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Bart
Asked: 2018-12-05 02:12:59 +0800 CST

Ubuntu 18.04 Ethernet device not found (WiFi working fine)

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I am using a brand new Dell XPS 13 9370 (developer edition with Ubuntu 18.04) with Dell dock WD15 (which has a RealTek Gigabit ethernet adapter). The wired connection was working on the first day or two after set-up, but now the device is not found and only WiFi is working:

bart@bart:~$ ifconfig -a
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
    inet 127.0.0.1  netmask 255.0.0.0
    inet6 ::1  prefixlen 128  scopeid 0x10<host>
    loop  txqueuelen 1000  (Local Loopback)
    RX packets 2796  bytes 263389 (263.3 KB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 2796  bytes 263389 (263.3 KB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
    inet 10.16.60.2  netmask 255.255.192.0  broadcast 10.16.63.255
    inet6 fe80::66a1:cfc:5a38:e81c  prefixlen 64  scopeid 0x20<link>
    ether 9c:b6:d0:92:e2:47  txqueuelen 1000  (Ethernet)
    RX packets 14541  bytes 9101768 (9.1 MB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 10748  bytes 1753428 (1.7 MB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

There are no wired internet settings available in the Ubuntu GUI either, only wireless settings...

bart@bart:~$ sudo lshw -C network
 *-network                 
   description: Wireless interface
   product: QCA6174 802.11ac Wireless Network Adapter
   vendor: Qualcomm Atheros
   physical id: 0
   bus info: pci@0000:02:00.0
   logical name: wlp2s0
   version: 32
   serial: 9c:b6:d0:92:e2:47
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=ath10k_pci driverversion=4.15.0-1028-oem firmware=WLAN.RM.4.4.1-00079-QCARMSWPZ-1 ip=10.16.60.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11
   resources: irq:134 memory:dc000000-dc1fffff

Any help would be greatly appreciated!

networking drivers internet dell ethernet

1 Answers

  1. The solution was to disable ehci_hcd kernel module loading by creating the following file:

    bart@bart:/etc/modprobe.d$ cat blacklist-test.conf
blacklist ehci_hcd

    I'm not sure exactly why this works, but it fixed my problem.

    If anyone could offer an explanation or comments on side effects of this solution, I would be very grateful!

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