HP Omen 15 [Ryzen 4600h + Nvidia 1660Ti] - no display over HDMI

Scrolling feels sluggish when running Xserver on NVidia. On searching, it may be due to Prime Synchorinzation being disabled. Tried enabling it using following guide: How to enable PRIME Synchronization? - #3 by zibri1

Output says that drm modeset is enabled:

$ sudo cat /sys/module/nvidia_drm/parameters/modeset
Y

Does not seem to be working though:

$ xrandr --output HDMI-0 --set "PRIME Synchronization" 1
X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  11 (RRQueryOutputProperty)
  Serial number of failed request:  53
  Current serial number in output stream:  53

Am I missing something? This is with Xfce 4.14 on Ubuntu 20.04 with composting enabled. Can open a new topic for this as appropriate.

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