PG34WCDM with G-sync / White horizontal lines flicker / Oled antiflicker message and black screens

[PWN3D_]

Hi

It's seems that their is a wide spread problem with this monitor when using G-sync. A white horizontal line all across the monitor is flashing when using G-sync in game and when the FPS is fluctuating drastically. Seems like it is mostly visible at the top of the monitor.Happens when the monitor is connected to Display port or HDMI. For my test I used the G-sync Pendulum Demo availaible here while adjusting the fps to 35min-50max.

It seems to be way more noticable when using 10bit color with Nvidia control Panel, but on 8bit, those line I still there but more faint

Here is a video capture of this problem: 

I've tested 3 different unit of this monitor so far and ALL of them had this problem (tested with verision MCM102 out of the box and also updated to the latest available MCM 103). Tested with all the included DP cables AND Hdmi cables. I have also tested a PG27AQDM with the same exact PC (4090 strix with the lastest driver update) and cable and I did not encounter this problem. I've tested all ports from my 4090, we tested an other PC at the shop using the same G Sync pendulum demo, same behaviour.

I've already asked on a previous topic when/if the OLED anti Flicker option that is available for the PG27AQDM will be available for the PG34WCDM/PG39WCDM as it's still suffer from brightness flickering as you can cleary see on my video, but this white line seems like an other problem on it's own to me.

(Is the PG34WCDM will also be updated with the OLED... - Republic of Gamers Forum - 1024183 (asus.com...

Thanks

[PWN3D_]

Just tested the freshly released MCM104 and I'm thankfull that the OLED anti flickering option is here.

With the OLED anti flickering off, the problem still persists, and after some troubleshooting, It seems that those white line occurs because of Low Framerate Compensation.

It seems that when in the first few seconds of launching the Nvidia pendulum demo, LFC doesn't kick right away when the framrate dip to the 35-50 default range as I can see in the FPS counter from the OSD of the monitor matching this fps range.
After a few seconds or when I interact with the mouse by clicking a few time or rotate the camera on the demo, the FPS counter from the OSD of the monitor jump to 70- 100 so basically double the fps that indicate me that LFC is now kicking, and those white lines finally disapeared.

I'm now testing the with monitor with OLED anti flickering turned to medium, and so far, no white lines are present when using this option

So far the OLED anti flickering seems to work arround this issue, but I think that the root of the problem is still to be fixed.

Edit: I just add a black screen and a message from the Oled Anti flicker saying something along the way that "this frame rate is not compatible with the Oled Anti Flicker option" while I was testing the pendulum demo on a 145-160 fps range.
I see that the PG27AQDM MCM107 firmware seems to have "Solved OLED antiflicker message and reset behaviour abnormal", is this the message I'm reffering to? Because I so, think that this behaviour made it's way to MCM104 for the PG34WCDM unfortunatly.

[Aureliannn_ROG]

Hi @PWN3D_ ,

thank you for your feedback regarding the white line issue you were experiencing with your PG27AQDM monitor. 

We are glad to hear that the issue has not reoccurred since the release of firmware MCM104, which introduced the new OLED anti-flicker option.

We would appreciate it if you could continue to monitor the situation and let us know if the white line issue reoccurs. 

If it does, please provide us with a video of the issue occurring. The video will help our team analyze and confirm the problem. (Please provide the video in its original MP4 format.)

Additionally, please confirm that all settings are set to their default values when reporting the issue.

Thank you for your cooperation.

[PWN3D_]

Hi @Aureliannn_ROG 

Sorry for the misundertanding but this issue DOES still occurs even on MCM104. It just doesn't appears with OLED anti flicker turned on due to the fact thatit reduce the G-sync range.

If I restore my monitor to default settings and use g-sync (on by default) I still get those line as soon as I open the demo, or randomly in games.

Edit: This OLED anti flickering is not working correctly, I get a lot of random black screen with the monitor saying that "OLED anti flicker is not available at this framerate" on a 4090. Something is wrong since It never happen on the PG27AQDM. I decided to take back once again the PG34WCDM to the shop, they again tested it and saw those problems right away and proceded to another replacement from asus support. It will take a week for me to have it back/have it replaced.

[PWN3D_]

Hello @Aureliannn_ROG 
It would be nice to have an update of this since I still don't know if it's simply a hardware issue or not.

[PWN3D_]

@Aureliannn_ROG  I really need and anwser from the team now.

I have yet an other PG34WCDM with the same problems as the 3 previous ones!!

First ,it seems that those white lines are appearing when the monitor is set to 240hz only (when DSC is enabled?) and when it enter an left the G-Sync, in the 40 fps. Using a software like the Gsync pendulum demo like the video from the post above or Smooth Frog and quickly change the fps from 20 to 50 using the slider while make those white lines appears 100%.
I tried to set the monitor to 180hz and could not produce those line anymore. I believe DSC is off at 180hz. So the problem could be related to DSC.

Second, as I said in a previous post, it seems that the Oled Anti flicker option that come with MCM104 make those line not appears since it change the Gsync range from 40-240hz to i believe 160-240. I can't reproduce those lines and I fluctuate in between 150-170 fps. But the Oled anti flicker option is NOT implemented properly as I get randomly blackscreen with a message saying "OLED Anti Flicker is only supported in the limited refresh rate". This message appeared only once after the first blackscreen  while gaming but doesn't after other blackscreens until the monitor is turned off then on again.

Please you should really do something, Oled Anti flicker option NEVER do this on my PG27AQDM so I don't know what this "limlited refresh rate" supossed to mean, I'm on a 4090 and my frames are limited to 235 fps through Nvidia Control Panel and V-sync is on globaly as per the Blurbusters G-sync 101 recommended.

[PWN3D_]

@Aureliannn_ROG 

I've managed to video capture this OLED anti flicker message by simply playing Minicraft Java Edition in fullscreen, and press the Windows key to go back to the desktop and repeat. I also had it randomly during my session.

[PWN3D_]

@Aureliannn_ROG It's been two weeks since your last response. I don't really know what else to do to help your team reproduce those two problem and adress a fix.  I tried 4 units, tested at home and at the store, seller and technicians at the store also confirms those issues and don't know if its software or design problem. 

Do you guys needs more infos? more videos? more troubleshoots? Just communicate! 

[PWN3D_]

@Aureliannn_ROG More tests:
This white horizontal lines problem is not related to DSC. I tried to use an 2.1 HDMI cable and made sure to dissabled DSC from the monitor OSD. I was still getting those line at 240hz using Smooth Frog  and while playing Sea of thievs, on loading screen before a new game where frames can drop down to 5fps.

Also to my surprise and I guess I wasn't looking good enough for it, but at 180hz, 144hz, and 120hz, I was still getting those lines but they were less visibles the more I was stepping down on monitore frequency. At 60hz they was still there but it was really hard to look for them.

So I guess that those lines are related to the unfamous OLED VRR gamma flicker that I can also see on my PG27AQDM, the only things I can figure out is why on top of that, we get those white lines on the PG34WCDM which is just an ultrawide version of this panel... except a firmware issue..

Now for the OLED anti flicker message, I still don't know what I get it randomly and why my monitor just blackscreen. I could not test the OLED anti flicker option on HDMI since it seems to be not available (the option was greyed out no matter what), so I could not test further.

[Aureliannn_ROG]

Hi @PWN3D_ ,

Thank you for providing such detailed information. We understand that you are experiencing white lines when enabling G-Sync and an error message followed by a black screen when enabling OLED Anti Flicker. 

To help us pinpoint the problem more accurately, we would like you to confirm the following:

1. Prevalence of white lines: Regardless of the refresh rate you set in the OSD menu (180Hz, 144Hz, 120Hz, or 240Hz) and with all other settings reset to default, do the white lines still appear?
2. Firmware impact: Did the white line issue persist on firmware 104? You mentioned that the OLED Anti Flicker option in firmware 104 resolved the white lines, and we would like to confirm this further.
3. Prevalence of OLED Anti Flicker issue: Regardless of whether you use DisplayPort, HDMI, or other types of cables, does the error message and black screen issue occur when enabling OLED Anti Flicker?
4. Impact of refresh rate: What is your current display refresh rate? Does the error message still appear when you try to adjust the refresh rate? We understand that the OLED Anti Flicker function requires a refresh rate of 240Hz and a resolution of either 1440p or 1080p to work properly. Have you adjusted your monitor's settings to meet these requirements?
5. Computer specifications: To help us analyze the issue more comprehensively, please provide your computer's full specifications, including:
   CPU model:
   GPU model:
   Motherboard model:
   Memory size and frequency:
   Operating system version:
   Graphics driver version:
6. Other device information: If you are using any other peripherals (such as hubs, expansion cards), please provide that information as well.

To help us better understand the issue, could you please record a video of the problem and provide it to us in MP4 format?

Thank you.