Custom Resolution Utility (CRU)

[ToastyX]

(08-19-2019 03:44 PM)EeK Wrote:  With the B7 and C8 (which only support 1080p@120Hz), I connected my PC to the receiver (a Denon AVR-X4400H) using my GPU's (1080 Ti) single HDMI out. If I do that with the C9, only 1080p is available at 120Hz, for some reason (4K@60Hz works flawlessly).

eARC is currently not working with my TV and AVR (known issue between 2017 Denon receivers and the C9), and regular ARC causes massive audio delay (also a known issue on LG OLEDs). So, the only alternative to have 1440p@120Hz video on the TV and audio coming out of the speakers connected to my AVR, was to connect the GPU directly to the TV (through HDMI), and use one of its three DisplayPort outs to connect a second HDMI cable to the AVR (using a DP to HDMI adapter).

Now, the problem. Windows sees those connections as two individual displays. I can either extend or clone the picture from the primary display (TV) to the secondary one (AVR). If I extend, I get 1440p@120Hz, but no high definition audio formats support. If I clone, I get support to all audio formats, but only 1080p@120Hz.

Is there any way to use CRU to fix that? Here are some screenshots showing what the available settings look like:

I don't see how extending would affect the audio unless the AVR is not set to a resolution that can handle the audio. Try setting the AVR to 1920x1080 @ 120 Hz (or 60 Hz).

Cloning would require both displays to support the same resolutions, but the AVR probably won't have 2560x1440 by default.

[chaython]

Is HDR a specific chip? Is freesync a specific chip?
A monitor has ddc/ci can we force an hdr/freesync profile to a non-hdr/freesync monitor? My monitor has a peak brightness of 350 which is most low end HDR tv/s monitors that call themselves HDR10 bs

[EeK]

(08-22-2019 08:34 PM)ToastyX Wrote:  I don't see how extending would affect the audio unless the AVR is not set to a resolution that can handle the audio. Try setting the AVR to 1920x1080 @ 120 Hz (or 60 Hz).

Cloning would require both displays to support the same resolutions, but the AVR probably won't have 2560x1440 by default.

Thanks for replying, ToastyX.

I don't understand it either, but, as you can see from the screenshots, the AVR loses support for lossless HD audio formats when extending.

For now, I was able to connect the GPU through the AVR using a single HDMI cable (my usual setup for all devices), and add a detailed resolution of 2560 x 1440 with a refresh rate of 120Hz. That "unlocked" a new set of resolutions under "PC" on NVCP, including 1440p@120Hz, with all audio formats supported.

The AVR is clearly missing that specific resolution, which is weird, considering that the X4200W (an older model) has it by default (one person confirmed that he had access to non-standard resolutions on NVCP straight away, without the need for an EDID override).

Would you say that's an acceptable solution? Or should I try running two HDMI cables from the GPU once again? I'll probably end up purchasing a DisplayPort 1.4 to HDMI 2.1 adapter when they become available, and then I'd have to connect the GPU directly to the TV no matter what.

P.S.: Apparently, the Denon's "native resolution" is 480p, even if it supports 4K.

[ToastyX]

(08-23-2019 06:14 AM)EeK Wrote:  Would you say that's an acceptable solution? Or should I try running two HDMI cables from the GPU once again?

I would prefer the single cable solution.

[ToastyX]

(08-22-2019 11:34 PM)chaython Wrote:  Is HDR a specific chip? Is freesync a specific chip?
A monitor has ddc/ci can we force an hdr/freesync profile to a non-hdr/freesync monitor? My monitor has a peak brightness of 350 which is most low end HDR tv/s monitors that call themselves HDR10 bs

HDR and FreeSync are standards that the monitor must implement.

[EeK]

(08-23-2019 08:03 PM)ToastyX Wrote:  I would prefer the single cable solution.

Does the native resolution identified by the drivers cause any impact on usability, even if it's not selected?

With the Denon AVR as the display, the native res is 480p (720 x 480). On the "Adjust desktop size and position screen", the preview image is clearly stretched vertically. Not sure if that would cause issues with games or not.

My other concern is related to the future DP 1.4 to HDMI 2.1 adapter that I mentioned. Since there's no eARC on the GPU, I'd still be forced to use a separate HDMI cable for audio, so I'm already thinking of a possible workaround.

Do you know how to edit the TV's EDID to include the missing audio formats? I've never done that. I'm only familiar with adding or removing resolutions.

[ToastyX]

(08-24-2019 03:27 AM)EeK Wrote:  Does the native resolution identified by the drivers cause any impact on usability, even if it's not selected?

The native resolution affects how non-native resolutions are scaled, but that wouldn't be an issue for the AVR since there is no display, and you can change the native resolution with CRU anyway. Just make sure the AVR is set to a resolution with enough blanking to transmit the audio.

(08-24-2019 03:27 AM)EeK Wrote:  Do you know how to edit the TV's EDID to include the missing audio formats? I've never done that. I'm only familiar with adding or removing resolutions.

The audio data block in the CEA-861 extension block lists the supported audio formats.

[EeK]

(08-24-2019 10:05 PM)ToastyX Wrote:  The native resolution affects how non-native resolutions are scaled, but that wouldn't be an issue for the AVR since there is no display, and you can change the native resolution with CRU anyway. Just make sure the AVR is set to a resolution with enough blanking to transmit the audio.

I assumed that would be an issue for DSR, but, weirdly, even without changing the native resolution, DSR still factored its multiples with 4K as the base.

Anyway, there were two identical "default" resolutions of 720 x 480 @ 59.940 Hz listed, with the Denon AVR as the active "display" (GPU connected to it).

I removed one of them and, using the same back porch (60 x 30) and blanking (138 x 45) as the default ones, added two others: 3840 x 2160 @ 60 Hz (first slot on the list) and 2560 x 1440 @ 120 Hz (second slot on the list). One of the original 720p resolutions is now the third slot on the list. Questions:

1. Did I do that correctly?
2. Is changing the native resolution done by simply moving the detailed resolutions up and down on CRU?

Edit: For some reason, whenever I power on my PC or restart it, the color settings default to RGB 8-bits, and I have to change them every time to 422 12-bits. So:

3. Any idea why?

Also, I tried to add a fourth detailed resolution (to the only remaining slot), but that caused issues with audio. It only resumed playing once I cleared the fourth slot, no matter what resolution it included.

4. Even if there are four slots, I have to leave one "open"?

(08-24-2019 03:27 AM)EeK Wrote:  The audio data block in the CEA-861 extension block lists the supported audio formats.

Right!

5. Do I just copy the info presented there when the Denon AVR is the active "display" and add it to the same extension block after the LG TV becomes the active display?

I really appreciate your help.

[ToastyX]

(08-25-2019 06:47 AM)EeK Wrote:  I removed one of them and, using the same back porch (60 x 30) and blanking (138 x 45) as the default ones, added two others: 3840 x 2160 @ 60 Hz (first slot on the list) and 2560 x 1440 @ 120 Hz (second slot on the list). One of the original 720p resolutions is now the third slot on the list. Questions:

1. Did I do that correctly?

I would just use "LCD standard" for TV resolutions like 3840x2160. For 2560x1440, use whatever timing parameters the TV defined. 2560x1440 is not a TV resolution, so the standard timing parameters might not provide enough blanking for all audio formats.

(08-25-2019 06:47 AM)EeK Wrote:  2. Is changing the native resolution done by simply moving the detailed resolutions up and down on CRU?

The first detailed resolution is the native resolution.

(08-25-2019 06:47 AM)EeK Wrote:  Edit: For some reason, whenever I power on my PC or restart it, the color settings default to RGB 8-bits, and I have to change them every time to 422 12-bits. So:

3. Any idea why?

That would have to be an NVIDIA driver bug.

(08-25-2019 06:47 AM)EeK Wrote:  Also, I tried to add a fourth detailed resolution (to the only remaining slot), but that caused issues with audio. It only resumed playing once I cleared the fourth slot, no matter what resolution it included.

4. Even if there are four slots, I have to leave one "open"?

What's in the fourth slot? Is it the monitor name? I remember NVIDIA's driver had a bug that broke the audio if the monitor name wasn't included. That's not a problem with AMD.

(08-24-2019 03:27 AM)EeK Wrote:  5. Do I just copy the info presented there when the Denon AVR is the active "display" and add it to the same extension block after the LG TV becomes the active display?

Yes, you can do that.

[EeK]

(08-26-2019 02:05 PM)ToastyX Wrote:  I would just use "LCD standard" for TV resolutions like 3840x2160. For 2560x1440, use whatever timing parameters the TV defined. 2560x1440 is not a TV resolution, so the standard timing parameters might not provide enough blanking for all audio formats.

When I first added 3840x2160 as a detailed resolution, in order to make it the Denon AVR's native resolution, I ended up with two similar resolutions on NVCP: "4k x 2k, 3840 x 2160" under "Ultra HD, HD, SD"; and "3840 x 2160" under "PC".

Now that I edited the timing of that detailed resolution, changing it from "Manual" to "LCD standard", as you instructed, the "3840 x 2160" resolution under "PC" disappeared. Is that the intended behavior?

Also, how do I find out the timing parameters that the TV defines for non-TV resolutions, like 3200x1800 (60Hz) and 2560x1440 (120Hz) - the two extra resolutions that I want to add?

(08-26-2019 02:05 PM)ToastyX Wrote:  The first detailed resolution is the native resolution.

Got it!

(08-26-2019 02:05 PM)ToastyX Wrote:  That would have to be an NVIDIA driver bug.

Weirdly, it only started after including the extra detailed resolutions via CRU. I'll update my drivers tomorrow, and will let you know if it keeps happening.

(08-26-2019 02:05 PM)ToastyX Wrote:  What's in the fourth slot? Is it the monitor name? I remember NVIDIA's driver had a bug that broke the audio if the monitor name wasn't included. That's not a problem with AMD.

It is, indeed, the monitor name - or, rather, the AVR's ("Name: DENON-AVRHD"). That explains it, then. Can't have more than three detailed resolutions on Nvidia, even if there are, technically, four slots.

(08-26-2019 02:05 PM)ToastyX Wrote:  Yes, you can do that.

Great!

Thank you, as always, for the help, @ToastyX.