Hello,
Thought I'd share my problems with the monitor so far (email I sent to Asus support):
Issue:
When the following settings are configured there is a white flashing line at the very top of the screen, this is only the case when there is dark/light colour next to each other, if you have a solid colour background for example, the flashing lines are not present (this also happens in games).
- G-sync is enabled within Nvidia Control Panel
- 138hz is selected on both the monitor and within the Nvidia Control Panel
- 10bit colour is selected within the Nvidia Control Panel
If any of the above settings are changed e.g. G-sync disabled, and/or 120hz is enabled and/or 8bit colour is selected instead, the issue goes away; it only happens when all 3x settings are set to the above.
An example of this can be seen at:
https://youtu.be/QCxstdE28-g
This has been the case now on 2x PG42UQ monitors, the first one was replaced, and the replacement arrived today with the same issue.
What I've tried:
- I've tried 3x DP 1.4 cables (one that comes with the monitor, a 'cable matters' one that was recommended, and a braided 8k DP 1.4 cable from Amazon) - this doesn't fix the issue.
- Tried each of the DP outputs on my GPU - still the same issue.
- The original monitor was upgraded from V23 to V31 of the firmware - still the same issue.
- Replacing the monitor entirely - still the same issue.
- As stated above, disabling gsync, changing to 120hz or changing to 8bit colour fixes the issue.
- Turned on hardware-accelerated GPU scheduling, and variable refresh rate within Window's graphic settings.
- Tried with both fullscreen and fullscreen/windowed gsync settings.
- Enabled 'display specific settings' within the Nvidia control panel although there is a warning (on both monitors) to say this monitor is not validated as 'g-sync compatible' (although it's sold as g-sync compatible).
- Tried On/Off/Fast within 3D settings - same issue (FPS locked to 134FPS).
- Ensured monitor technology is selected as 'G-SYNC Compatible' within 3D settings.
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On the first monitor it was happening all the time, but on the second replacement monitor it happens randomly but using a background that has a single colour along the top of it means I don't notice it (and haven't noticed it in games either), Asus support are still looking into it and have been asking about my GPU (3090).
I haven't tried HDMI 2.1 (yet).
Has anyone else experienced this?
Cheers!