Custom Resolution Utility (CRU)

[aeneas1]

(03-12-2019 08:55 PM)ToastyX Wrote:  

(03-12-2019 05:15 PM)aeneas1 Wrote:  i see how to set up 1920 x 820 / 30hz and 60hz and 3840 x 1634 / 30hz and 60hz, but i don't know how to fill out the rest of the fields, are there default settings for these fields or someplace i can find the info? thanks very much!

Use the "LCD standard" timing option to fill in the values. The values themselves don't matter much as long as they aren't too low. The original purpose was to give the electron gun time to move between lines/frames on a CRT monitor. That's not as important with digital monitors, but most still need some time for processing. Standards exist to make sure certain values always work, but that only applies to resolutions the monitor officially supports. When adding custom resolutions, there's no guarantee the monitor will accept the resolution or any particular timing parameters. If the monitor can't handle those resolutions, you can use GPU scaling. With GPU scaling, the timing parameters don't matter since the GPU will scale the resolutions to the native resolution.

thanks very much!

[Twone]

Hey! Can you tell me what the "SCDC present" feature is under HDMI 2.0 support? I just bought Samsung NU7100 4k TV and connected it with a quality 10m cable to my PC with RX 580. Every time I power on/off the TV my main monitor blinks, sometimes the TV's resolution gets reset to native 4k of what I've set it (1080p), sometimes it takes ages to find the signal and all sorts of weird problems. If I turn this feature off on CRU or delete HDMI 2.0 block all together everything works normally so I'm wondering if it's safe to disable this and what it even is, why is it being enabled on default if it causes these problems.

[Brunchinese]

First of all, thanks for sharing this useful information.
However, I still can not turn on FREE SYNC fution for us non-free sync monitor (MODL: SAMSUNG C27JG5X). Could you tell me in more specific way of turning it on. Thanks.
By the way, my card is RX590

[ToastyX]

(03-20-2019 08:37 AM)Brunchinese Wrote:  However, I still can not turn on FREE SYNC fution for us non-free sync monitor (MODL: SAMSUNG C27JG5X). Could you tell me in more specific way of turning it on.

No, that's not what CRU is for.

[ToastyX]

(03-19-2019 08:33 PM)Twone Wrote:  Hey! Can you tell me what the "SCDC present" feature is under HDMI 2.0 support? I just bought Samsung NU7100 4k TV and connected it with a quality 10m cable to my PC with RX 580. Every time I power on/off the TV my main monitor blinks, sometimes the TV's resolution gets reset to native 4k of what I've set it (1080p), sometimes it takes ages to find the signal and all sorts of weird problems. If I turn this feature off on CRU or delete HDMI 2.0 block all together everything works normally so I'm wondering if it's safe to disable this and what it even is, why is it being enabled on default if it causes these problems.

SCDC is the Status and Control Data Channel. The HDMI 2.0 specification states that SCDC is required to support TMDS character rates greater than 340 Mcsc (same as the pixel clock MHz at 8 bpc), which means it's required to get 3840x2160 @ 60 Hz 4:4:4. Deleting the HDMI 2.0 data block would limit it to HDMI 1.4 speeds, which would also prevent 3840x2160 @ 60 Hz 4:4:4 from working, limiting it to either 30 Hz 4:4:4 or 60 Hz 4:2:0. When you say 10m, do you mean 10 meters? Long cables can cause signal and handshake problems at high data rates.

[Abyha]

Greetings!

Such a problem, there is a laptop HP Omen15 with a built-in video card (Intel UHD 630) and a discrete (GTX 1050Ti).

The integrated graphics card is locked at 40 and 60Hz. When I try to change the Hz from the Intel Control Panel, I get an error - "the user resolution exceeds the bandwidth".

Then i try CRU, leave the resolution at 1920x1080 and set at 75Hz. Nothing changes, 75Hz do not appear in the monitor settings either.

After rebooting the laptop, the screen gives out just a black screen, you have to go into safe mode or connect via HDMI.

On my old laptop Lenovo Y500 with GTX650M, with a damaged matrix cable, I clocked up to 107Hz without problems, after 108 artifacts appeared.

As I understand it, at OMEN is prevented by some kind of blocking from UHD Graphics.

Help me please.

P.S.
(sorry for my eng.)

[Twone]

(03-20-2019 07:06 PM)ToastyX Wrote:  

(03-19-2019 08:33 PM)Twone Wrote:  Hey! Can you tell me what the "SCDC present" feature is under HDMI 2.0 support? I just bought Samsung NU7100 4k TV and connected it with a quality 10m cable to my PC with RX 580. Every time I power on/off the TV my main monitor blinks, sometimes the TV's resolution gets reset to native 4k of what I've set it (1080p), sometimes it takes ages to find the signal and all sorts of weird problems. If I turn this feature off on CRU or delete HDMI 2.0 block all together everything works normally so I'm wondering if it's safe to disable this and what it even is, why is it being enabled on default if it causes these problems.

SCDC is the Status and Control Data Channel. The HDMI 2.0 specification states that SCDC is required to support TMDS character rates greater than 340 Mcsc (same as the pixel clock MHz at 8 bpc), which means it's required to get 3840x2160 @ 60 Hz 4:4:4. Deleting the HDMI 2.0 data block would limit it to HDMI 1.4 speeds, which would also prevent 3840x2160 @ 60 Hz 4:4:4 from working, limiting it to either 30 Hz 4:4:4 or 60 Hz 4:2:0. When you say 10m, do you mean 10 meters? Long cables can cause signal and handshake problems at high data rates.

Yes, I mean 10 meters. I have the same problems with a shorter cable like 1 meter one, my GPU loses the signal to the TV for a couple of seconds whenever I power it off or on which makes my main monitor blink and flicker until the signal gets stable. It's fairly problematic as when SCDC feature is enabled the resolution gets reset to 4k whenever my GPU is trying to get the signal to the TV again, and with the 10m cable it takes a long while, which can make my main monitor flicker for up to a 1 minute. It does this with shorter cables too, even with a 1.4 cable which I've tried, it just finds the signal quicker. However if I disable SCDC present or delete the HDMI 2.0 block and switch to 1920x1080 which I mostly use anyways the signal doesn't get dropped nor the resoluton gets changed, even when I power off the TV so my main monitor doesn't blink or flicker, which is how I want it to be. I was just wondering what causes this behavior, I can't say it's the cable as I've tried multiple. AMD driver issues perhaps?

[ToastyX]

(03-21-2019 04:18 AM)Twone Wrote:  Yes, I mean 10 meters. I have the same problems with a shorter cable like 1 meter one, my GPU loses the signal to the TV for a couple of seconds whenever I power it off or on which makes my main monitor blink and flicker until the signal gets stable. It's fairly problematic as when SCDC feature is enabled the resolution gets reset to 4k whenever my GPU is trying to get the signal to the TV again, and with the 10m cable it takes a long while, which can make my main monitor flicker for up to a 1 minute. It does this with shorter cables too, even with a 1.4 cable which I've tried, it just finds the signal quicker. However if I disable SCDC present or delete the HDMI 2.0 block and switch to 1920x1080 which I mostly use anyways the signal doesn't get dropped nor the resoluton gets changed, even when I power off the TV so my main monitor doesn't blink or flicker, which is how I want it to be. I was just wondering what causes this behavior, I can't say it's the cable as I've tried multiple. AMD driver issues perhaps?

It sounds more like a handshake problem. It's possible SCDC is not present when the TV is turned off, so the video card has to renegotiate the connection. SCDC and HDMI 2.0 are required to support HDMI 2.0 speeds. 1920x1080 doesn't require HDMI 2.0. Does anything change if you disable HDCP support for the TV in Radeon Settings?

[nervous]

Why can't I use 1080 by 1080 I saw on a post on Reddit that I could use it.

[ToastyX]

(03-23-2019 01:13 AM)nervous Wrote:  Why can't I use 1080 by 1080 I saw on a post on Reddit that I could use it.

You can.