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I am running Ubuntu 18.04.4 server on a system that I have attached to it a Realtek 8156 2.5 Gbps ethernet USB adapter. While this adapter otherwise works when attached to a USB 3 port, my syslog is full of lines that look like this:

Apr 16 06:25:06 master kernel: [193945.748989] cdc_ncm 2-2:2.0 usbeth0: 2500 mbit/s downlink 2500 mbit/s uplink
Apr 16 06:25:06 master kernel: [193945.780987] cdc_ncm 2-2:2.0 usbeth0: network connection: connected

These lines get emitted every 30 ms or so. This makes my syslog rather unusable.When I detached the USB adapter, the log lines stop, but I do want this adapter attached, so that's not a workable solution.

How can I get these log lines to stop?

kamprath
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1 Answers1

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So it turns out that in Ubunutu 18.04 the built in driver support for the Realtek 8156 chip is not complete. The solution to my problem ended up being manually compiling and installing the device drivers from RealTek. The Linux driver can be downloaded here. The driver does need to get built, so you need to install the build-essential package via apt. The driver download's README has information on how to instal the kernel module once it's built. Once I installed this driver, all the spammed messages in syslog went away (yay!).

kamprath
  • 121