Custom Resolution Utility (CRU)

[ToastyX]

(01-19-2024 12:39 PM)ArtMov Wrote:  Question to dev, perhaps you are aware of whether there are ways to enable microsoft caso (software mux switch) in intel graphics 6-10 gen? This is purely a software lock, they are forcing us to switch to new hardware. I saw on some forum that someone added keys to the registry in the graphics path (0000) and caso seemed to work, I lost this resource. Toasty please pay attention, I’ve been digging into this question for half a year now. This is a huge boost for laptops, and you, as a display guru, probably know something...

If the value is in the graphics driver key, then it's probably something specific to Intel's driver, and I'm not familiar with what registry values they use to control this.

[DragonRulerX]

(01-24-2024 02:36 AM)ToastyX Wrote:  

(01-23-2024 01:44 PM)DragonRulerX Wrote:  Hi

I've been fighting with my new monitors for awhile now and the more I research things the more I'm getting confused. I was told about this CRU tool in the Monitor Enthusiasts Discord. This tool seems very feature rich and possibly able to fix my issue, but a lot of the terminology in the UI is going over my head. I'm hoping someone can help me fix the issue I'm having.

Setup:
I'm running an RTX 4090 FE currently with 3x Cooler Master Tempest GP27U monitors on Win11 Pro.

Problem:
My understanding about how the RTX 4090 FE works is that it basically turns off ports when it detects DSC so it has more processing power to perform DSC. The RTX 4090 FE comes with 3x DP 1.4a + 1x HDMI 2.1a ports. Therefore, if I have 2x monitors claiming they can use DSC then that's technically all 4 ports "in use". This makes the 3rd monitor "inactive" but, still detected by Windows. In order to get the 3rd monitor to work I'd need 2x or 3x of the GP27U's to not use DSC and 1x or 0x of the GP27U's to use DSC. I've read that some monitors have a method to basically turn off DSC by changing their DisplayPort "version" from 1.4 to 1.2 or something, but this kind of configuration option does not appear to exist in the GP27U's OSD menu nor in any Windows settings screen nor the NVIDIA Control Panel screen from what I can tell. I've even tried buying different DisplayPort "version" cables before I learned that DisplayPort "versions" are kind of misleading and not intended to be used to identify capabilities of cables/ports etc as per the DisplayPort wiki (which is a totally separate thing breaking my brain).

What I've done:
In my ignorance I've contacted NVIDIA who claim they aren't responsible for providing an option to control DSC, apparently, and that Cooler Master would need provide a firmware update to enable this option in the OSD. So, I contacted Cooler Master and frankly they've completely ignored me in all avenues of communication (Discord, Support Tickets, and phone). As a last ditch effort I reached out on the aforementioned Discord server which lead me here. I've tried doing some research on how to use CRU, but I'm pretty lost because I've not kept up on the monitor market in a long time.

I understand some of the nuance surrounding DSC's automatic behavior enough to at least mildly understand why there isn't just an explicit option in CRU labeled "DSC: On/Off", but since I don't understand the rest of the settings by their given names too well I'm incapable of easily figuring out what settings need to change to get this configuration to work. Sadly, I have until the end of this month to get this figured out basically due when I bought these monitors and if I'm going to need to return the monitors or not.

Goal:
Max out the specs of one monitor (4K @ 160Hz w/HDR etc) and have 2x 4K @ 60Hz monitors.

Any help would be super appreciated!

DSC should only be active for resolutions that require it, so if you set the other two monitors to 3840x2160 @ 60 Hz, then DSC shouldn't be active on those monitors.

I did try that before posting here, but it didn't work. The GP27U is very strange when you look at its history and current feature set. It really doesn't like to play nice with multiple monitors. Unfortunately, I haven't been able to contact the vendor so any specific questions I have such as the one I'm posing here can only be answered by what is in the manual - which isn't very comprehensive.

A really interesting and strange behavior is how the inactive monitor loses its settings randomly sometimes too. I can make edits in the NVIDIA Control Panel to a given monitor, change the set of 2 currently active monitors to a different pair and make changes there, followed by returning to the original pair and find my settings reverted back to factory on the monitor that was deactivated during the transition over to the other set of 2 monitors.

Ex: (A->A*, B, !C), (!A, B, C->C*), (A, B, !C) instead of (A*, B, !C)

The experience with the monitor has actually been very frustrating regarding configuration. I'll keep it for awhile longer while I wait for a new purchase of other undecided brand monitors to arrive so I still want to try to find a fix to this to post somewhere for posterity, but I have actually found monitors that explicitly declare in their manuals DisplayPort "version" / DSC On/Off controls so I'm intending to purchase a set of them after I get the response from one last vendor who didn't list these controls in their manual to make my final decision.

[ToastyX]

(01-24-2024 06:52 AM)DragonRulerX Wrote:  I did try that before posting here, but it didn't work. The GP27U is very strange when you look at its history and current feature set. It really doesn't like to play nice with multiple monitors. Unfortunately, I haven't been able to contact the vendor so any specific questions I have such as the one I'm posing here can only be answered by what is in the manual - which isn't very comprehensive.

A really interesting and strange behavior is how the inactive monitor loses its settings randomly sometimes too. I can make edits in the NVIDIA Control Panel to a given monitor, change the set of 2 currently active monitors to a different pair and make changes there, followed by returning to the original pair and find my settings reverted back to factory on the monitor that was deactivated during the transition over to the other set of 2 monitors.

Ex: (A->A*, B, !C), (!A, B, C->C*), (A, B, !C) instead of (A*, B, !C)

Those are NVIDIA driver issues. The monitor can't control what happens when other monitors are present. NVIDIA also has issues with EDID overrides on certain monitors with their newer GPUs. If CRU can read the extension block list (doesn't say "Default extension block"), then you can try deleting all the higher refresh rates to prevent DSC from activating. If not, you can try using DisplayPort to HDMI 2.0 active adapters for the two monitors, since those don't support DSC and will be limited to 3840x2160 @ 60 Hz.

[someone]

(01-23-2024 05:51 PM)alessandro Wrote:  Hi dev! Amazing that you're still supporting this!

I was trying to upscale my T470 thinkpade which has a native 1366x768 to a 1920x1080, merely because I find the size of everything in the native res really big.

I tried to use the standard 1920x1080 res and restart but everytime an Igfxem module notification popped up and ovveride the resolution.

Thanks a lot in advance <3

You can only increase the maximum height to 864 but you need to create/modify a registry value called Display1_DownScalingSupported in the gpu's path (HKLM/System/CurrentControlSet/Control/Class/{4d36e968-e325-11ce-bfc1-08002be10318}/0000). You have to set it to 1 and restart the graphics driver. Because you can't use CRU for downscaling, 1366x864 is the maximum possible resolution you can use. According to Reddit, you can only decrease the titlebar size via the registry.

[emusnoc]

I'm trying to remove the dolby vision block on the alienware aw3225qf using cru. Driver version is 551.23. I'm able to delete it but dolby vision still activates on the monitor. Any idea why? In driver version 546.17, the dolby vision block is not there and it does not activate on the monitor, so shouldn't this method of deleting the block with cru produce the same results?

[SyphonFilter]

Hello, I have set my C9 to 790 nits via CRU/Windows HDR calibration tool and everything works fine. Though now I just got an 8K AVR and going through that instead of directly to the C9 and I cannot seem to calibrate the AVR's nits via CRU. The default values are stuck on 1499 nits and everything is brighter in games but also heavily crushing blacks. And when I go through the Windows HDR calibration tool, I only hit up to 530 nits which is well below what the C9 can do. Any suggestions/ideas? I have tried setting the CRU values for the AVR but nothing changes - also did a restart afterwards.

Side question, I have only used one value of 127 for both Max Luminance and Max Frame-Avg, is that not correct? Should I be using the VESA test app to find the correct Max Frame-Avg?

Thanks, first post!

[SyphonFilter]

Anybody? ^^

[CRTFTW]

So what would be the industry recognized term for what CRU calls "standard resolutions" in the EDID? I'm trying to use the right term for when I submit a bug report to AMD that mine aren't working correctly

Basically, my 6800 XT is having an issue where it uses reduced timings for "standard resolutions", which looks wrong on my CRT.

In the past, on other GPUs, standard resolutions would utilize GTF or CVT standard, as far as I could tell, because they looked correct.

I actually had this issue on my 5700xt but AMD fixed it at some point. But I guess the problem remained on the 6000 series.

[ToastyX]

(02-02-2024 03:05 PM)CRTFTW Wrote:  So what would be the industry recognized term for what CRU calls "standard resolutions" in the EDID? I'm trying to use the right term for when I submit a bug report to AMD that mine aren't working correctly

Basically, my 6800 XT is having an issue where it uses reduced timings for "standard resolutions", which looks wrong on my CRT.

In the past, on other GPUs, standard resolutions would utilize GTF or CVT standard, as far as I could tell, because they looked correct.

I actually had this issue on my 5700xt but AMD fixed it at some point. But I guess the problem remained on the 6000 series.

It's the standard timing block in the EDID. I don't think AMD is expecting anyone to use CRT monitors since they don't have analog outputs anymore. The new CVT standard removed CRT timings completely.

[ToastyX]

(01-30-2024 04:58 PM)SyphonFilter Wrote:  Hello, I have set my C9 to 790 nits via CRU/Windows HDR calibration tool and everything works fine. Though now I just got an 8K AVR and going through that instead of directly to the C9 and I cannot seem to calibrate the AVR's nits via CRU. The default values are stuck on 1499 nits and everything is brighter in games but also heavily crushing blacks. And when I go through the Windows HDR calibration tool, I only hit up to 530 nits which is well below what the C9 can do. Any suggestions/ideas? I have tried setting the CRU values for the AVR but nothing changes - also did a restart afterwards.

Side question, I have only used one value of 127 for both Max Luminance and Max Frame-Avg, is that not correct? Should I be using the VESA test app to find the correct Max Frame-Avg?

Thanks, first post!

What GPU? What driver version? If NVIDIA, make sure there are at least 2 bytes left for data blocks in the CTA-861 extension block. Max luminance and max frame average luminance can be the same.