ic, me too had an old motherboard but with Intel i7, which I shared an article previously HERE, the USB 3.0 on P7H55-M LX/USB3 can be detected but no respond when inserting USB thumbdrive but other USB 2.0 ports work very well, in fact all eight USB 2.0 ports tested are fine.
I do not want to downgrade the kernel just to support the motherboard built-in USB 3.0, therefore planning to get a new extension port for any USB 3.x devices.
I will share the outcome here once tested the Niki PCIe 4X Expansion Card USB 3.1 Gen2.
Thanks again.