Public bug reported:
On RPI4, if you set up netplan to use wifi, and plug in a usb3 storage
device to one of the 2x usb3 ports (the ones closest to the ethernet
port), wifi will sudden stop working. If you unplug the usb stick while
running a ping, it will usually start working again almost
instantaneously.
Kernel version I have is: 5.3.0-1017-raspi2
and I've confirmed this happens on both armhf and arm64
The only thing I found in journalctl that looks suspicious is that I get a lot
of this after plugging in the usb stick:
Jan 29 20:54:59 ubuntu wpa_supplicant[1129]: random: Cannot read from
/dev/random: Resource temporarily unavailable
** Affects: linux-raspi2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1861338
Title:
RPI4 wifi unreliable when usb3 storage is attached
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