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pg27aqn ulmb2 pulse width setting does nothing

Level 8

Changing the pulse width makes zero difference to the visible crosstalk at 360hz and 240hz. Seems like a bug. The flash start point does not get moved later into the frame but apparently is shortened on the ending point or possibly equally from the start and end point. Or perhaps it isn't doing anything and is simply turning down the brightness. Seems like a bug


Super Moderator



Are there any ongoing threads regarding this behaviour elsewhere?

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Level 8

Doubt it, it's not a popular monitor because of the price. It wouldn't be a problem if there was adjustable strobe phase too, you could simply move the flash start point later. But since the only option is pulse width reduction on the flash endpoint only, and the strobe phase is very early in the refresh cycle, it effectively makes the crosstalk artifacts worse by reducing it. There's literally no point to it being there as it's implemented now.

Customer Service Agent

Hello, @pg27aqnowner 

May I ask if you have experienced any abnormalities in terms of screen flickering, resolution, or color performance since you mentioned strobe light control?
Regarding this, have you updated the firmware version to the latest release, which was published on the ROG Swift 360Hz PG27AQN official website on May 26, 2023?
What type of connection are you using, and which signal source are you connecting to when encountering these issues?
If you have performed cross-testing or restored the display to default settings, has it improved or helped to isolate the problem?
Could you please provide further details to help us better understand your current issue?

Thank you.