Custom Resolution Utility (CRU)

[ToastyX]

(03-25-2023 02:29 PM)AntiGod Wrote:  Hello, thank you very much for this utility. I have been using for several years and for me it is essential software. (There should be a hall of fame for such things).

Anyway I am sure I'm just looking in the wrong place, but I'm still confused about what some of the HDMI 2.x Support settings do.

I am using an LG C1 OLED as a display with nvidia 3080 gpu. I attached my current settings. I have Max FRL at 48 Gbps and TMDS rate set to 660 and I know what these do. I have deep color up to 48-bit enabled and understand these. I know what DSC is but don't use it.

Most of the other ones I'm clueless: Fast Vactive and ALLM and FAPA start are enabled but I'm unsure if they should be. M delta, Cinema VRR, and Negative M VRR are all disabled. I'm curious in particular what these last three do and if they might be useful for me?

I don't have the HDMI 2.1 specification, and there isn't much info about this online, so I'm not sure what everything means.

Fast Vactive means the TV is capable of using a higher pixel frequency to complete the refresh scanout faster. I don't think this applies to VRR because VRR already does this inherently.

Auto Low-Latency Mode means the TV is capable of automatically switching to a low-latency mode when requested. I don't know if Windows drivers use this feature. This is probably something game consoles use.

FAPA start location has something to do with the frame accurate packet area.

Cinema VRR means the TV is capable of handling film refresh rates outside of the VRR range.

M delta and Negative M VRR have something to do with VRR calculations.