Background: TV is 75 inch Q800T (EU version), but I assume this will affect all of the 2020 Samsung TVs Software is version 1402.6 (updated Octomber 8th) HDMI Cable 2.1 certified full 48gbps The same HDMI cable works just fine with HDMI 2.0 GPUs like my old GTX 1080Ti (Game Mode works flawlessly there) Current GPU: RTX 3090 with latest Nvidia drivers
What is working as intended when using the HDMI 2.1 port and RTX 3090 as a source:: *Outside of game mode I don't have any problems, I can run at 4k@120hz RGB 10 bit or 8k@60hz 4:2:0 10 bit without any problems.
What does NOT work when using the HDMI 2.1 port and RTX 3090 as a source: * If you turn on Game Mode, the TV picture goes BLACK and it looses signal This happens disregarding on what resolution and refreshrate you are playing, I`ve tried the following: - 1440p@60hz Input Signal Plus ON - 1440p@60hz Input Signal Plus OFF - 1440p@120hz Input Signal Plus ON - 4k@60hz Input Signal Plus ON - 4k@60hz Input Signal Plus OFF - 4k@120hz Input Signal Plus ON
- 8k@60hz Input Signal Plus ON NONE of them was able to switch to Game Mode !!!
However If the RTX 3090 is connected to one of the HDMI 2.0 ports of the TV, Game Mode is perfectly functional, but then you are restricted to 4k60hz and 8k@30hz
finally someone has tested hdmi 2.1! embarrassing results lol
however, gsync hdmi-vrr requires an hdmi 2.1 port, needless to test it on 2.0 ports
Note that I was testing with 1440p and 4k @Anonymous User hz , in all of them the G-sync was not working (was causing huge flickers or just black screen)
My dude......you’re on the old firmware. There’s a new firmware update that addresses this and fixed the game mode dimming bug while making a lot of other improvements. While I thank you for testing this, I’d be curious to see what it’s like on the new firmware that dropped yesterday.
There is a thread at the top of this page with 100k+ views and almost 100 pages of comments about the dimming bug. You’re still on update 1304 which means you don’t have the new firmware and your testing was pointless.
