On 29/11/2024 23:13, bp@www.zefox.net wrote:

The Natural Philosopher <tnp@invalid.invalid> wrote:

On 27/11/2024 20:22, bp@www.zefox.net wrote:

It turns out that letting the system stand for ~4 hrs reproduced some
of the problems. Ping times with both interfaces up eventually rose to
7-10 ms but didn't fail completely. Several of the ssh connections
open from the Pi5 to other hosts either froze or disconnected.

That's exactly what I got with an inadequate PSU.

Since a software update this morning it appears that both interfaces
are co-existing without problems. Re-checking the supply voltage
reveals 5.05 volts, 10 mV below the value seen earlier, measured on
the GPIO header.

I got sag when USB was drawing current I think.

That's not to claim the problem is resolved: It took about four hours
to misbehave in the previous instance, now it might merely take longer.

Fingers crossed.

uname -a now reports
Linux raspberrypi 6.6.62+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.6.62-1+rpt1 (2024-11-25) aarch64 GNU/Linux

Thanks for writing,

bob prohaska

Reminds me of that old BT advert where an old lady discovers her phone
isn't working. Cut to engineers in vans climbing poles, remaking
connections and so on, cut to old lady lifting the handset 'Oh, its
fixed itself!'...



--
“It is dangerous to be right in matters on which the established
authorities are wrong.”

― Voltaire, The Age of Louis XIV

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The Natural Philosopher <tnp@invalid.invalid> wrote:

On 29/11/2024 23:13, bp@www.zefox.net wrote:

The Natural Philosopher <tnp@invalid.invalid> wrote:

On 27/11/2024 20:22, bp@www.zefox.net wrote:

It turns out that letting the system stand for ~4 hrs reproduced some
of the problems. Ping times with both interfaces up eventually rose to >>>> 7-10 ms but didn't fail completely. Several of the ssh connections
open from the Pi5 to other hosts either froze or disconnected.

That's exactly what I got with an inadequate PSU.

Since a software update this morning it appears that both interfaces
are co-existing without problems. Re-checking the supply voltage
reveals 5.05 volts, 10 mV below the value seen earlier, measured on
the GPIO header.

I got sag when USB was drawing current I think.

That's not to claim the problem is resolved: It took about four hours
to misbehave in the previous instance, now it might merely take longer.

Fingers crossed.

uname -a now reports
Linux raspberrypi 6.6.62+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.6.62-1+rpt1 (2024-11-25) aarch64 GNU/Linux

Through this morning the networking functioned normally. Then I noticed a
batch of new system updates. After installing and rebooting the trouble returned, slightly worse. Now the internal wifi simply fails to connect.
The external usb-wifi adapter works as expected. I'm again seeing failures reported for networkmanager-wait-online, but don't understand what they mean.

Looking through journalctl output, filtered for wlan0, I see a torrent of output, some of which states:

Nov 30 09:19:00 raspberrypi NetworkManager[852]: <warn> [1732987140.7820] device (wlan0): Activation: (wifi) association took too long
Nov 30 09:19:00 raspberrypi NetworkManager[852]: <info> [1732987140.7821] device (wlan0): state change: config -> failed (reason 'no-secrets', sys-iface-state: 'managed')
Nov 30 09:19:00 raspberrypi NetworkManager[852]: <warn> [1732987140.7826] device (wlan0): Activation: failed for connection 'Wi-Fi connection 1'
Nov 30 09:19:00 raspberrypi NetworkManager[852]: <info> [1732987140.7828] device (wlan0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')

The mismash of reasons looks inconsistent to me.

The only changes have been disconnecting and reconnecting the usb-wifi
dongle, right now it's connected and the gpio is showing 5.08 volts. I
suspect the small fluctuations seen reflect line voltage drift more
than load.

In any case, I've now navigated successfully from the frying pan back
to the fire 8-)

Thanks for reading,

bob prohaska

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On Fri, 29 Nov 2024 13:27:40 +0000, The Natural Philosopher wrote:

The point being wifi is as shit as coaxial ethernet was, and should be avoided if at all possible

I find it hard to disagree. ;)

I have Ethernet connections running into both my bedroom and living room.
The wi-fi is fine for basic web browsing (not including watching videos),
but anything more traffic-intensive, and I plug the nearest handy cable
into my laptop.

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