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RX580 4k hdr 60fps with second monitor not work

Question asked by mmis1000 on Jan 21, 2020

I recently buy a LG 27UL550-W 4k hdr monitor.

 

My current setup is.


Graphic Card:

Rx580

Two monitor:

  1. LG 27UL550-W
    • 4k@60fps + hdr + freesync
    • via DP
  2. Another monitor
    • 1080p@75fps
    • via HDMI

The 4k hdr 60fps works fine when it is used alone.

 

But when the second monitor was pluged in.
The 4k monitor was suddenly locked at 30fps.
No matter how I change the refresh rate in windows setting, it is always immediately change back to 30fps.

Has anyone encountered the same problem?
How did you solved that?

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