Public bug reported:
When testing 20.04.1, I noticed some different behavior on rpi3b+ that I
didn't see on rpi3b or rpi4. I have configured the device with
ethernet, added netplan yaml for my wifi network, and rebooted. So both
eth0 and wlan0 have an ip address.
On all other devices (rpi3b, rpi4, etc), if I unplug eth0 wile pinging
something, I'll miss maybe 1 ping and then it will continue to work and
just switch over to wlan0. However, on rpi3b+ it just stops being able
to access the network completely. If I re-run netplan apply, it will
start using wifi again, but if I plug eth0 back in, then unplug it, it
stops just like before.
I am seeing this with the current 20.04.1 release:
Linux ubuntu 5.4.0-1015-raspi #15-Ubuntu SMP Fri Jul 10 05:34:24 UTC 2020
aarch64 aarch64 aarch64 GNU/Linux
I also went back and tested the original 20.04 release and it happens there
too, so this is not a regression:
Linux ubuntu 5.4.0-1008-raspi #8-Ubuntu SMP Wed Apr 8 11:13:06 UTC 2020 aarch64
aarch64 aarch64 GNU/Linux
I see this happen on both armhf and arm64. One difference I did note, is that I
get a link down message in dmesg on rpi3b, but not rpi3b+. When I disconnect
eth0 on rpi3b I see this:
[ 82.203702] smsc95xx 1-1.1:1.0 eth0: link down
...but nothing on the 3b+.
** Affects: linux-raspi2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1890487
Title:
rpi3b+ wifi doesn't get used if ethernet disconnected
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