Had a lot of issues with the Asmedia USB ports on X58 refresh boards. Maybe 1 out of 15 boots they would work at POST, but not after loading the OS as the handoff process didn't work. Sometimes they wouldn't work at boot, but initialized fine after the OS loaded. I could tell by the numlock light on the keyboard, it was frustrating to put it mildly.
After updating your BIOS you should try all four BIOS options under the "Legacy USB Support" and see if one of them makes a difference. Legacy USB 3 will determine if they are USB 3 or not, you may disable this and try the four settings again just to see if the back ports can function in USB 2 mode. ASRock doesn't really give you more settings from the looks of the manual, for ASUS there are options to enable/disable the front and back ASmedia ports independently from one another and you might quickly check if ASrock has the same setting hiding someplace.
just brew it! wrote:
I believe all USB3.0 ports are controlled by an ASmedia chip.
There's your problem.
Yup. You're probably right. Though you'd think a company like Intel would have selected a half decent 3rd party provider to provide such an important (and at the time, cutting edge) bit of functionality to their flagship desktop platform.
My understanding is that it's the choice of the motherboard makers as to what 3rd party chips are used if they want extra ports or features not included on the Intel chipset, and so it is up to them to decide the implementation. So the only role Intel had in the mess was their decision to delay for so long incorporating USB 3 logic into its chipsets.