I recently bought a 5DsR (was using a 5D MkII before that). I shoot tethered and have been using a Tethertools 15' USB2 cable. Because the 5DsR is USB3, I purchased a Tethertools 15' USB3 cable. I plugged it into my USB3 port on my Lenovo Yoga 2 Pro.... and nothing. Thinking that something might be wrong with the port on the laptop, I tried it again with the USB3 port on my newer Lenovo Yoga 900... and nothing. Just for the heck of it, I plugged the USB3 cable into the USB2 port on the Lenovo Yoga 900 and the camera was instantly recognized. I tried this on the USB2 port on the Lenovo Yoga 2 Pro and the camera was instantly recognized. While that seems nice, I want USB3 speed, not USB2.
Summarizing, USB3 cable does not work in USB3 ports but does work in USB2 ports, giving me USB2 speeds
I read on Tethertools site that there are known issues with USB3 and tethering and they offer a "TetherBoost Pro USB 3.0 Core Controller" to resolve the issue. I bought it. Zero difference.
I also read that due to power saving settings in Windows 10, some USB ports can be underpowered. I turned off all of Windows' ability to change the power to the USB ports.
Testing a bit further, I found another interesting thing. If I take my old USB2 Tethertools cable, add an adapter to it so it can connect to the camera, I can plug into the Lenovo USB3 port and the camers is recognized immediately. These are the SAME ports that don't recognize the camera when using the USB3 cable! Again, this only give me USB2 speeds so my problem isn't resolved, PLUS I have to use an adapter that is easy to lose.
Summarizing, USB2 cable works in USB3 ports, giving me USB2 speeds.
I tried calling Tethertools about this and their support, while courteous, was less than useless.
I feel like all I want is a very simple thing - My USB3 camera to use a USB3 cable to plug into a USB3 port and give me USB3 speed. So far? Not happening.
Any help or advice that could be offered would be greatly appreciated,