Nothing in 5 days... still have same problem. Cant game, as xbox 360 receiver is not happy in a usb hub
BIOS USB settings for Solus/ GA-990FX-GAMING
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Are you sure it isn't a hardware issue?
Not a hardware issue. All ports worked under previous OS (win10prox64) and even with solus as a virtual machine under windoze.
Since install I have tried all different settings and have at best gotten 2x3.1 and 1x3 USB ports to works. I have to run mouse, kB, camera via a hub on one and external drive and Xbox 360 receiver on their own ports or they don’t work/work well. Seems like a big compromise when the MB has like 5 other USB ports.
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Drewfus Have you tried another Linux OS eg. via a live USB?
not yet. I have a few live OS disks/usb I'll see whats up booting like that. Didn't have a problem with any live OS's on disk or usb before the Solus install, so that can be telling. I'll give it a try when I get home
With CD based live versions of Solus and Tails I still have no legacy USB access. I didn't try usb with a live distros because I need all 3 active USB for KB Mouse and external drive
So my USB issue is either hardware related, which I doubt as they all worked right up to moment of Solus install, or more likely BIOS, right? So back to OP, what BIOS settings are you all using on Gigabyte Mobos as far as UEFI, handoff, legacy support. and so on. Sucks to have to choose between gaming (plugging in my xbox360 receiver) or access to my media files (plugging in external drive)
I know this isn't helpful with your current situtation, but is advise that might help in the future.
Get a system with a metric ton of connectors (USB). I have like 8 on my back plane, and 4 in front. I think two on each are USB 3 and the rest are USB 2.
I've actually never had a USB connector that works in one OS and not in another, so I don't really have any other suggestions, but at least if you have a lot, chances are some will work (lol).
USB ports that do not work will still pass .5v for charging power etc, they just don't pass data/aren't seen by the OS
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I see. Well at least you basically had plenty. I wish you luck, I don't believe if they were functional in other OS, that any bios modifications should be necessary. Though Windows has a reputation (probably deserved) of drivers that work around iffy hardware. Another possible solution would be a USB hub device, they're cheap and I bought one for my server. I'd attach the slow devices to it and put the drive on another port if you did that.
Hey, you're ahead of me at every turn. Lol.
during install of Soulus my KB and mouse "disappeared " as they were in legacy ports, so to even complete install I had to unplug all other USB devices and find the USB ports that were still "active", those being the 3 usb 3 flavored ones that continue to work. No change I have tried in BIOS so far has enabled the rest of them.
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Is your power supply capable of providing enough current for all the devices? In other words, does the situation get worse if you plug in more peripherals?
850 watt Corsair with 4 x.5v rails running only one low draw video card
Hmmm, does not sound like a Solus issue, as these stuff are either hardware related (which concerns the Linux kernel as that handles the hardware) or BIOS related. We would know for sure if you could use a live CD/USB to test it under another distribution. That is a fairly mature motherboard so I assume the latest kernel update would not fix it either... Unfortunate part is, it is difficult to suggest anything BIOS related without having access to a motherboard that has the same BIOS. I am stumped, sorry 
to update, I have tried live cd of Manjaro, Tails, Kali, Solus all with same issue. Legacy usb ports pass .5v, BUT no data/ OS recognition