For others affected, installing firmware-iwlwifi from bullseye is a
possible workaround for this issue.
This can be achieved e.g. by pinning:
Add an entry to /etc/apt/sources.list such as
# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1037096
deb http://deb.debian.org/debian bullseye non-free
deb http://security.debian.org/debian-security/ bullseye-security non-free
non-free-firmware
Add a pin for firmware-iwlwifi to /etc/apt/preferences:
Package: *
Pin: release n=bullseye
Pin-Priority: -1
# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1037096
Package: firmware-iwlwifi
Pin: release n=bullseye
Pin-Priority: 1000
Run apt update, apt dist-upgrade and reboot. Make sure to remove this
pin once this issue is resolved to receive updates for this package in
the future.
