~$

After the cabled net was on, also the wifi connected. A new iwconfig run on the pi showed this:

jyttejesper@jkrp4:~$ iwconfig lo no wireless extensions.

eth0 no wireless extensions.

wlan0 IEEE 802.11 ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=31 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on jyttejesper@jkrp4:~$ ^C jyttejesper@jkrp4:~$

Unplugged the cable, and the wifi still worked.

I tried "iwconfig help", "iwconfig /?", "iwconfig man", and at last succeeded with "man iwconfig". But the output is overwhelming. Do you have some more advice?

Best regards

-jesper

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J

Jesper Kaas 4 years ago

Now I get this when running "iwconfig wlan0": jyttejesper@jkrp4:~$ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"12Com" Mode:Managed Frequency:2.412 GHz Access Point: FC:E3:3C:BE:6E:E4 Bit Rate=24 Mb/s Tx-Power=31 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on Link Quality=56/70 Signal level=-54 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:2 Invalid misc:0 Missed beacon:0

jyttejesper@jkrp4:~$

So it looks like wifi started working after the cable was unplugged.

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Problem with wifi after update

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