Hello, i have read the other posts about flicker issues with Q80T-Q90T on 4K 120hz with a RTX 3000 series but in my case when i switch my resolution to PC 3840 x 2160 on the hdmi input 4 that supposedly supports hdmi 2.1 4k 120hz the screen turns completely black with some white lines , when i choose the ultra hd 4k x 2k 60 hz it works normally. My cables are club3d 8k that is certified hdmi 2.1 and the PS5 cable , my TV firmware is 1460.9 and nvidia driver is the 460.89.
It sounds like the fault is your cable, club3d 8k is only rated to support speeds up to 32,4 Gbps.
I know club3d 8k advertised the cable as a hdmi 2.1 compatible. In theory this cable should work but from experience you will lose the signal. My club3d 8k is only stable at 2560x1440@120Hz chroma YCbCr442. You really need a full 48Gbps bandwidth cable to achieve a resolution of 3840x2160@120Hz.
Try SIKAI Optical Fiber 8K 48Gbps-Ethernet hdmi 2.1 cable this is a good alternative. I can run this cable at 4096x2160@120H without signal loss on my Q90R.
I don't think so the club3d cable i have is certified for 4k 120hz from hdmi.org and i also tried with the PS5 cable that is capable for 4k 120hz but neither worked and as i mentioned if it was a cable problem like other people i would see a picture with flickering not compete black screen with white lines.
Exact same problem, backscreen and later no signal on Q80t with RTX 3070 on the 4th HDMI port using a certified HDMI 2.1 cable (verified using HDMI Licensing Administrator app)
No official response from Samsung, LG fixed problems with their HDMI 2.1 long ago.
Everything would have been so much easier if Samsung had made a TV version with a display port and full support for Nvidia G-sync ultimate, like the Nvidia BFGDs concept.
@SamsungAl A premium high end TV with g-sync ultimate and freesync 2 would sell faster than ever.
Exactly this. Enabling VRR on 120hx at 4k appears to introduce handshaking and stability issues between GPU and screen. I have played at 4k120 with VRR for an hour or more and then it will just stop working all of a sudden. It's very finicky and the only real solution so far is to disable VRR for 4k120.
Hopefully there is both and/or Nvidia drivers and Samsung firmware that adresses this.
There are major issues with 1460.9 firmware and RTX 3080 when using port 4 (HDMI 2.1).
I've found people who have the RTX 3080 working with this set, only to find out that they are still on firmware 1403. I know no one on 1460.9 that has a working set.
In my experience, if I use a high quality cable, I get no signal when engaging Input Signal Plus
If I use a lower quality cable, I can get a signal but it blacks out every so often. (Opposite of what you would think).
So, I wouldn't go out and buy any new cables until Samsung has fixed this with a firmware update. I have the Club3D certified cable too.
On a technical note, if I hack the EDID in Windows 10 via CRU, I can get everything to (mostly) work. I have to drop the link bandwidth to 32Gbit and remove all DSC support. Even with this hack, if I change modes to an HDMI 2.0 mode, then I have problems, and engaging GSync can cause similar problems.
Hopefully next week we see an update.
Not sure if this helps, but when I would boot up I would constantly get "No signal" screens while also using an RTX 3080 on HDMI Port 4. While not a full on solution, I would always set the input signal to HDMI 4 > Turn off the TV > Turn on the PC and wait about 10-15 seconds to boot to login page > Turn on the TV > 9 times out of 10 I will get a normal picture on the TV. While not convenient in any way, I found that this has been the best workaround for me to solve "No signal" messages. Maybe try doing this and see if it works for you?
I also do get 4K on HDMI Port 4 at 120hz, games like Cyberpunk 2077 and Metro Exodus look stunning on it with a 3080.