Driuchatyi Nikolay:
>"I have installed Windows to re-check this issue. Unfortunatelly, adapter works automatically only on 100 Mbps. Forced setting up to 1Gbps didn't help - link is down."
If this is reproducible with the latest driver version from Windows, you could call the manufacturer to inquire about if there is a firmware update that could be applied to fix this problem. If not, you could request a replacement of the same model where they updated the hardware to do as advertised.
Circling back to linux, a quirk could be added that automatically invokes the WORKAROUND you noted in your Bug Description, given it doesn't just work when you plug it in.
Driuchatyi Nikolay:
>"I have installed Windows to re-check this issue. Unfortunatelly, adapter works automatically only on 100 Mbps. Forced setting up to 1Gbps didn't help - link is down."
To clarify, you are downloading the latest version from ftp://driver. jmicron. com.tw/ Ethernet/ Windows/ ?
>"Seems like it is a hardware problem."
If this is reproducible with the latest driver version from Windows, you could call the manufacturer to inquire about if there is a firmware update that could be applied to fix this problem. If not, you could request a replacement of the same model where they updated the hardware to do as advertised.
Circling back to linux, a quirk could be added that automatically invokes the WORKAROUND you noted in your Bug Description, given it doesn't just work when you plug it in.