I have Asus N550JK laptop with Manjaro Linux installed. The CPU is i7 4700HQ, the dedicated GPU is Geforce GTX850m. It seems that there is a gpu driver problem in my laptop, because the score of integrated graphics in glmark2 is higher than the score of nvidia gpu. This is the information that glmark2 provides about external gpu when I run it using DLI_PRIME=1:
$ DRI_PRIME=1 glmark2 ======================================================= glmark2 2017.07 ======================================================= OpenGL Information GL_VENDOR: nouveau GL_RENDERER: NV117 GL_VERSION: 3.1 Mesa 18.2.3
And the score of this benchmark is only 700 points. I tried to switch to proprietary nvidia driver, but during loading I got only black screen. What is the problem of low perfomance of the gpu?