Can't set my DisplayPort monitor to 144 Hz in Windows 10 October 2018 Update
I just updated to Windows 10 October 2018 Update (1809), and I can't set my main monitor to 144 Hz. It is connected via DisplayPort, and I have no problem setting the refresh rate in my other monitors.
Also, if I set the refresh rate to 120 Hz or 60 Hz on my main monitor, it will go down to 59 or 119 Hz. I have clean-installed the latest graphics drivers (NVIDIA 411.70) to no help.
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I've identified the culprit: duplicating a signal. I have a monitor and my AV-Receiver connected via HDMI to get Dolby TrueHD and DTS-HD, duplicating the "image" on the AV receiver so it won't act as another screen that I can't see. When duplicating both
screens, the refresh rate goes down to 120 Hz. Disconnecting the HDMI cable por the AV Receiver solves the problem, but you still have to fix it because it worked properly before.
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