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XG27UCDM: aggressive ABL in HDR mode causing flickering

tgrozier
Level 7

‎04-28-2025 09:33 PM

Hi I've been using the XG27UCDM for about two weeks now and really enjoy it. However, I just ran into an instance of ABL causing flickering. I had a twitch stream in one window and was looking at some code in another - the twitch stream would cause uncomfortable flickering in the rest of the screen even though the video player was quite small. After doing some research, I realize this is a problem all OLEDs experience. I was able to fix the problem by turning off HDR but clearly I'd like to use HDR. Is there another workaround? Could this be fixed with a firmware update? I have switched to SDR and turned on Uniform Brightness but I'd prefer to use HDR. 

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Aureliannn_ROG
Customer Service Agent

‎04-28-2025 11:46 PM

Hi @tgrozier ,

thank you for contacting us. To more accurately analyze the display issue you are experiencing, we kindly request that you provide a video recording of the problem occurring (please provide in MP4 file format).

Additionally, we would like to confirm the following information:

  1. Did this issue occur immediately upon receiving the device?
  2. Have you tried cross-testing with different cables and devices? Does the problem occur with different connection methods?
  3. Does the issue completely disappear when HDR is turned off?
  4. What is the frequency of the problem occurrence? Does the flickering start immediately upon enabling HDR?
  5. Please provide the steps to reproduce the issue so that our technical team can perform testing.
  6. Finally, please provide detailed information about your computer specifications, operating system version, BIOS version, and graphics card driver version for our reference.

Thank you for your cooperation and assistance. We will carefully analyze the information you provide.

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tgrozier
Level 7
In response to Aureliannn_ROG

‎05-03-2025 02:10 PM

https://streamable.com/r3pf2d

https://streamable.com/20l3qq

Here's the flickering when HDR TrueBlack400 is enabled instead. Much less.

Doesn't let me upload .mp4 so here's a streamable link.

1. No this issue was only noticed about a month after I bought the monitor. 

2. No i haven't tried with different cables. 

3. Yes the issue completely disappears when HDR is turned off. The issue also disappears if I use the HDR TrueBlack 400 mode too. 

4. The frequency of the problem occurrence is immediate when I use a HDR mode other than TrueBlack 400. I need to have a video playing to get the flickering. 

5. I just split screen, have a video playing in one half and a text page on the other. You can see flickering on the text page. 

6. M4 Mac Mini OS Version: macOS 15.4.1 (Build 24E263)
Architecture: arm64e
Report Version: 60

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