My 4k TV doesn't support resolutions between 1920x1080 and 3840x2160

My Vizio d50u-d1 will do 4k but doesn't seem to like anything in between 1920x1080 and 3840x2160 displaying NO SIGNAL.


I wish it'd do

1.33x = 2560x1440 or
1.5x = 2880x1620 or
1.66x = 3200x1800

but it doesn't like those resolutions at all.

I thought I'd also try an interlaced signal at 3840x2160 that would allow 24hz to go to 48 hz.

$ ./cvt 3840 2160 48 -i -r -x

# 3840x2160 @ 48.00 Hz Interlaced Reduced Blank (CVT)
# field rate 48.00 Hz; hsync: 53.06 kHz; pclk: 212.25 MHz
Modeline "3840x2160_48.00i_rb" 212.25 3840 3888 3920 4000 2160 2163 2168 2185 Interlace +HSync -Vsync

$ xrandr --newmode "3840x2160_48.00i_rb" 212.25 3840 3888 3920 4000 2160 2163 2168 2185 Interlace +HSync -Vsync
$ xrandr --addmode HDMI-1 "3840x2160_48.00i_rb"
$ xrandr --output HDMI-1 --mode "3840x2160_48.00i_rb"

Sadly, "NO SIGNAL" was the result.

Oh well, it can do 25hz at 3840x2160 rock solid on my integrated intel graphics 2500 so I'm still happy. I sit in front of that 50" 4k screen and I feel like Tiny Elvis. Man, that thing is huge!