Bug for multi-monitor with different refresh rate after sleep

Support Graphics & Display
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21

gived up kde… already re-installed xfce…

22

Hi, I did few more experiments:

  1. without second monitor, my laptop 240hz works fine (sleep then wake up)
  2. if my laptop is on 240hz, the problem will show if I plug in the second monitor, and the second screen is copying laptop’s screen
  3. when the problem appears, I can set the laptop screen to 60hz and then back to 240hz, it works normal.
  4. when problem appears, I can unplug the monitor (HDMI), and set to 60hz then plug in then set to 240hz. it will work fine
23

I think it is due to nvidia drive, see this post