Got a 4k tv but my integrated video can't make a 4k signal...or can it?

Well, I finally got a 4k tv, but now I've realized that no piece of computer equipment that I have will make a 4k resolution signal...

Or so I thought...

I read this page about going to 3840x2160 resolution with cvt and reduced blanking and thought I'd give the modeline a go:



https://superuser.com/questions/1323967/how-can-i-set-display-resolution-to-3840x2160-with-intel-graphics-3000/1323969#1323969

Also I found some interesting stuff at: https://medium.com/@ValdikSS/how-to-use-high-resolutions-with-older-hardware-58577d91b1f8



Using the modeline from 3840x2160 24 reduced blanking and it works!!!

xrandr --newmode "3840x2160_24.00_rb" 209.75 3840 3888 3920 4000 2160 2163 2168 2185 +HSync -Vsync
xrandr --addmode HDMI-1 "3840x2160_24.00_rb"


I can play youtube at 1440p, 2160p seems to tax my system too much, and it looks beautiful!

Xrandr says that it's an HDMI port but it's a DVI port on the back of the computer and I'm using a DVI to HDMI cable.


lspci says I have

00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)

Ubuntu 18.04 says that I have a Intel® Core™ i3-3220 CPU @ 3.30GHz × 4 and my graphics are Intel® Ivybridge Desktop.

According to intel's website the i3-3220 has Intel® HD Graphics 2500.

I don't know exactly what the maximum pixel clock is for the HD Graphics 2500, but according to https://www.x.org/docs/intel/IVB/IHD_OS_Vol3_Part4.pdf Ivy Bridge it's limited to 225 mhz which is just above the 209.75 dot clock in the 3840x2160_24.00_rb modeline. I'll bet I could get 25 fps instead of 24 to fit just under 225 mhz. For now, it's totally stable so I'm really happy.