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My internet speed on Ethernet port is hard stuck at ~100 Mbps on wifi I get more than 500 Mbps my internet runs at Gigabit and I have full bandwidth on Pop OS live, windows on the same machine and wire.

The problem is not with the wire and router but with Ubuntu 20.04 and 21.10 for certain.

I am using CAT 7 Cable

I've tried everything and even tried upgrading to 20.10 with no luck what could be the issue here

Here's my lshw -c network output

description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: eno1
       version: 15
       serial: 38:f3:ab:60:5d:a7
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=off broadcast=yes driver=r8168 driverversion=8.048.03-NAPI duplex=full ip=192.168.1.9 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:59 ioport:1000(size=256) memory:d1804000-d1804fff memory:d1800000-d1803fff

Here's ethtools output

Settings for eno1:
    Supported ports: [ TP ]
    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:  Not reported
    Advertised pause frame use: Symmetric
    Advertised auto-negotiation: No
    Advertised FEC modes: Not reported
    Speed: 1000Mb/s
    Duplex: Full
    Auto-negotiation: off
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: internal
    MDI-X: Unknown
    Supports Wake-on: pumbg
    Wake-on: g
        Current message level: 0x00000033 (51)
                               drv probe ifdown ifup
    Link detected: yes

Other Info Ubuntu 21.10 x86_64 , 5.13.0-35-generic, Lenovo Legion 5 15ARH05

Akhil
  • 646
Utkarsh Chandra Srivastava
  • 1,074

1 Answers1

5

Finally found a solution this might be helpful for others.

Known common bug https://bugs.launchpad.net/ubuntu/+source/linux-oem-5.10/+bug/1930754

The solution is to pass a kernel parameter "pcie_aspm=off" to grub.

sudo nano /etc/default/grub

Edit the following line and add pcie_aspm=off


GRUB_CMDLINE_LINUX_DEFAULT="splash pcie_aspm=off"


sudo update-grub

Sources:

Wired network extremely slow

Ubuntu 20.04 slow download speed (wired network)

Utkarsh Chandra Srivastava
  • 1,074