Hi. I have an Precision 5520 laptop running the latest Manjaro KDE. The laptop has a built in Intel iGPU and an onboard Nvidia Quadro M1200 dGPU. I installed the NVidia drivers as per the instructions here .
Everything worked fine and KDE performed smoothly with the 415.xx driver on the dGPU. Not happy with the muscle of the M1200, I got a Akitio Node with GTX 1070 and connected it as eGPU through my Thunderbolt port. Got everything to work on the same Nvidia 415.xx driver, with the driver using the eGPU for rendering to an external monitor. When the eGPU is disconnected, it connects back to the Intel iGPU.
When on the eGPU, KDE starts performing slowing with lots of input lag and dropped frames. The applications seem to work well, but its KDE thats horribly janky. KDE was pretty smooth on an underpowered M1200, but was suprised to see it perform horribly on more capable hardware. I checked around and tried the TripleBuffering, Composite Pipeline and GL_YIELD="USLEEP", but none seem to work.
Anyone else facing the same issue? Would appreciate any suggestions to fix this. I love KDE and would hate to switch to another DE due to this issue