if I read it correctly - per the LG documentation @4K /60fps the 4:4:4 deep color chroma sampling only works on the hdmi input at 8 bits (not 10 or 12) , which is consistant with earlier statement of hdmi 2.0 capability.
High Speed HDMI Cable 4K@60hz 10bit
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Caporegime
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Yes I think we have arrived at a consensus on this
. So best we can get out of HDMI 2.0 is 4K@60HZ 8-bit 4:4:4.I will be receiving the KabelDirekt cable today and report back.
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The cable has arrived and bad news is that the problem is still there. As I see it, there are four elements to this problem; i.e. HDMI Cable, TV, GPU and the Nvidia drivers/support.
- HDMI Cable: I have tried 3 High Speed HDMI cables. All of them are rated at 18gbps and above. Other people are successfully able to outpu 4K@60HZ 8-Bit 4:4:4 using these cables. Therefore, I am ruling out that cable is a problem.
- TV: I have checked with Sony technical team and they have confirmed that TV should be able to support 4K@60HZ 8-bit 4:4:4. Also Rtings.com website confirm that TV supports this output. http://uk.rtings.com/tv/reviews/by-usage/pc-monitor/best
The TV model in UK is Sony 55XD7005 (US model XBR55X700D). It's a 8 bit panel + FRC and 10 bit, 12 bit are selectable; though not sure how much of an improvement that can have. I have a 4K monitor with HDMI 2.0 input and that can display this output over HDMI 2.0 only when on desktop. As soon a game is launched display goes blank. So TV itself is not the problem.
- GPU: As I mentioned earlier I have gtx 980's in 2x sli. I have tried with and without SLI but no success. I was thinking that it may be my 1st gpu port or something else on the board. So I switched to the second card and same result. So hardware wise there is no obvious problem.
- Lastly the only aspect I am unable to troubleshoot is the driver side of the things. I am using the latest Nvidia drivers and under the impression that all the HDMI 2.0 limitations have long been lifted since the launch of Maxwell 2. I will use DDU to completely uninstall the drivers and reinstall. But I have little belief if this will change much. Is there any other setting you people can think of that might have been messing around?
- HDMI Cable: I have tried 3 High Speed HDMI cables. All of them are rated at 18gbps and above. Other people are successfully able to outpu 4K@60HZ 8-Bit 4:4:4 using these cables. Therefore, I am ruling out that cable is a problem.
- TV: I have checked with Sony technical team and they have confirmed that TV should be able to support 4K@60HZ 8-bit 4:4:4. Also Rtings.com website confirm that TV supports this output. http://uk.rtings.com/tv/reviews/by-usage/pc-monitor/best
The TV model in UK is Sony 55XD7005 (US model XBR55X700D). It's a 8 bit panel + FRC and 10 bit, 12 bit are selectable; though not sure how much of an improvement that can have. I have a 4K monitor with HDMI 2.0 input and that can display this output over HDMI 2.0 only when on desktop. As soon a game is launched display goes blank. So TV itself is not the problem.
- GPU: As I mentioned earlier I have gtx 980's in 2x sli. I have tried with and without SLI but no success. I was thinking that it may be my 1st gpu port or something else on the board. So I switched to the second card and same result. So hardware wise there is no obvious problem.
- Lastly the only aspect I am unable to troubleshoot is the driver side of the things. I am using the latest Nvidia drivers and under the impression that all the HDMI 2.0 limitations have long been lifted since the launch of Maxwell 2. I will use DDU to completely uninstall the drivers and reinstall. But I have little belief if this will change much. Is there any other setting you people can think of that might have been messing around?
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Caporegime
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Stupid question - You followed these instructions?
The X700D can display Chroma 4:4:4 at 4k @ 60Hz only on the HDMI port 2 and 3 and you need to switch the 'HDMI signal format' to 'Enhanced format'. When the picture mode is set to 'Graphics' or 'Game' the input lag is 31.4ms.
I doubt it's the GPU. I have Titan X SLI (Maxwell 2) which is the same GPU family as you are using and 4k@60hz with 4:4:4 is working fine for me on my Panasonic AX802B
Which brand of 980 is it?
The X700D can display Chroma 4:4:4 at 4k @ 60Hz only on the HDMI port 2 and 3 and you need to switch the 'HDMI signal format' to 'Enhanced format'. When the picture mode is set to 'Graphics' or 'Game' the input lag is 31.4ms.
I doubt it's the GPU. I have Titan X SLI (Maxwell 2) which is the same GPU family as you are using and 4k@60hz with 4:4:4 is working fine for me on my Panasonic AX802B
Which brand of 980 is it?
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Yes I have tried both HDMI 2 & 3. Also I have selected the Enhanced Mode. Tried game and graphics mode with no luck. You got the same tele?
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Caporegime
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Sadly not, I have a Panasonic TX-58AX802B
You said
you mean you were sending same format from the PC and that was successfully showing a picture on tv, up to the point you started the game ?
I have seen some cable problems that are content specific - cross-talk/degradation that occur only with some content.
Maybe the Sony hdmi connection phis/io's have less electrical tolerance than the 4K monitor to signal degradation
were other successful folks using same 5m length - have you tried shorter ?
you mean you were sending same format from the PC and that was successfully showing a picture on tv, up to the point you started the game ?
I have seen some cable problems that are content specific - cross-talk/degradation that occur only with some content.
Maybe the Sony hdmi connection phis/io's have less electrical tolerance than the 4K monitor to signal degradation
were other successful folks using same 5m length - have you tried shorter ?
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No TV doesn't budge when i send a 60hz signal but monitor manages to display desktop and goes blank on launching a game. I have tried a different brand 2M High Speed HDMI cable with similar problems.
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OK : have you tried playing a 4k/60fps video on the desktop to monitor, and will that then fail to display.
Can audio interleaved with the video across hdmi, ever impact video integrity causing a loss of display (so try changing audio format) or does game enforce an hdcp2.2. handshake that is not required with desktop.
Can audio interleaved with the video across hdmi, ever impact video integrity causing a loss of display (so try changing audio format) or does game enforce an hdcp2.2. handshake that is not required with desktop.
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Tried 2m, 4.5m and 5m. All cables do 4K 30hz 4:4:4. 4K 60hz 420 only.
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Yes 60fps video works on monitor. I disabled audio over hdmi but still no success. I also completely uninstalled the drivers and reinstalled. Doesn't work.
50£ cable no longer than 0.5m? Is that the answer :d
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And TV screen is time to time going black if I use 1080p@60fps 4:4:4. Really confused now.
you are just running one display at a time ?: not a 1080p monitor plus either 4k tv or monitor.
otherwise when you start full screen game (and it goes black) are you re-ngotiating hdmi because primary display has been swapped say ?
nvidia control panel reports protocol being used to drive a screen so can you get to that whilst game is driving screen (maybe attach another screen or rdp)
I have had hdmi negotation problem, between humax box and sharp tv where tv must always be turned on before box, otherwise black screen, some generic suggestions are documented here
otherwise when you start full screen game (and it goes black) are you re-ngotiating hdmi because primary display has been swapped say ?
nvidia control panel reports protocol being used to drive a screen so can you get to that whilst game is driving screen (maybe attach another screen or rdp)
I have had hdmi negotation problem, between humax box and sharp tv where tv must always be turned on before box, otherwise black screen, some generic suggestions are documented here
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I have tried one display at a time; i.e. Only TV connected. It didn't change anything. Unfortunately I don't have any equipment at home other than PC, which can output 4K. Otherwise it would have been easier to narrow down the problem.
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Already tried 50hz and no go. Panel is definitely 60hz looking at the manual. It can do 4K@60hz 420 without issues.
Yeah i tried that the only options i can get to work are
1: 4k@60hz with YCBCR 4.2.2 @ 8 or 10 or 12 bit = Works and tested.....
2: 4k@60hz with YCBCR 4.4.4 @ 8 Bit = Works and tested....
3: 4k@60hz with YCBCR 4.2.0 @ 8 or 10 or 12 bit = Works and tested....
4: 4k@60hz with YCBCR 4.4.4 @ No bit depth shown in the NV panel if i force 10bit then change YCBCR to 4.4.4 then gets blanked out or greyed out.... though its probably 8bit, just cant verify it..
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So my best options are due to HDMI 2.0 being on my cards and HDMI 2.0a on my TV i would need the HDMI port on my graphics card updated to 2.0a to get the higher bandwith required to get 4.4.4 @10 bit.
still you will probably be hard pressed to notice the difference between 4.4.4 8bit and 4.4.4 10 bit unless you had both panels side by side with one working @ 8 and other at 10
the option that i use is selection number 1 @10bit reason why cause my panel is 10 bit and i can select that and that selected sticks and 4.2.2 vs 4.4.4 gonna be hard to tell the difference....
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