PG32UCDM: Red Scanlines when changing Dolby Vision mode

[ScaryBandana]

UPDATE: Firmware MCM110 fixed this issue!

Hello,

I'm currently experiencing the following issue: When I change the Dolby Vision mode in the OSD on my PG32UCDM monitors while the monitor is running at 240Hz, certain colors have red scan lines.

In my case, the issue can be reproduced on all three of my PG32UCDM monitors if I either set the color #542554 as the Windows background color or fill a Microsoft Paint canvas with this color and then change the Dolby Vision mode in the monitor OSD.

So far, I've only been able to reproduce the issue with AMD graphics units (RX 7900 XTX and Ryzen 7950X3D integrated graphics); I couldn't reproduce the issue with a GTX 1080. AMD support informed me that my test with a GTX 1080 isn't comparable due to bandwidth limitations, and therefore a firmware issue cannot be ruled out.

Could someone with a PG32UCDM briefly check whether they can reproduce the issue and which graphics card they were using?

ASUS has checked the issue internally several times, but hasn't been able to reproduce it yet. I'm currently unsure if this is a local issue on my side.

[Aureliannn_ROG]

Hello @ScaryBandana ,

Thank you for your reply and the additional information. Our team is still actively conducting tests, but as of now, we have not been able to reproduce the same issue in our internal environment.

Since this issue appears to occur only in specific AMD graphics card configurations, we would like to further confirm whether you have received any response or update from AMD. If AMD plans to release any driver or firmware updates to address this behavior, we would greatly appreciate it if you could share that information with us so we can follow up promptly. We will also forward the feedback to the AMD team for their reference.

Should there be any further progress or findings from our side, we will keep you updated at the earliest opportunity. Thank you again for your patience and cooperation.

[ScaryBandana]

I received a response from AMD.
According to AMD, everything indicates that the problem is not caused by GPU rendering, but probably by the display or signal transmission. I was advised to contact ASUS again.

In AMD's first response mail, they told me that the GTX 1080, due to its low bandwidth, is not comparable to the much more powerful and newer HDMI/DisplayPort protocols, and that a firmware issue cannot be ruled out. So, it's possible that the problem isn't limited to AMD graphics cards.

I noted in my bug report that color #542554 is one of many colors that makes the problem visible. It's possible that other colors are affected in your test environment. I've attached a video with new test instructions. I recommend conducting the test in a light-controlled room (to avoid reflections) and bringing the monitor as close as possible during the test, as the error can be difficult to see in some cases.

It might also be helpful to maximize the window or drag it across the screen, as this makes possible errors more visible, as the error only occurs on the right half of the screen, an edge is created in the middle

[ScaryBandana · Accepted solution]

UPDATE: ASUS has informed me that they were able to reproduce the issue with my PG32UCDM unit, which I sent to ASUS.

Since I'm still in contact with ASUS via email, I'm marking this thread as resolved.