I've noticed HD515 (Core M) iGPUs are very sluggish with 4k on Wayland. The same ultrabook runs extremely smooth on Windows, so I know it's not the underpowered GPU. After reading and trying everything about Glamor/UXA/SNA/Modesetting and hardware acceleration in Fedora I am more confused than ever. Does anyone have one of these low watt iGPUs driving a 4k linux portable very well? Mind you I am talking 2d desktop maybe a youtube video next to a browser at most. The thing slows to a crawl and even hangs. Can't even pretend to watch a 4k youtube.