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PG32UCDP peak brightness issues

eproxus
Level 8

‎06-23-2025 05:14 AM

When using the PG32UCDP in Console HDR mode together with a Switch 2 and following the instructions from this video the amount of clicks required (39 in my case) seems to correspond to 470 nits according to the formula used. I also have a similar issue in the Windows HDR calibration (regardless of people think it should be used or not) in that it maxes out at 470 nits in any HDR mode (Gaming, Console, True Black 400).

This seems wrong to me? Shouldn't the Gaming and Console modes have a peak brightness of 1300 nits? For example, using this test video I cannot notice any difference on either Windows nor macOS. On the screen of my 16-inch MacBook Pro (2023) the brightness levels are clearly different all the way up to 1000 nits.

I want to point out that this is not a Windows issue specifically, but with all platforms I tested with (Windows 11, macOS 15.5, Switch 2 latest firmware, PS5 latest firmawre) indicating that it is perhaps more likely a problem with the monitor firmware. There also seems to be various other threads on the topic, both here and on Reddit so I'm not alone in having problems with this monitor.

I'm on the latest MCM106 firmware from January this year.

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3 REPLIES 3

Aureliannn_ROG
Customer Service Agent

‎06-25-2025 10:56 PM

Hi @eproxus ,

Regarding your report that the PG32UCDP monitor does not reach the expected 1300-nit peak brightness in various HDR modes (including Console HDR and Windows HDR Calibration), we’d like to assist our technical team with further investigation. Please kindly provide the following information:

  1. The serial number of your monitor (via private message)
  2. The HDR test videos or methods you used (please include links or sources, if available)
  3. What tools or references did you use to determine the peak brightness was only around 470 nits?
  4. In Gaming or Console mode, have you enabled any brightness-limiting settings (e.g., Tone Mapping, Eco Mode, Dynamic Dimming)?
  5. Your GPU model and operating system version (e.g., Windows 11 build number, macOS version)
  6. The HDMI or DisplayPort cable you are currently using — is it the original bundled cable, or a third-party cable?

Once we receive this information, we’ll forward it to our technical team for further analysis. Thank you for your cooperation and support!

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eproxus
Level 8
In response to Aureliannn_ROG

‎06-26-2025 08:08 AM

Hi @Aureliannn_ROG, thanks for your quick reply!

  1. Sent via private message
  2. They are linked in the above description
  3. I use the method described in this video, but it is consistent with any other calibration tool (Windows HDR Calibration and PS5 HDR calibration).
  4. No settings seem to make a difference, and there is no difference between Console and Gaming (or DisplayHDR 400 True Black for that matter). I have also tried to reset the display to the default, but the problem persists.
  5. Details
    1. Windows 11 24H2 (build 26100.4351), together with a Nvidia RTX 4070 FE card
    2. macOS 15.5 on a MacBook Pro 2023 16"
    3. Switch 2 on firmware 20.1.5
  6. See below
    1. Windows is connected with the DisplayPort cable that came with the display
    2. The MacBook is connected with the USB-C cable that came with the display
    3. The Switch 2 is connected with the cable that came with the Switch

To expand on point 3, I base this on the fact that any HDR calibration tool indicate the max nits is 470 once any test pattern disappear.

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eproxus
Level 8
In response to Aureliannn_ROG

‎07-09-2025 03:54 AM

@Aureliannn_ROG Any updates on this? Thanks. ☺️

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