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I have found an issue after upgrading my Kernel from 5.4.0-74-generic to
5.4.0-80-generic on Ubuntu 20.04.
It appears that support for the second ethernet port on my Lenovo m90n-1
has been dropped or isn't working as expected. After upgrading to
5.4.0-80-generic my second ethernet port
Both ethernet ports use the r8169 driver. If I switch back to the
previous kernel 5.4.0-74-generic. The second ethernet port is usable
again.
I did attempt under 5.4.0-80-generic to see if I could get an error
message. When the driver attempts to discover the second ethernet port
the following error is thrown.
"unknown chip XID fcf"
Support output below:
--- Before update.
Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-74-generic x86_64)
root@lenovo-test-3:~# lshw -c network
*-network DISABLED
description: Wireless interface
product: Cannon Point-LP CNVi [Wireless-AC]
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlo1
version: 30
serial: 54:8d:5a:ab:41:77
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet
physical wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=5.4.0-74-generic firmware=46.6bf1df06.0 latency=0 link=no
multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:a141c000-a141ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 15
serial: 98:fa:9b:c9:eb:c6
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet
physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full
firmware=rtl8168h-2_0.0.2 02/26/15 ip=192.168.1.144 latency=0 link=yes
multicast=yes port=MII speed=1Gbit/s
resources: irq:19 ioport:4000(size=256) memory:a1304000-a1304fff
memory:a1300000-a1303fff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:04:00.0
logical name: enp4s0
version: 1b
serial: 98:fa:9b:c9:eb:c7
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet
physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169
firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=MII
resources: irq:19 ioport:3000(size=256) memory:a1204000-a1204fff
memory:a1200000-a1203fff
--- After update
root@lenovo-test-3:~# uname -r
5.4.0-80-generic
root@lenovo-test-3:~# lshw -c network
*-network DISABLED
description: Wireless interface
product: Cannon Point-LP CNVi [Wireless-AC]
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlo1
version: 30
serial: 54:8d:5a:ab:41:77
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet
physical wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=5.4.0-80-generic firmware=46.6bf1df06.0 latency=0 link=no
multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:a141c000-a141ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 15
serial: 98:fa:9b:c9:eb:c6
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet
physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full
firmware=rtl8168h-2_0.0.2 02/26/15 ip=192.168.1.144 latency=0 link=yes
multicast=yes port=MII speed=1Gbit/s
resources: irq:19 ioport:4000(size=256) memory:a1304000-a1304fff
memory:a1300000-a1303fff
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: focal
--
Kernel driver support issue between 5.4.0-74-generic and 5.4.0-80-generic
https://bugs.launchpad.net/bugs/1938697
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