Ask Ubuntu Asked by 3guesses on February 8, 2021
I have just installed Ubuntu 17.10 on my Toshiba Satellite L50t-a-140 laptop which has a gigabit ethernet wired adapter connected to a gigabit ethernet switch, but Ubuntu reports the link speed at 100Mbps. How can I work out why it is not reporting a gigabit ethernet connection?
~$ sudo lshw -C network
*-network
description: Ethernet interface
product: AR8161 Gigabit Ethernet
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:01:00.0
logical name: enp1s0
version: 10
serial: 00:8c:fa:94:4f:09
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=alx duplex=full ip=192.168.1.4 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:16 memory:b0500000-b053ffff ioport:3000(size=128)
*-network DISABLED
description: Wireless interface
product: QCA9565 / AR9565 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlp2s0
version: 01
serial: 28:e3:47:02:df:c2
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=4.13.0-38-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:17 memory:b0400000-b047ffff memory:b0480000-b048ffff
My guess is a bad or poor-quality ethernet cable. Has that computer ever worked at Gbit? Have you tried any live CD's? Have you tried that ethernet cable on a machine that you know works at full speed? From the looks of it, it looks like a hardware issue.
I've never used lshw to determine speed, but you might want to try typing cat /sys/class/net/enp1s0/speed
and see what it says there.
Answered by Brian S. on February 8, 2021
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