The line from dpkg.log reporting installation of this kernel package is: 2020-12-01 06:19:50 status installed linux-image-5.4.0-56-generic:amd64 5.4.0-56.62
** Package changed: ubuntu => linux (Ubuntu) ** Description changed: This is occurring on Ubuntu 20.04 with kernel 5.4.0-56-generic. To demonstrate, run $ sudo tcpdump -nv -ienp4s0 igmp (adjusting the interface name appropriately). - The result will be 0 packets captured, even though all other Ubuntu systems on the same ethernet - lan are reporting igmp queries from the router and responding with reports every minute or so. + The result will be 0 packets captured, even though all other Ubuntu + systems on the same ethernet lan are reporting igmp queries from the + router and responding with reports every minute or so. - One consequence of this is that a CUPS server using the Comet Lake onboard ethernet controller - cannot be detected by any clients, except within the first 120 seconds after restarting the - avahi-daemon. Since the Comet Lake server does not receive the igmp queries, it does not respond - with a report and so the router unsubscribes the interface from the multicast group that is used - by avahi and bonjour. This makes the CUPS server disappear. + One consequence of this is that a CUPS server using the Comet Lake + onboard ethernet controller cannot be detected by any clients, except + within the first 120 seconds after restarting the avahi-daemon. Since + the Comet Lake server does not receive the igmp queries, it does not + respond with a report and so the router unsubscribes the interface + from the multicast group that is used by avahi and bonjour. This + makes the CUPS server disappear. The output of ubuntu-bug linux is attached. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1906418 Title: igc driver for Comet Lake onboard 15f3 NIC drops all igmp packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1906418/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
