Got another question,

I've been working on this for a few days now, and I cannot get it to work at all. :(

I know it works in Windows, but Linux is hanging me up.

Here are my specs:

nvidia GTX970,

Vizio M43-C1 4k TV

And if it matters:

Asus Z170a

Intel i5 Skylake

What I've tried:

-Setting it through nvidia panel
(Have 2 entries for 60Hz, one reports failed to set metamode and the other gives a black screen with no signal)

-Setting it through xrandr

xrandr --output HDMI-0 --mode 3840x2160 -r 59.94 --verbose (and)

xrandr --output HDMI-0 --mode 3840x2160 -r 60 --verbose

This reports at fail:

screen 0: 3840x2160 945x532 mm 103.13dpi

crtc 0:    3840x2160  59.94 +0+0 "HDMI-0"

xrandr: Configure crtc 0 failed

crtc 0: disable

crtc 1: disable

crtc 2: disable

crtc 3: disable

screen 0: revert

crtc 0: revert

crtc 1: revert

X Error of failed request:  BadValue (integer parameter out of range for operation)

  Major opcode of failed request:  140 (RANDR)

  Minor opcode of failed request:  21 (RRSetCrtcConfig)

  Value in failed request:  0x0

  Serial number of failed request:  54

  Current serial number in output stream:  54

-Updated the drivers to latest beta (370.xx)

Any insight would be appreciated, thank you. For now I'm off to work!

Edit:
Some research here, I hope it can be helpful.

1. 
   

   Threads from nvidia linux dev forums:
   https://devtalk.nvidia.com/default/topic/939971/linux/4k-60hz-works-in-windows-not-in-linux-bounty-offered-for-fix-/1
   **Edit 3: Workaround may have been found for me in this thread.

   
   
   

   https://devtalk.nvidia.com/default/topic/950134/linux/4k-on-hdmi-2-0/
   This guy says resolved but I really cannot gather what he even did.

   
   
   

   https://devtalk.nvidia.com/default/topic/818079/linux/980gtx-no-support-for-4k-60hz-4-2-0-only-30hz-/post/4496595/#4496595
   And apparently this guy got it working with 349.12 drivers from over a year ago? What? This one was a real gut punch.

   
   


2. 
   

   Some info from my system that makes me want to pull my hair out:
   
   From /var/log/Xorg.0.log:

   
   
   

   
   

   [ 8026.035] (--) NVIDIA(GPU-0): VIZ M43-C1 (DFP-1): connected
   
   [ 8026.035] (--) NVIDIA(GPU-0): VIZ M43-C1 (DFP-1): Internal TMDS
   
   [ 8026.035] (--) NVIDIA(GPU-0): VIZ M43-C1 (DFP-1): 600.0 MHz maximum pixel clock

   
   

   
   
   

   So 600MHz max? Okay...

   
   
   

   xrandr --verbose
   
   
   
   
   
   3840x2160 (0x1c6) 593.410MHz +HSync +VSync
   
   h: width  3840 start 4016 end 4104 total 4400 skew    0 clock 134.87KHz
   
   v: height 2160 start 2168 end 2178 total 2250           clock  59.94Hz
   
   

   
   
   

   I may be missing something fundamental here, I'm not sure. Seems to check out to me (600MHz vs 593.410MHz,) am I wrong?

   
   


3. 
   

   As per my TV's specs, HDMI port 5 can support up to 1080p at 120Hz and 4k at 60Hz.

   
   
   

   xrandr --output HDMI-0 --mode 1920x1080 -r 119.88
   
   

   
   
   

   This works fine, and I achieve 120Hz on 1080p.
   
   120Hz on 1080p results in horizontal lines flashing across the screen intermittently.

   
   

For now I think it's time for bed.

Edit 2:

Still no luck here, but some new luck came my way- My EVGA step-up to 1070 finally started. Will report back on changes (if any) after installing.

Edit 3:

It would appear that I may be incredibly lucky. While others with a similar issue have been waiting for months, I have the timing to step in and only wait a few weeks. I'll have to wait for my new card to come in to test it, but it looks promising. nVidia has acknowledged it as a bug in the drivers and provided a EDID from another TV in the meantime to override with that appears to make 60Hz on 4k work at the cost of losing 120Hz on 1080p. I can't wait to test this!

For any of you facing a similar issue, a workaround has been found until nvidia releases their next driver and it works its way into repos.
With this workaround, you will lose the option to display 1080p at 120Hz.

First, please see:
https://devtalk.nvidia.com/default/topic/939971/linux/4k-60hz-works-in-windows-not-in-linux-workaround-found-/post/4959257/#4959257

Download the edid from that post. Note where you store it.

Note: It is possible to break your display manager if this is done incorrectly, or if your monitor isn't the same as mine. Be ready to start in recovery to remove this next file we create to reverse the issue.

If you are on 16.04 like myself, there is no xorg.conf file and if you make one, it has a mind to vanish with every system update. Instead, navigate to:

cd /usr/share/X11/xorg.conf.d

Next, create a new file here. It's important that you use superuser permissions. Personally, I just sudo gedit, others tell me I'm bad for it.

sudo gedit 50-nvidia.conf

Paste the following into it:
If you do not have a Vizio M43-C1, please create your own xorg settings through the nvidia control panel and add the last Option to yours. You only need the Monitor section. I will bold what you need to add.

#Not First Line

Section "Monitor"

    # HorizSync source: edid, VertRefresh source: edid

    Identifier     "Monitor0"

    VendorName     "Unknown"

    ModelName      "VIZ M43-C1"

    HorizSync       15.0 - 140.0

    VertRefresh     25.0 - 76.0

    Option         "DPMS"

    Option         "CustomEDID" "HDMI-0:/path/to/edid.txt"

EndSection

#Not Last Line

Option "CustomEDID" "HDMI-0:/path/to/edid.txt"
This is the workaround.

Note that HDMI-0 needs to be replaced with your current display.

To find yours, run:

xrandr

From the output, find the one that says connected. For example,

HDMI-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm

Shows my display is HDMI-0, so this is what I use in my 50-nvidia.conf.

After you're done, simply reboot. If all done correctly, you should be able to login normally and set 4k @60Hz 4:2:0 with no problem.

Again, this is just a workaround. Hopefully no one will ever need to do this in a few months when the new driver is released.

I was having a similar problem with an LG 4k TV, but it turns out that I had to enable the option "HDMI ULTRA HD Deep Colour" on the tv to make it work.

haved you tried to install nvidia property driver by running

apt install nvidia-384

It saved my day