Thanks.
Certainly sounds like a software bug if 'modeset' is being used while
the nvidia driver is installed.
** Summary changed:
- 20.04beta: Cannot set 3840x2160
+ Nvidia driver installed but Xorg uses modeset on the Nvidia card.
** Changed in: nvidia-graphics-drivers-435 (Ubuntu)
Status: Incomplete => New
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1870637
Title:
Nvidia+modeset: Can't set 4K@60Hz: HDMI max TMDS frequency 300000KHz
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