Serviio

Does anyone know which TV currently supports the thumbnail HD profile setting?

<ThumbnailsResolution>HD</ThumbnailsResolution>

Or which other device except Xbox One or PS4?

My Samsung sets uses it, and the thumbnails do look better. My son-in-law has an JG 4K set (don't know the model) and it doesn't seem to make a difference on his. None of my other players display thumbnails at all, except the Roku. On the Roku the image looks good regardless of the setting.

Thanks for the reply.
You mean all of your Samsung TV's listed in your signatur are capable to show it?

Yes, both Samsung TVs will display the thumbnails. I was using a Samsung Blu Ray player, and it did not display thumbnails. My Panasonic TV and Sony boxes do not either. I also have a small Vizio TV that does not display thumbnails. I've only seen thumbnails on my Samsung TVs, the Roku boxes, and my son-on-law's LG 4K TV. Of course, there's a very large number of devices I've never seen, so don't take my statement to imply these are the only ones that show thumbnails.