Question B150M Pro4V cannot set let both USB 3.0 and 2.0 in case front panel work, any idea?

wdgann

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Sep 12, 2013
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My motherboard is B150M Pro4V and case is CoolMaster N400. The front panel two usb 3.0 ports and two 2.0 ports "work" for years so I didn't find out the problem. Recently I bought an external SSD then I found out the USB 3.0 in front panel of the case actually just works as USB 2.0 with around 40mb/s. If I unplug then usb 2.0 cable from front panel to motherboard, then the two usb 3.0 port speed become 3.0 speed with over 100mb/s, but the two 2.0 ports do not work at all no response.

I check the bios and no setting related to this. Any idea? Thx!
 

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