Wayland Monitor Refresh Rate

Running a wayland session with the sway-wm and a GTX1070 I cannot find any way to change the monitors refresh rate to something different than the 60Hz standart. Neither xrandr nor nvidia-xsettings does help in this case. I need 50Hz because I live in europe and we use 50Hz for television broadcast to have smooth playback.

xrandr shows me this:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
XWAYLAND0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1920x1080     59.96*+

nvidia-xsettings gives that:

ERROR: Unable to find display on any available system

The graphics driver is installed correctly, ordinary XServer runs fine.

System:
4.9.1-gentoo
x86_64 Intel® Core™ i7-6700K CPU @ 4.00GHz
nvidia-drivers-381.09

I don’t think XWayland has any way of changing the refresh rate through its connection to the Wayland compositor. You’ll have to use the compositor’s native mode selection tools instead.

Thank you, I received an answer from a developer of the wm. Its is currently not implemented but planed and ONLY supported for the opensource driver.