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I have a TP-Link WiFi USB adapter (model: TP-WN725N) which I use with a low end HP laptop (model HP 650, four years old). The OS of the laptop is Debian 9.4. I used to plug the WiFi adapter to the first left side USB slot of the laptop, and it works fine. Today I happen to plug the adapter on a different USB slot and noticed that I was unable to connect to the wireless network I've always used (WPA2 authentication method). Every time I got the following message in my logs:

R8188EU: sta recv deauth reason code(15)

Searching the Internet and looking at this question, it could be a driver problem or a cheap hardware issue, but why it works in the other slot then? What am I missing?

Thank you!

Keltari
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Alessandro Dotti Contra
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    It is not a driver problem, if it were a driver problem, the device wouldn't work in any USB port. You are plugging the device into a USB 2.0+ port I presume? – Ramhound Jun 20 '18 at 13:59
  • Yes, it's a USB 2.0 port. The technical specifications reports all USB slots as 2.0 compliant. – Alessandro Dotti Contra Jun 20 '18 at 14:44
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    Do other USB devices work well regardless of the slot they use? – Kamil Maciorowski Jun 20 '18 at 17:53
  • I've only used USB pen drives, but they all worked flawlessly. – Alessandro Dotti Contra Jun 20 '18 at 19:27
  • Likely there are several layers of drivers servicing the networking device, and it could be some security associations issue or something. To rule out any USB-level issues, you need to examine USB kernel logs when the device is plugged into "bad" port, or have some Linux version of USBTreeViewer, https://superuser.com/q/1180854/620011 – Ale..chenski Jun 21 '18 at 20:47

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