samsung lu28h750uquxen G-Sync/Freesync issues

northun_munky · 19 Feb 2019 at 09:07

Hi All, I recently bought a samsung lu28h750uquxen and so far, I'm loving it!

However, I have a problem with Freesync running either in standard or ultimate mode in Fullscreen gaming on BFV. I know there are issues with Freesync on non certified G-Sync monitors but every so often when I boot up BF5, it just runs perfectly.

Most of the time, with Freesync set to either standard or Ultimate, I either get a stuttering unpayable mess (and before anyone says 'that's just BFV!!' I know it isn't the game

or if I use ultimate, I get the signal dropping out to blackscreen every second or so.

With Freesync set to off on the monitor itself, the issues go away, but I get tearing

Weirdly, in Borderless it seems to work fine, but I understand that I am losing FPS that way.

I'm using a 1070 so the Framerate is either 60fps (lowish settings

) or drops down to 45+ and when it works, which isn't very often, it looks amazing. Every bit the experience I was hoping for from Freesync.

From LOTS of googlefu, it would appear that the usual freesync issues, flashing etc aren't what I am getting. Is it likely to be a fault with the monitor itself?

I messaged the firm where I bought it (sadly not OcUK) and they said that they would offer me a refund, no quibbles, but if this is a known issue by you knowledgeable people on the forum, changing monitors won't help I guess.

I have tested all the other parts of my system as recently upgraded CPU mobo etc so confident its either a known issue with running g sync on a freesync monitor, or an issue with the monitor itself. Advice much, much appreciated

Spec if you need it:
1600 at stock
Asus Strix 1070 OC
16gb 3000
SSD for boot and games

northun_munky · 19 Feb 2019 at 10:20

Had a chance to test it in a couple of other games now. Freesync works fine fullscreen on Batman Arkham Knight and doom, but has the same issues on BF1... Issue is game related maybe? Will try some more games later today but be interested to hear what you all think

northun_munky · 19 Feb 2019 at 21:09

Undesirable said:
If it's working borderless, I would stick with that mode unless the frame rate is noticeably terrible, which I doubt. It's my preferred mode for the quick alt tab.

Yeah, resigned myself to the fact that I might well have to, but then it started doing the same this afternoon in borderless. Switching between fullscreen and back to borderless stopped it but its certainly not right.

northun_munky · 19 Feb 2019 at 21:57

A good idea mate, I'll give it a go tomorrow. It wasn't that long ago I did that though, however it was before I bought the monitor and BFV so defo worth a go. I'm tempted to just return it, get another identical one just to either confirm or rule out the hardware....

northun_munky · 20 Feb 2019 at 13:12

Vexr said:
I'm doing something similar with a different Samsung monitor (C34J791). Certain reviews of that monitor say it has flawless GSync compatibility and even been bold enough to recommended it as ideal for NVidia FreeSync, yet it's flickering badly on my 1070 Ti with ultimate engine no matter what the game or fps. Sounds rather different to what's happening with yours though; I don't get black screens or anything like that.

I'm getting it exchanged anyway so will keep my fingers crossed. I suppose I may as well try DDU as well for the sake of being thorough.

Pain in the A$$ isn't it

If it was just flickering, it would be better as that's a know issue but this is a whole lot worse sadly. The Blanking every second or more is awful as you can't do anything and the stuttering is like playing with a FPS of 10... with added artifacts. It's weird though as the FPS counter and Frametime counter on Afterburner doesn't budge.

Have actioned a return and bought another from them so we'll see if it happens with the new one. Good luck with sorting yours!!

northun_munky · 20 Feb 2019 at 14:23

Vexr said:
Yeah, I'm gutted TBH, but there's still hope with a replacement.

My 1 day old monitor is going downhill fast in the meantime. Enabling FreeSync is now dramatically reducing the brightness even with GSync disabled in the NV control panel.

I think I'm also starting to get an idea of why it's flickering - just standing in Tomb Raider/GTA V at a solid 85 fps or so, the OSD is showing the monitor fluctuating from about 57 hz to 100 hz lol. A DDU has had no effect.

Maybe this monitor has genuinely faulty FreeSync rather than being an NVidia compatibility issue as this behaviour is bizarre - I guess I'm not going to find out without an AMD card.

Ha! Wouldn't it be nice if things just worked!!

northun_munky · 20 Feb 2019 at 14:59

Davanius said:
My Samsung 27CHG70 drove me nuts when using Freesync. G-sync worked the same so no fault with it but the monitor itself had problems with the mode.

Flickering, stuttering and ghosting issues at lower fps so I returned it for a full refund after 7 months.

I have a 24CFG73 that works fine but the Freesync range starts from 70 Hz.

Yeah, I'm getting the feeling theres a bit of a lottery as to which monitors work well, if at all. For a laugh I rang Samsung support about it. The chap told me my graphics cards wasn't compatible with Freesync which is why it wasn't working. He may be right as I'm using a 1070 but at the point he told me that, he hadn't asked what I was using!

he also couldn't tell me the freesync range of it, seems a bit odd as it isn't listed anywhere I can find.

Oh well, we shall see what the replacement brings.

northun_munky · 20 Feb 2019 at 15:00

Ran the DDU and reinstalled the drivers. Haven't got time to test it today as work but fingers crossed......

northun_munky · 22 Feb 2019 at 07:34

Well, monitor arrived yesterday afternoon so didn't get a chance to text it yesterday but hoping for good things

Cant fault the next day free delivery! Ain't started well though as the bezel has a crack all the way through it.... I'll test it anyway and see

northun_munky · 22 Feb 2019 at 17:44

Well, actually it's been pretty good. None of the major issue which was the constant screen blanking and most of the time it works flawlessly. Occasionally I still get stuttering but I've found that by changing from fullscreen to borderless and back again straight away cures that. Also get a weird frame rate drop at the start of games occasionally, also solved by switching and back again.

I think I had 2 separate issues. One was the faulty monitor itself which the replacement has cured, and the others which I think are inherent to the early drivers perhaps which allow freesync on nvidia cards. I checked out the other thread on gsync freesync and some people were having slightly similar issues. I'd imagine that when mvidia catch up at driver level all will be rosie.

For me, I can live with having to switch from fullscreen to borderless and back as when it works, freesync is awesome. And i can live with the crack if i get a further 25% off

northun_munky · 24 Feb 2019 at 09:34

Yeah Man, really encouraging. This is my first dip into Freesync and have to say it's a game changer when it works. I think as the drivers mature from Nvidia the issues may go away, if not, as I say I can live with the minor ones I've got now. The crack isn't great to be honest, if they accept my proposed discount then I can live with it as I'd have got it for well under market value. We shall see. If not, back it goes and i'll have to look elsewhere. Its a hell of a monitor though when it works.

One annoying thing is that I think the freesync range on my monitor is larger if used of HDMI2, which isn't supported by Nvidia yet. Maybe one day. I say I think as I cannot for the love of god find out the actual freesync range. Even Samsung customer support couldn't tell me. Such is the way

Good luck with yours mate, fingers crossed for you.

northun_munky · 28 Feb 2019 at 17:16

Vexr said:
I got my exchanged monitor today! It's certainly an improvement, though I think I'm possibly-maybe getting some subtle flickering. GTA V in borderless windowed flickers like crazy with the refresh rate all over the place just like the last monitor, but on full screen it seems to work. The other games I've tried (which isn't many) seem okay on borderless or full screen, though I could almost swear there's some extremely subtle flickering. I'd say this could just be my imagination, except there have been certain moments where flickering becomes evident. I tried it in Deus Ex GMDX and there was flickering around the 70 fps range, though as it's an ancient game engine not sure how much I should read into that.

There's certainly a transition flicker when crossing over the 48 fps line (low frame rate compensation kicks in below 48 hz on this monitor), yet LFC does work okay. Otherwise, running around at 50-59 fps is admittedly smoother than the equivalent 50 fps when vsynced on a 60 hz screen. The GSync pendulum demo works fine (except for the 48 hz transitions), which is still a huge improvement over the monitor I returned which flickered non-stop.

It's early days for me and I think I have 'flicker paranoia / hyper vigilance' which is making me cautious about feeling too relieved right now I also haven't tried any tricks like switching modes or turning the monitor on/off, etc.

BTW, there's a U28750, which I believe is the same monitor as yours on 'the' spreadsheet: https://docs.google.com/spreadsheet...SRGswWpJzVRuK_4zMvphRbh19k/edit#gid=706438575

Someone has listed the ultimate engine Freesync range there as 40-60 hz.

Hey man, glad to hear a better experience with the replacement!! I know what you mean about paranoia, I've just been waiting for a resurgence of the major issues I had with the first one

Thanks for the heads up on the spreadsheet, I think it probably is the same monitor. I ended up getting a response from Samsung about the range:

Upon checking, the Freesync range on Standard engine is 54-64Hz while for the Ultimate engine, the range may vary depending on your AMD graphic card settings.

Useless really, and I thought BS as why would the range be higher than the rated 60hz ?!? I ended up downloading ToastyX's CRU and that listed the Standard engine as 50-60 and ultimate as 40-60, which is kinda what I expected from experience. And would tally with 'the' sheet

Being someone who's never happy, I'm now thinking maybe I could OC the monitor to increase the FS range, maybe to 65, 70 if I'm lucky. Haven't got the balls to do it though yet