Reactable Clone on Samsung SUR40 PixelSense Reactivison

Reactivision Reactable Clone on Samsung SUR40 Microsoft Surface PixelSense. https://modin.yuri.at/publications/sur40_iss2016.pdf Linux Ubuntu 16.04.7 LTS xenial (Kernel 4.4.0 - 210 - generic) on SUR40. Reactivision 1.5 Linux on SUR40. The SUR40 Reactivision OSC signal is sent to the Mac via UPD. PureData extended 0.43.4 + GEM on (Mac OS X 10.14.6) The Mac handles the sound and GEM graphics. The GEM graphics signal from Mac is sent to the HDMI input of the SUR40. (The SUR40 CPU only handles reactivation; graphics and sound are handled by the Mac to improve performance.) (Unfortunately, the brightness cannot be adjusted in Reactivision for the SUR40; settings in Linux are not applied by Reactivision. I would be very grateful for help in solving this Linux/Reactivision problem.) Kandy Modular Reactivision Synthesizer 1.8