My system now behaves as described above. A only difference is that I have wired and wireless network. When I enable both interfaces, cups takes 100 % CPU.
I think I can take some debug info if needed. Thanks, -- System Information: Debian Release: buster/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386, armhf Kernel: Linux 4.19.0-4-amd64 (SMP w/4 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.\ UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages cups-browsed depends on: ii cups-daemon 2.2.10-4 ii libavahi-client3 0.7-4+b1 ii libavahi-common3 0.7-4+b1 ii libavahi-glib1 0.7-4+b1 ii libc6 2.28-8 ii libcups2 2.2.10-4 ii libcupsfilters1 1.21.6-4 ii libglib2.0-0 2.58.3-1 ii libldap-2.4-2 2.4.47+dfsg-3 ii lsb-base 10.2019031300 Versions of packages cups-browsed recommends: ii avahi-daemon 0.7-4+b1 cups-browsed suggests no packages. -- no debconf information -- yashi