Elgato 4K Pro 4K120 HDR VRR Passthrough
Question
Am I mistaken in believing that the 4K Pro is supposed to be capable of passing 4K120 HDR VRR to a TV/display?
Problem
Trying to configure a friends capture setup. When I send 4K120 HDR VRR to a 4K Pro / through to his TV, the card's internal HDR tone-mapping doesn't work (washed out), and the signal is washed out on the TV.
- HDR is enabled in Windows, when disabled it looks "fine" but TV is much less bright due to no HDR.
- If I use an HDMI 2.1 splitter to bypass passthrough on the 4K Pro, HDR is sent proper to the TV, but auto tone-mapping still doesn't work on the capture card. I have to manually configure it in OBS to get proper tone-mapping. Additionally VRR doesn't work when using a splitter, it seems the capture needs to be directly connected to the display to read the VRR.
- When outputting 4K60 HDR VRR to the 4K Pro with passthrough to the TV everything works. Auto tone-mapping, and colors look correct on the TV.
Relevant Hardware
- Elgato 4K Pro
- Display - LG OLED-C1
- RTX 4090
- Certified Anker HDMI 2.1 cables on everything
4 Replies
So far the most acceptable configuration is using the splitter.
- Proper HDR on the TV.
- Manual tone-mapping on capture card in OBS, but looks okay.
- Unfortunately no VRR.
But it'd be nice if I could get it all working.
- 4K120 HDR VRR to TV.
- Auto tone-mapping on the capture card.
This is one of those "sounds like a bug, should contact the manufacturer" issues
Because it should support 4120 HDR passthrough, so clearly it not working correctly is a bug
Not sure if you explicitly checked for updates in the Elgato 4K Capture Utility since sometimes it doesn't automatically trigger update checks
Yeah it definitely works in general
Try 4Kcu EDID utility set to display
Yeah first thing I did was update 4Kcu & then update firmware on the 4K Pro via 4Kcu. Powered down the system, flipped the switch on his PSU, and waited 30 seconds before turning it back on.
I set the EDID mode to display after said reboot. The windows source sees the TV's EDID identically whether it's through the capture card or not. So it must be something happening internally with the capture card.
I opened a ticket with Elgato, hope they can help me figure it out.