TV resolution 1366x768 is scrambled


I’ve connected the VIM1 using HDMI to a TV which is “720p”, but the native resolution is actually 1366x768. The VIM uses that resolution by default when booting and also with the desktop. The problem is that the image is scrambled. It’s like the pixels are shifted or rotated horizontally and differently on each line, repeating every 4 lines. The first line is clearly shifted right by 4 pixels, because there are 4 black pixels before the white of the top bar. I can provide a picture if that will help. 1280x720 works and 1280x768 works.