Xrandr displaying “Failed to get size of gamma for output default”
问题 My Sys specs : **Intel i7-8700k (Coffe-lake),Mother board : ROG(Maximus X Hero) OS :Ubuntu-Gnome 16.04** I booted My new PC with Ubutnu-Gnome16.04 , after installation the screen resolution is 1024x768(4:3) --and screen is shown "Unknown Display". I havent installed anything in my new OS.My Monitor-CPU connecting Cable is DP(Pin Cable). I have tried with "Force create new resolution": a)cvt 1366 768 60 b)xrandr --newmode "< >" Then Error throws as : "xrandr : Failed to get size of gamma for