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4k 60Hz HDR not working on LG B6 OLED

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post #1 of 12 (permalink) Old 09-09-2017, 08:20 AM - Thread Starter
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Edit: The LG B6 OLED can do 3840x2160 60Hz HDR at 422. It cannot do 4096x2160 60Hz HDR at 422.

Hi Guys,

I have a 55” LG 2016 B6 4k OLED TV, connected to a Pioneer VSX-530-K Receiver, connected to a Nvidia 1080 Ti using 6’ 18gpbs AmazonBasics HDMI High speed cables for each connection.
TV firmware: 4.31.20
Nvidia Driver: 385.41
I enabled 4k60p 4:4:4 passthrough on the Receiver and HDMI Ultra Deep Color on the TV.

I started playing around with the settings in Nvidia control panel and windows display settings to make sure I was getting the most out of my setup and noticed a few things.
By default, I was running in Nvidia:
Resolution 4096 x 2160 60Hz
Output color depth: 8 bpc (isn’t this a 10 bit panel?)
Output color format: RGB (is RGB better than YCbCr444?)
Output dynamic range: Limited (Why isn’t this set to full?)

In Windows Display Settings
HDR and advanced color: Off

If I switch over to “Use Nvidia color Settings,” then I can immediately set the dynamic range to Full, but HDR does not turn in Resident Evil 7. If I attempt to switch on HDR and advanced color in Windows display settings it will attempt and immediately revert back without giving me any options.
The only way I can switch the HDR and advanced color setting on is to switch the Nvidia color settings back to default, which grays out all options. This however causes severe color distortion with vertical bands on the screen though technically 4K:60Hz:HDR is on in Resident evil 7.
New defaults running in Nvidia:
Resolution 4096 x 2160 60Hz
Output color depth: 10 bpc
Output color format: YCbCr422
Output dynamic range: Limited but HDR is on???

In Windows Display Settings
HDR and advanced color: On

So maybe this is a bandwidth issue not being able to do 4k:60Hz:HDR?
I downgraded the refresh rate to 30Hz
New defaults running in Nvidia:
Resolution 4096 x 2160 30Hz
Output color depth: 12 bpc (higher than the panel?)
Output color format: YCbCr422 (changeable to 444 Limited or RGB with Full)
Output dynamic range: Limited with 422 or 444 but full with RGB

In Windows Display Settings
HDR and advanced color: On

At 30Hz Resident Evil 7 is in HDR for sure and so is normal windows 10.


From Rtings.com, I expect to be able to perform 4K:60Hz:HDR but not 4K:60Hz:4:4:4:HDR as they have measured the input lag

4k @ 60Hz @ 4:4:4 : 70.9 ms
4k @ 60Hz + HDR : 28.5 ms
4k @ 60Hz @ 4:4:4 + 8 bit HDR : N/A

However, I am unable to ever get to 4K:60:HDR on without the vertical banding color distortion. I decided to take the receiver out of the mix and still have the same issue. Is it the panel, the cables, or the GPU? What am I doing wrong?



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post #2 of 12 (permalink) Old 09-09-2017, 08:28 AM
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I think you need to do 4K 60Hz at 422 so you can do HDR. Right now HDR is pointless for PC because of HDMI 2.0 limitation. HDR need double the BW.

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post #3 of 12 (permalink) Old 09-09-2017, 08:35 AM - Thread Starter
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Quote:
Originally Posted by ZealotKi11er View Post

I think you need to do 4K 60Hz at 422 so you can do HDR. Right now HDR is pointless for PC because of HDMI 2.0 limitation. HDR need double the BW.

When HDR turns on, it automatically defaults down to 422 and that is what is showing the color distortion/vertical banding. With HDR/advanced color on in windows, I can't really change anything without it turning HDR off.



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post #4 of 12 (permalink) Old 09-09-2017, 09:53 AM
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Quote:
Originally Posted by ChickenInferno View Post

When HDR turns on, it automatically defaults down to 422 and that is what is showing the color distortion/vertical banding. With HDR/advanced color on in windows, I can't really change anything without it turning HDR off.

There is nothing else you can do.

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post #5 of 12 (permalink) Old 09-09-2017, 10:03 AM
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Quote:
There is nothing else you can do.
you beat me to it lol.

that's correct. you've done the max you can push out of the HDMI.

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post #6 of 12 (permalink) Old 09-09-2017, 10:17 AM
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HDR is just one of those thing early adopters are going to face a lot of problems. I recently got HDR TV which is not as good as your and found the limits of the technology right now. It was more trouble than worth. Will not touch HDR until 4K 60Hz RGB (4:4:4).

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post #7 of 12 (permalink) Old 09-09-2017, 10:22 AM - Thread Starter
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Quote:
Originally Posted by ZealotKi11er View Post

There is nothing else you can do.

Quote:
Originally Posted by Cloudforever View Post

you beat me to it lol.

that's correct. you've done the max you can push out of the HDMI.

So my problem with this has been that it should be theoretically possible to do 4K 60Hz HDR at 422 but not 444....I needed to check my definition of 4k. The LG B6 is 4096x2160, which is not possible to do 60Hz HDR, but 3840 x2160 60Hz HDR is possible. As soon as I lowered the resolution the color banding went away.

Wow this was stupid of me.



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post #8 of 12 (permalink) Old 09-09-2017, 10:26 AM
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Quote:
Originally Posted by ChickenInferno View Post


So my problem with this has been that it should be theoretically possible to do 4K 60Hz HDR at 422 but not 444....I needed to check my definition of 4k. The LG B6 is 4096x2160, which is not possible to do 60Hz HDR, but 3840 x2160 60Hz HDR is possible. As soon as I lowered the resolution the color banding went away.

Wow this was stupid of me.

Yeah 4K we always mean the 16:9 variant.

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post #9 of 12 (permalink) Old 09-09-2017, 11:21 AM
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glad you can get it at that res. not really any difference between such a small reduction on that. but glad it was resolved smile.gif

dont feel dumb, ive done it before too! that's why we're here lol to ask each other questions on what the heck we're doing just for double checking

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post #10 of 12 (permalink) Old 10-02-2017, 02:23 PM
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Hi

LG 65UJ750V
Nvidia Driver: 385.69
Dacota 5m 21Gbps Hdmi cable
Win 10 ver1607

Dont know much about HDR, when starting Battlefield 1, TV detects HDR and deepcolormode and its possible to adjust some white box inside game gfx setttings. Works out of the box and is damn fun in 1080p120Hz
When I exit Battlefield 1, TV stays in HDR mode and everything is now in HDR (desktop or any game)
Only way to turn it off is by changing back to monitor in Multiple Display settings in nvidia control panel


Cant find any HDR and advanced color options in Windows Display Settings
Where to look for
Output color depth:
Output color format
Output dynamic range

???

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