I'm using Kubuntu 20.04 LTS on a DELL XPS 13 9360 connecting to the network via a DELL WD15 docking station. After several minutes of inactivity the Ethernet interface goes stalled and no any internet connection or LAN works. Trying to disconnect and reconnect doesn't work 'cause, once stalled, it is not able to take the DHCP address. Sometimes it even behaves like if the network cable is disconnected. The only thing I can do it to reboot. I change the network cable (CAT 5), the RJ45 plug, but nothing else works.
Here is the topology:
Router -> CAT 5 cable -> Switch -> CAT 5 Cable -> RJ45 plug -> DELL WD 15 docking station -> USB-C -> Computer.
Having tried the following topology:
Router -> CAT 5 cable -> RJ45 plug -> DELL WD 15 docking station -> USB-C -> Computer doesn't change anything.
Here are some information:
00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics 640 (rev 06)
DeviceName: Onboard IGD
Subsystem: Dell Iris Plus Graphics 640
*-network:2
description: Ethernet interface
physical id: 4
bus info: usb@4:1.2
logical name: enxa44cc8b16f57
serial: a4:4c:c8:b1:6f:57
size: 1Gbit/s
capacity: 1Gbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.10.11 duplex=full ip=192.168.1.15 link=yes multicast=yes port=MII speed=1Gbit/s
Settings for enxa44cc8b16f57:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00007fff (32767)
drv probe link timer ifdown ifup rx_err tx_err tx_queued intr tx_done rx_status pktdata hw wol
Link detected: yes
Even stranger, I have a DELL XPS 15 9570 box as well, running the same Kubuntu release (20.04.1 LTS) on the same network, using the same DELL WD 15 docking station, with exactly the same topology, which doesn't show the issue.
Here are the same information for the DELL XPS 15:
*-network:0
description: Ethernet interface
physical id: 2
bus info: usb@4:1.2
logical name: enxe4b97acb30ee
serial: e4:b9:7a:cb:30:ee
size: 100Mbit/s
capacity: 1Gbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.10.11 duplex=full ip=192.168.1.47 link=yes multicast=yes port=MII speed=100Mbit/s
Settings for enxe4b97acb30ee:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00007fff (32767)
drv probe link timer ifdown ifup rx_err tx_err tx_queued intr tx_done rx_status pktdata hw wol
Link detected: yes
The only difference I can see is that my DELL XPS 15 connects at 100Mbit/s, while the XPS13 connects at 1Gbit/s. I'm not sure where from this difference comes from but I have configured the Network Manager on the XPS 13 such that to have the Link Negotiation "manual" instead of "automatic" or "ignore" and to force it at 100Mbit/s but, besides the fact the interface is much slower, nothing has changed, the issue is still present.
The issue didn't happen previously before migrating from 18.04 LTS to 20.04 LTS. I would think that it's a 20.04 LTS issue but I have two boxes running the same release and only one has the issue. The two boxes are running the same kernel version which is Ubuntu 20.04.1 LTS.
Could someone help me here please ?
Many thanks in advance.
Kind regards,
Seymour
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