Custom Resolution Utility (CRU)

[ToastyX]

(02-08-2025 02:06 PM)bobithtidus Wrote:  lg 39gs95qe owner here, been using the CRU and just noticed some odd behavior with the monitor and custom resolutions settings. So I am using the hdmi 2.1 AV connection, able to get 240 hz on 3440x1440 resolution by creating a new DisplayID 1.3 under Extension blocks. Been running with that for awhile including modifying the HDR metadata, but recently I tried out the resolutions that is found in detailed resolutions even made a few custom ones there and found out the image quality is so much better than the extension block DisplayID resolution, so the no brainer is that I should be using Detailed Resolution or the ones from CTA-861 because it gives better image quality in HDR correct? The problem here is that when I tried to modify the hz, it limits my pixel clock to about 655 mhz which means about 122 hz max, whereas in the DisplayID resolution there seems to be no limitations, so what is the deal here? Is this by design because of monitor limitations, if not is there a way that I can bring the picture quality in the DisplayID extension block resolution to be on par with the detailed resolution that is limited by the 655 mhz pixel clock?

Why do you need to add 3440x1440 @ 240 Hz? That's the native resolution of the monitor according to the specs, so it should already be defined by the monitor. What do you mean by image quality? There should be no difference in image quality between DisplayID and EDID detailed resolutions. You are assuming something and coming to the wrong conclusion.

(02-08-2025 02:06 PM)bobithtidus Wrote:  Also under the display drop down box I found a new version, I am currently using GSM780A which is the active profile, but there appears a GSM780B which is a new profile, that may have appeared when I updated the monitor firmware, not sure, but when I enter that profile it showed a new setting under the Detailed resolution section that is greyed out which is - Range limits: 48-240 Hz, 400-400 KHz, 1400 MHZ.
The problem here is that i don't know how to make that profile active, i selected it in the drop down box and use restart64.exe and all it did was revert back to the GSM780A profile, how do I make the GSM780B my active profile?

You don't make a profile active. Active means it's connected, so whatever that is, it's not connected. Maybe that was for DisplayPort if you tried that at some point.

[ToastyX]

(02-07-2025 10:29 PM)ArtMov Wrote:  I understand, I just see a real difference in responsiveness between hdmi 2.1 and dp 1.4 on my monitor, this is not a placebo, mb allm and qft give this difference? I understand dp 1.4 does not have such functions?
Also, vrr works noticeably better compared to adaptive sync, input feels more responsive, that's for sure, although vrr and adaptive sync do give a delay.

There shouldn't be a difference.

ALLM is a signal to the display to switch to a lower latency mode, such as telling a TV to switch to game mode. ALLM is pointless if the display doesn't lag. If it's a gaming monitor, it shouldn't have any lag at the native resolution with VRR or adaptive sync. That's more of a TV issue.

QFT does not necessarily reduce lag. It would make the scanout faster, but it can also delay the scanout, so there is no benefit unless the frame is forced to render later in the refresh cycle somehow, but the difference would be miniscule at 240 Hz. VRR and adaptive sync already work like QFT for lower frame rates because the pixel clock is fixed and the scanout is delayed until the next frame is ready, so adding more blanking wouldn't be helpful. Also I don't think fast Vactive is even implemented with PC drivers.

[ToastyX]

(02-07-2025 07:00 PM)LGW2363DUser Wrote:  Hello! I would very much appreciate if you please can help me with a hardware update
Im now playing with AMD (760M) and i cant make it work with the same cable and options. Any ideas? Thanks in advance!

The driver might not allow HDMI if the original EDID doesn't have it. If the computer has DisplayPort or USB-C video output, you should get a proper DisplayPort/USB-C to dual-link DVI adapter, but those cost around $50. If you only have HDMI, then you'll need an HDMI EDID emulator to make the driver think you have an HDMI display, which can be found under $10. Then you can use CRU to add the refresh rates you need. Another possibility is if you can figure out how to get into the service menu to enable burn-in mode, you might be able to write the EDID you want directly to the monitor using EDWriter: https://www.monitortests.com/forum/Threa...yID-Writer

[bobithtidus]

(02-08-2025 04:37 PM)ToastyX Wrote:  

(02-08-2025 02:06 PM)bobithtidus Wrote:  lg 39gs95qe owner here, been using the CRU and just noticed some odd behavior with the monitor and custom resolutions settings. So I am using the hdmi 2.1 AV connection, able to get 240 hz on 3440x1440 resolution by creating a new DisplayID 1.3 under Extension blocks. Been running with that for awhile including modifying the HDR metadata, but recently I tried out the resolutions that is found in detailed resolutions even made a few custom ones there and found out the image quality is so much better than the extension block DisplayID resolution, so the no brainer is that I should be using Detailed Resolution or the ones from CTA-861 because it gives better image quality in HDR correct? The problem here is that when I tried to modify the hz, it limits my pixel clock to about 655 mhz which means about 122 hz max, whereas in the DisplayID resolution there seems to be no limitations, so what is the deal here? Is this by design because of monitor limitations, if not is there a way that I can bring the picture quality in the DisplayID extension block resolution to be on par with the detailed resolution that is limited by the 655 mhz pixel clock?

Why do you need to add 3440x1440 @ 240 Hz? That's the native resolution of the monitor according to the specs, so it should already be defined by the monitor. What do you mean by image quality? There should be no difference in image quality between DisplayID and EDID detailed resolutions. You are assuming something and coming to the wrong conclusion.

(02-08-2025 02:06 PM)bobithtidus Wrote:  Also under the display drop down box I found a new version, I am currently using GSM780A which is the active profile, but there appears a GSM780B which is a new profile, that may have appeared when I updated the monitor firmware, not sure, but when I enter that profile it showed a new setting under the Detailed resolution section that is greyed out which is - Range limits: 48-240 Hz, 400-400 KHz, 1400 MHZ.
The problem here is that i don't know how to make that profile active, i selected it in the drop down box and use restart64.exe and all it did was revert back to the GSM780A profile, how do I make the GSM780B my active profile?

You don't make a profile active. Active means it's connected, so whatever that is, it's not connected. Maybe that was for DisplayPort if you tried that at some point.

For DSR, and not using the monitor's DSC, I can tell the quality difference between DSC on and off, and the only way to turn off DSC is using 2.1 AV, and I think 240 hz. The reason why i created a custom resolution is to take advantage of DSR and turn off DSC. As for second profile I might try with 1.4 to see what is the deal with that. Also there is certainly difference in HDR, which is the mode I am primarily using, the HDR seems to tone map differently, which is why I am wondering the monitor is doing something cheap like using internal adjustment to downgrade certain things to be able to do 240hz, just like how DSC is a visual downgrade over the full bandwidth.

Edit: So I tried with 1.4 dp, and the same thing showed up the profile drop down box always default to GSM780A and I have not way of activating GSM780B which is the newer version.

[ToastyX]

(02-08-2025 06:52 PM)bobithtidus Wrote:  For DSR, and not using the monitor's DSC, I can tell the quality difference between DSC on and off, and the only way to turn off DSC is using 2.1 AV, and I think 240 hz. The reason why i created a custom resolution is to take advantage of DSR and turn off DSC. As for second profile I might try with 1.4 to see what is the deal with that. Also there is certainly difference in HDR, which is the mode I am primarily using, the HDR seems to tone map differently, which is why I am wondering the monitor is doing something cheap like using internal adjustment to downgrade certain things to be able to do 240hz, just like how DSC is a visual downgrade over the full bandwidth.

Edit: So I tried with 1.4 dp, and the same thing showed up the profile drop down box always default to GSM780A and I have not way of activating GSM780B which is the newer version.

CRU normally doesn't include the range limits unless it's DisplayPort with adaptive sync. GSM780B doesn't mean newer. It's just a device ID. Maybe GSM780B is with DSC enabled/disabled, or they could have changed the ID in the firmware update.

If you're seeing a quality difference, either the output color depth and format are not the same, or the monitor is doing something differently without DSC. 3440x1440 @ 240 Hz won't be possible with DisplayPort without DSC. With HDMI 2.1, it should be possible without DSC up to 10 bpc if the FRL rate is 48 Gbps. If it's only 40 Gbps, you won't be able to get 10 bpc, which is needed for HDR, so that could cause a difference if you're only getting 8 bpc.

[bobithtidus]

(02-08-2025 07:41 PM)ToastyX Wrote:  

(02-08-2025 06:52 PM)bobithtidus Wrote:  For DSR, and not using the monitor's DSC, I can tell the quality difference between DSC on and off, and the only way to turn off DSC is using 2.1 AV, and I think 240 hz. The reason why i created a custom resolution is to take advantage of DSR and turn off DSC. As for second profile I might try with 1.4 to see what is the deal with that. Also there is certainly difference in HDR, which is the mode I am primarily using, the HDR seems to tone map differently, which is why I am wondering the monitor is doing something cheap like using internal adjustment to downgrade certain things to be able to do 240hz, just like how DSC is a visual downgrade over the full bandwidth.

Edit: So I tried with 1.4 dp, and the same thing showed up the profile drop down box always default to GSM780A and I have not way of activating GSM780B which is the newer version.

CRU normally doesn't include the range limits unless it's DisplayPort with adaptive sync. GSM780B doesn't mean newer. It's just a device ID. Maybe GSM780B is with DSC enabled/disabled, or they could have changed the ID in the firmware update.

If you're seeing a quality difference, either the output color depth and format are not the same, or the monitor is doing something differently without DSC. 3440x1440 @ 240 Hz won't be possible with DisplayPort without DSC. With HDMI 2.1, it should be possible without DSC up to 10 bpc if the FRL rate is 48 Gbps. If it's only 40 Gbps, you won't be able to get 10 bpc, which is needed for HDR, so that could cause a difference if you're only getting 8 bpc.

Yea did some further testing with 1.4 dsc, indeed the B version became active, but the image quality is ass, even with lower HZ and worst part changing the HDR static metadata did nothing, just clipping past 600 nits, so switched back to 2.1 AV and turn off all the DSC option in HDMI 2.1, now image quality look much better, but weird part is it gets even better at below 120 Hz, now the HDR just look right, seems to be monitor limitations, sacrificing something if you want to go above the 655 MHz limit, kind of suck but I actually prefer to play on 100 Hz then 240 hz with gimped details. Anyhow using full bandwith over DSC always look better, might be a small or no difference to some on that lossless thing, but a big difference to me, thanks for your input.

[Dripman]

(02-07-2025 03:04 PM)ToastyX Wrote:  I can't see the link.

1 This: https://www.ozon.ru/product/kabel-dlya-i...675485929/
2 Or this: https://www.wildberries.ru/catalog/24899...etail.aspx
3 Or this: https://aliexpress.ru/item/1005007031924092.html
4 Or this: https://aliexpress.ru/item/1005008202202993.html
5 Or this: https://aliexpress.ru/item/1005008103810700.html

[riwi]

(02-07-2025 03:04 PM)ToastyX Wrote:  

(02-05-2025 11:27 PM)riwi Wrote:  Ola, with CRU I got 4k144hz working via my AVR using DSC. But as soon as I change to 10bit on NVCP I get a black screen. Could you help me figure out what is missing in my settings so I can get 10bit to work?

There's nothing missing.

I meant that I maybe forgot something or that I am doing something wrong.

Could you please clearify? I thought that if a resolution can be chosen than I would be able to make use of it.

[ToastyX]

(02-09-2025 01:48 PM)riwi Wrote:  I meant that I maybe forgot something or that I am doing something wrong.

Could you please clearify? I thought that if a resolution can be chosen than I would be able to make use of it.

There is nothing missing for 10 bpc to work.

[ToastyX]

(02-09-2025 12:42 PM)Dripman Wrote:  1 This: https://www.ozon.ru/product/kabel-dlya-i...675485929/
2 Or this: https://www.wildberries.ru/catalog/24899...etail.aspx
3 Or this: https://aliexpress.ru/item/1005007031924092.html
4 Or this: https://aliexpress.ru/item/1005008202202993.html
5 Or this: https://aliexpress.ru/item/1005008103810700.html

You need to choose one that has a resolution that your monitor can display. Your monitor is not going to accept 4K. It needs to be 1680x1050 or less. #4 gives you an option to customize the resolution. Tell them you need 1680x1050 @ 60 Hz. Then it should work without needing to use CRU.