I was having the problem on ubuntu-20.04.2-live-server-amd64. I tried booting on live ubuntu-20.04.2-live-server-amd64 which has kernel 5.11 and the problem is fixed on my side.
I even tried booting on live ubuntu-20.04.2.0-desktop-amd64 which is kernel 5.8 and the issue is also fixed. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1906418 Title: igc driver for Comet Lake onboard 15f3 NIC drops all igmp packets Status in linux package in Ubuntu: Confirmed Bug description: 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. 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. --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27.13 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: culler 2071 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2020-11-17 (13 days ago) InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) MachineType: Gigabyte Technology Co., Ltd. Z490I AORUS ULTRA Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-generic root=UUID=bdba1f28-6903-467f-abfa-10c6bee47cd7 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73 RelatedPackageVersions: linux-restricted-modules-5.4.0-56-generic N/A linux-backports-modules-5.4.0-56-generic N/A linux-firmware 1.187.4 Tags: focal Uname: Linux 5.4.0-56-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 11/03/2020 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F6b dmi.board.asset.tag: Default string dmi.board.name: Z490I AORUS ULTRA dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF6b:bd11/03/2020:svnGigabyteTechnologyCo.,Ltd.:pnZ490IAORUSULTRA:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnZ490IAORUSULTRA:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: Z490 MB dmi.product.name: Z490I AORUS ULTRA dmi.product.sku: Default string dmi.product.version: -CF dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1906418/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
