Same issue to me, my laptop is Medio Akoya P8612, with nVidia Geforce GT 555M. Im using the laptop monitor and a HDMI connected monitor.
My history: -- Fresh install of Ubuntu 14.04 -- Install "proprietary tested" Nvidia drivers 331 via "Software & Updates" -- everything seems to work fine, xrandr is not detecting any unknown/bad monitors -- BUT nvidia-settings tell me I cant use prime. -- I switch from "proprietary tested" to "proprietary" Nvidia drivers 331 >>updates<< via "Software & Updates" -- after restart following behaviour: -- built in display (laptop display) -- hdmi display (external monitor) ## vga display (integrated window on the external monitor -- (inscreen display)) cannot change that behaviour other than changing from nvidia performance mode to nvidia power safe Any fixes on that issue yet? Here is xrandr output with HDMI monitor plugged in: Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384 ** Attachment added: "xrandr output" https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1296020/+attachment/4128933/+files/xrandr.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1296020 Title: [Asus U36JC] Non-existent display detected in both intel driver and nvidia driver (Optimus Laptop) (ubuntu trusty 14.04) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1296020/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
