I have Asus N580VD laptop which has two USB 2.0 ports, one USB 3.0 port type A and one USB 3.1 port type C.
Yesterday I was tinkering with an Android phone, rebooting it in different modes. It was connected to the USB 3.0 port. Plugged it out and in from time to time. At the same time some Windows updates were installed in the background.
At one point I've noticed it stopped being recognized. Later I've noticed that USB 3.0 devices (I have a USB 3.0 flash drive) work just fine there. But no USB 2.0 devices are recognized. However, they are still powered, the port supplies power.
There's a similar question (USB 3.0 port no longer recognizing USB 2.0 devices, seems to still work with USB 3.0 devices), which describes the same situation, only my OS is Windows 10 x64.
There is an answer suggesting the port is physically damaged (namely, USB 2.0 pins). But a comment asserting that USB 3.0 negotiation takes place on USB 2.0 pins makes me wonder if it's really the case.
Can I somehow pinpoint the cause for the problem and fix it, if possible?
I have a flash drive with Live Ubuntu installation, and the port doesn't work for USB 2.0 devices there either. However, I can try to look at some Linux logs, if someone tells me where to look.
Maybe there are two chips for that port inside my laptop, one working with USB 3.0 devices and the second one working with USB 2.0 devices, and the latter is now burnt?