Monitor Tests Forum

why is 640x480 interlaced 120hz not showing up on windows node list?

Hello, everyone! I would like to know what options should I enable or disable on the HDMI 2.1 specification page?

Specifically I'm interested in Cinema VRR, M Delta, Negative M VRR, Fast Vactive, Auto low-latency mode.

Of all them I only have Auto low-latency mode enabled by default. The only information I could find is related to Fast Vactive, but again does this technology do anything in VRR mode? Is there any specific documentation I could dig into?

I would like to find the best VRR settings for my TV to get the best smoothest picture, but not sure which of those options I should enable.

(05-02-2025 02:07 PM)mikeymouse2024 Wrote: [ -> ]Hello, everyone! I would like to know what options should I enable or disable on the HDMI 2.1 specification page?

Specifically I'm interested in Cinema VRR, M Delta, Negative M VRR, Fast Vactive, Auto low-latency mode.

Of all them I only have Auto low-latency mode enabled by default. The only information I could find is related to Fast Vactive, but again does this technology do anything in VRR mode? Is there any specific documentation I could dig into?

I would like to find the best VRR settings for my TV to get the best smoothest picture, but not sure which of those options I should enable.

You shouldn't change anything. They are there mainly to show what the display supports and to disable if something causes a problem.

Cinema VRR is meant to allow film frame rates outside the VRR range, but HDMI 2.1a deprecated this feature.

M delta means the display "performs best when limits are placed on the rate-of-change of the actual refresh rate when using VRR" according to the HDMI 2.1 standard. Normally this should be disabled for gaming, but some displays might have issues like brightness flickering if the frame rates change too much.

Fast Vactive means the display supports increasing the blanking and pixel clock to transmit frames faster. Normally VRR also increases the blanking until the next frame is ready, but if both VRR and Fast Vactive are enabled, the blanking is already increased, so negative M VRR indicates it can decrease the blanking if the frame is ready sooner.

I don't know if any of these features are implemented by AMD or NVIDIA.

(05-01-2025 06:07 AM)juanme555 Wrote: [ -> ]why is 640x480 interlaced 120hz not showing up on windows node list?

I don't know. The driver seems to be rejecting anything below 384 lines (768i), maybe because historically 1024x768i is the lowest interlaced resolution used with PCs, even though TVs can do 480i and 576i.

(05-02-2025 08:14 PM)ToastyX Wrote: [ -> ]

(05-01-2025 06:07 AM)juanme555 Wrote: [ -> ]why is 640x480 interlaced 120hz not showing up on windows node list?

I don't know. The driver seems to be rejecting anything below 384 lines (768i), maybe because historically 1024x768i is the lowest interlaced resolution used with PCs, even though TVs can do 480i and 576i.

i was able to force 480i by introducing it with the ncp , but just that one resolution, after that, they ALL appear on the node list, including 480i.

well it took a while but after so many years i have finally achieved it, i got my CRT Monitor to display all resolutions for games of all generations properly.

256x240p120hz + black frame insertion on retroarch to achieve 60hz motion clarity for games from NES to PS1

640x480i 120hz sadly without bfi on PCSX2 and Xemu , but the games look amazing.

1280x720p60hz for RPCS3 and Xenia which run AMAZING and look insane.

1280x960i 160hz for 4:3 Esports gaming at high framerate on CS2.

1440x1080i 60hz for 4:3 1080i to feed some modern games UI which will break if fed less than 1080 pixels vertically

1920x1200i 144hz for desktop and half the modern games launched after 2022 which will glitch the hud if fed less than 1920x1080 pixels

1920x1440i 120hz for 1440p 4:3 gaming on games where my 1080Ti and 10900K can actually get that framerate, like Death Stranding and Resident Evil 8.

My mind is blown, everything looks right, everything looks beautiful and im doing it all on the same computer and same display, same windows session, in some cases i dont even need to manually switch the resolutions because for example Retroarch will switch to 240p automatically and go back automatically when i close it.

(05-02-2025 08:13 PM)ToastyX Wrote: [ -> ]

(05-02-2025 02:07 PM)mikeymouse2024 Wrote: [ -> ]Hello, everyone! I would like to know what options should I enable or disable on the HDMI 2.1 specification page?

Specifically I'm interested in Cinema VRR, M Delta, Negative M VRR, Fast Vactive, Auto low-latency mode.

Of all them I only have Auto low-latency mode enabled by default. The only information I could find is related to Fast Vactive, but again does this technology do anything in VRR mode? Is there any specific documentation I could dig into?

I would like to find the best VRR settings for my TV to get the best smoothest picture, but not sure which of those options I should enable.

You shouldn't change anything. They are there mainly to show what the display supports and to disable if something causes a problem.

Cinema VRR is meant to allow film frame rates outside the VRR range, but HDMI 2.1a deprecated this feature.

M delta means the display "performs best when limits are placed on the rate-of-change of the actual refresh rate when using VRR" according to the HDMI 2.1 standard. Normally this should be disabled for gaming, but some displays might have issues like brightness flickering if the frame rates change too much.

Fast Vactive means the display supports increasing the blanking and pixel clock to transmit frames faster. Normally VRR also increases the blanking until the next frame is ready, but if both VRR and Fast Vactive are enabled, the blanking is already increased, so negative M VRR indicates it can decrease the blanking if the frame is ready sooner.

I don't know if any of these features are implemented by AMD or NVIDIA.

Thank you a lot for your explanations! Now I understand that even if my TV supports those features my GPU might not. So as long as generally my TV works well with default settings it's better not to touch them.

I got a TCL 55C845x2 that I use a PC monitor.
Only issue i got is that i get some VRR brightness flicker in some games that indeed drop framerates to sub 60 (55 or so) in some instances , but the flickers don't appear to be tied exactly to those moments (it might or it might not happen during those drops).
are there any settings I can apply with this tool to mitigate this?
Also at times also because of the VRR it seem that a HDMI re-handshake happens. Ultra fast blank out, Sound drops for a second and OSD displays HDR10 and resolution.
I have tried different cables, even one that I know for sure is legit 2.1 ( the one that comes with PS5). same results. this tool would be my my last chance.
I might live without VRR, but ALLM is tied to it and can't be turned on individually.

question regarding hotkey resolution changer, i finally got it to work and i got it to break and i can now pinpoint the issue, but i cant find a solution

I can switch between resolutions of the same scan fine, but i cannot switch between resolutions of different scan.

I run 640x480 interlaced for 6th gen games on PCSX2 Xemu and Dolphin , and i can easily switch with a hotkey between that and 1920x1440i , but i cannot switch from 480i to 1280x720p 60hz , because i can go from interlaced to interlaced resolution or progressive to progressive, but cannot switch from an interlaced resolution to a progressive resolution nor vice-versa , is there a fix im not aware of?

Hello, how do I create an Interlaced 2560x1440 resolution that Windows (Desktop and Games), can detect it?

(05-03-2025 10:36 AM)Merculian Wrote: [ -> ]Hello, how do I create an Interlaced 2560x1440 resolution that Windows (Desktop and Games), can detect it?

if you go into cru, and add a detailed resolution (assuming you are using displayport), you need to select the automatic pc timing preset and check the interlaced box then add the resolution 2560x720 because this way its actually the wanted resolution and type in the refresh rate. be aware that if you go from the max refresh rate you might need to lower the refresh rate until you are at the max acceptable hz! if you got any questions please ask me or the other users!

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hey everyone! i would like to ask about the range limits inside of display properties. its not like i dont know what all of them do, its just that when i set the max limit to the max acceptable range and restart the driver, it doesnt change the limits? i tried to do a 1 hz overclock from 165 hz on my monitor (an acer xv240yp) and it just blacks out then reverts back to 165 hz. is the monitor hard codedly limited? or does it revert the values back? i would like someone to anwser my question, as its really hard for me to understand this issue! thanks!