From
https://lore.kernel.org/netdev/1e6d7b8c3af444ae900fd4248f2a9...@realtek.com/
There are three configurations for RTL8156.
config #1: vendor mode (r8152)
config #2: NCM mode (cdc_ncm)
config #3: ECM mode (cdc_ether)
The USB core selects config #2 for default, so cdc_ncm is loaded.
If you plan to use vendor mode, you have to switch the configuration
to config #1. For example,
echo 1 > /sys/bus/usb/devices/2-7/bConfigurationValue
So this does not seem to be considered a kernel bug.
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https://bugs.launchpad.net/bugs/2000805
Title:
rtl8156B loaded with wrong driver and not working
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have a 2.5G USB Ethernet dongle that use the Realtek 8156B chipset.
The default driver being loaded are cdc_mbim and cdc_ncm, but this
driver (cdc_ncm) is an incorrect driver that does not work with the
chip. Instead, I have to manually load the r8152 driver to make it
work; I cannot blacklist cdc_ncm as I am also using it with other
devices.
Current Platform: Ubuntu 22.04.1, kernel 5.15.0-56-lowlatency
Reproducible: always
Expects: plugging in the USB dongle will have correct driver loaded, and just
work
Steps to fix:
-----------------------------------
rmmod cdc_mbim
rmmod cdc_ncm
rmmod cdc_ether
modprobe r8152
echo 0bda 8156 > /sys/bus/usb/drivers/r8152/new_id
-----------------------------------
reference links:
https://forum.manjaro.org/t/no-carrier-network-link-problem-with-usb-2-5-gbit-lan-adapter-realtek-rtl8156b-on-x86-64/97195
https://lore.kernel.org/netdev/20211227182124.5cbc0...@kicinski-fedora-pc1c0hjn.hsd1.ca.comcast.net/#t
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