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I'm currently using Pop!_OS and unfortunately I've encountered an issue with my Ethernet-Connection:

My Internet-Speed on Pop!_OS is capped at 100 Mbit/s. My Internet-Speed from my ISP is 200 Mbps in Downstream and 8 Mbps Upstream so that is not the problem. Also before Pop!_OS I used Windows and I had 200 Mbps Downstream and 8 Mbps Upstream there. It is a wired connection too so it should be pretty stable most of the time.

The Ethernet-Controller in my motherboard (MSI B550-A Pro) is the Realtek® 8111H Gigabit LAN controller.

I already did some research but couldn't really find a solution.

I hope you can help me!

Edit: The ethtool says the following:

ethtool enp42s0
Settings for enp42s0:
    Supported ports: [ TP    MII ]
    Supported link modes:   10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
                            1000baseT/Full
    Supported pause frame use: Symmetric Receive-only
    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
    Link partner advertised pause frame use: Symmetric Receive-only
    Link partner advertised auto-negotiation: Yes
    Link partner advertised FEC modes: Not reported
    Speed: 100Mb/s
    Duplex: Full
    Auto-negotiation: on
    master-slave cfg: preferred slave
    master-slave status: slave
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: external
    MDI-X: Unknown
netlink error: Operation not permitted
    Link detected: yes

Edit: I fixed it by disabling IPv6 in the Network-Settings and rebooting. Now it shows 1000 Mbit/s instead of 100 Mbit/s and also full speed is there now.

Edit 2: Here is the terminal after I disabled IPv6:

ethtool enp42s0
Settings for enp42s0:
    Supported ports: [ TP    MII ]
    Supported link modes:   10baseT/Half 10baseT/Full
                        100baseT/Half 100baseT/Full
                        1000baseT/Full
    Supported pause frame use: Symmetric Receive-only
    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/Half 1000baseT/Full
    Link partner advertised pause frame use: Symmetric Receive-only
    Link partner advertised auto-negotiation: Yes
    Link partner advertised FEC modes: Not reported
    Speed: 1000Mb/s
    Duplex: Full
    Auto-negotiation: on
    master-slave cfg: preferred slave
    master-slave status: master
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: external
    MDI-X: Unknown
netlink error: Operation not permitted
    Link detected: yes
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    It looks like you found a solution to your issue. Would you be able to post it as an answer rather than as an edit to the question? See also https://unix.stackexchange.com/help/self-answer However, if you can't describe why what you did resolved the issue, then we might instead opt for closing your question as "off-topic; problem went away". – Kusalananda Jul 25 '21 at 18:52
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    If you re-enable IPv6 and reboot, are you again capped at 100 Mbit/s? – Kusalananda Jul 25 '21 at 19:00
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    yeah IPv6/IPv4 is one layer "above" your link speed, I bet that it works now is just a lucky coincidence, not an actual solution. – Marcus Müller Jul 25 '21 at 19:07
  • What is the category of the cable or its state of conservation? Seems like a flaky cable. – Rui F Ribeiro Jul 26 '21 at 15:20
  • The state of the cable is pretty good. On Windows I never had any problems with it. –  Jul 26 '21 at 16:23

2 Answers2

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Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                     100baseT/Half 100baseT/Full

This is what the remote end has reported it will support. Since there is no 1000baseT/Full option, here the device at the far end of the network cable is telling it won't support a gigabit connection.

When you disabled IPv6, did you also change the network cable in any way? Did you, for example, plug it into a different port in the modem? Perhaps only some of its ports are gigabit capable.

telcoM
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    I only disabled IPv6. I didn't change the network cable in any way. Yesterday I then enabled IPv6 again and it stayed at 1000 Mbit/s but today it downgraded again to 100 Mbit/s so I disabled it today again and it's now at 1000 Mbit/s again. –  Jul 26 '21 at 12:51
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I've tried disabling ipv6 and that didn't work for me. My issue was caused by "powersave" tuning profile which was putting NIC in 100MBps mode.

To check your tuning profile run sudo tuned-adm active. If this returns "powersave" then change it to the default sudo tuned-adm profile balanced

Svetozar Misljencevic
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