Thanks for your info but please reply my questions.
I only care about this monitor and don’t need to know the status of other screen at this moment.
First, please confirm below info from #1 is from your nano and that problematic monitor.
Screen 0: minimum 8 x 8, current 5120 x 1600, maximum 16384 x 16384
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 480mm x 260mm
1920x1080 60.00*+ 75.00 60.00 59.95 50.00
1366x768 75.00 60.00
1280x1024 75.03 60.00
1280x720 60.00 59.94 50.00
1024x768 75.03 70.07 60.01
800x600 75.00 72.19 60.32 56.25
640x480 75.00 72.81 67.06 59.94
DP-0 connected 3200x1600+1920+0 (normal left inverted right x axis y axis) 800mm x 450mm
3200x1600 90.00*+ 70.00
1920x1080 60.00 59.95
If yes, then there is a 1920x1080 60 fps mode, could you change mode to that mode and see if your monitor can output it?
Please also tell us if 1080p mode has below issue or not.
Do you only see this flicker problem with 90fps mode, or do you see the same issue with other modes as well?
If this issue does not happen, then why did you see? A blanked screen? Any dmesg with that case?