Glad to hear the updated AMD drivers seem to have helped a bit.
Not finding much noteworthy on this particular TV, spec wise. (Which is odd - there’s countless threads online for some of the other popular TVs that people use as monitors - Seiki, Changhong, etc - but next to nothing on this Sceptre which has way better specs.)
Ultimately I suspect there’s probably a combination of factors contributing to the less-than-optimal experience:
-Input lag: TVs generally have a much higher input lag than PC monitors. Usually not noticeable when watching movies, but definitely noticeable with PC input, especially in conjunction with a lower refresh rate.
-GPU horsepower: I’m wondering if a faster graphics card would behave better (since the DisplayLink chip offloads some of the graphics processing to the primary video card). When DisplayLink originally released the 4k-capable DL-5500 chipset, they were advising that the AMD 5xxx series of GPUs was the minimum recommended series of card. They’ve since updated their requirements to list the 7xxx as the minimum recommended spec.
Though of course if you were going to update the graphics card, it would probably make sense to simply get one that supports 4K out of the box.
So given the above, it might make sense to return the USB graphics adapter and go with a replacement graphics card instead if the performance isn’t usable in the current state. If you wish to go this route, please send us an email to firstname.lastname@example.org and we can advise on the next steps for that.