Neo G8 4K 240Hz losing connection randomly for 1-2 sec

[Byogore]

Have a problem that kind of makes no sense to me. I swapped from an RTX 4090 Suprim to 5090 FE and now the monitor randomly turns off for 1-2 sec and recovers. Tried 3 different cables (Silkland DP 2.0 and IVANKY) also the default cable. All of these cables worked fine before. I am using the latest firmware.

The monitor wasn't even used at all after I sold the 4090. I just plugged it in after a month. When using GSYNC, this blackscreen never happens. When you turn off GSYNC (aka adaptive-sync on the monitor's settings), you lose connection to the monitor for 1-2 sec whenever it feels like it. Could be 1 minute, 15 minute or 30 minutes. This happens on desktop and in games. Monitor goes black and in the top left you can see the Display Port icon, as if I manually reconnected. Stock 5090 settings. You don't need to use GSYNC in NVIDIA Panel, you just need to have Adaptive-Sync enabled on the monitor (in case you don't want to use GSYNC but want to fix the issue)

I never had these black issues before with adaptive-sync off. Windows is fresh, DDU drivers multiple times, tried the last 4 drivers and it still happens on 572.83. I also tried the 1080p 240Hz BENQ that I have here and it didn't cause any blackscreens (didn't test it much tho) but I am guessing this is a driver issue with DSC and for some reason "Adative-Sync" set to enabled on the monitor the issue go away.

So what do I do now? RMA the monitor or is the GPU broken? It's hard to tell what's happening here. The GPU works fine under any stability test (3DMark etc) with max OC, heavy undervolt and also stock. Tried all ports (except HDMI since I don't have an HDMI cable atm but will soon)

Waiting on a SILKLAND 2.1 DP cable to try that. Edit: didn't do anything (not that I was expecting it to, wanted the cable anyway)

What a frustrating issue. Specs below

CPU: 9800X3D

GPU: RTX 5090 Founders Edition

Motherboard: X870E Nova (3.15 BIOS) and using PCIe x16 5.0 (tried 4.0, still the same thing)

PSU: NZXT C 1500W

Windows 11 latest build.

Edit:

576.02 - no fix.

576.26 Hotfix Driver - no fix.

[Byogore]

New NVIDIA drivers 576.02 with many bug fixes but the issue is still there for me.

[Monitor11]

I think I had the exactly same issue that my G8 blacked out for a couple of seconds then recovered. I just turned off the HDR in Windows setting and did not encounter it for a few hours so far. I will keep checking if this works, as the issue happened pretty randomly, at any time and at any status.

I feel this has nothing to do with the specs, but mines are below: 14900KS, Astral 5090, Z790 Hero, HX1200i, Windows 11 Home.

[Monitor11]

One difference though, I also tried turning off/on G-sync, did not work for me.

[Monitor11]

Update: Still had the issue. 

[Byogore]

Unfortunately HDR does nothing for me, as it was always off anyway. I haven't found any other way of fixing this. As mentioned before, only Gsync (adaptive-sync on the monitor) set to ON works (even if I don't use GSYNC in NVIDIA Control Panel)

Don't know if my monitor is broken or these 5000 series GPUs are just a mess. I am going to run out of the RMA window soon and Samsung haven't bothered to reply once to this thread. At this point I am thinking of doing an RMA on the monitor.

[matthewaasi]

I'm having the exact same issues as you. I went from a Gigabyte 4090 to a 5090 FE, and the DP connection "drops out" and then recovers after a few seconds. At first it happened very infrequently, but I'm at the point where it's happening every 10 minutes or so. Had zero issues with my 4090 and my G8.

I saw your comment about turning Gsync on. I'm going to try that and have my fingers crossed!

[matthewaasi]

Updating this thread to confirm that enabling Gsync worked for me. For those it doesn't work for - make sure you enable VRR in the monitor's OSD. I forgot I had it disabled in there too and was still getting flickering until I fixed that

[Byogore]

Thanks for the update. Yeah, it has to be enabled on the monitor itself. I've not had a single blackscreen with this yet. U can turn off GSYNC in Windows if you don't want it (in NVIDIA control panel)

So seeing as you have the same issue, this clearly tells us it's something to do with drivers / firmware. They need to sort it out but Samsung isn't saying anything. It's their job to talk to NVIDIA. I also tested NVIDIA's latest hotfixes - the issue still exists. Those 2 hotfixes are 576.02 and 576.26

I reported the issue to NVIDIA twice, make sure you all do it so maybe they notice us. This link below is taken from the NVIDIA Discord "nvidia-driver-log" channel.

https://docs.google.com/forms/d/e/1FAIpQLSewHJk1xP-C5elLBRCDLTLpNQZ9eiefrdZmUGP9hMCN6gKssA/viewform

[matthewaasi]

Yeah, I'm also on the hotfix driver from a few days ago and it was still happening. Thanks for linking the Google Doc, filling that out now.

[Byogore]

I just reported the issue to Samsung's live chat as well. Hopefully it gets shared with the correct people needed to resolve this. If the rest if you can be bothered, feel free to share this thread in their live chat so it gets more attention from multiple people.