Recently I installed STEAM on my Lenovo IdeaPad Y510p (core i7 + nVidia 750m) laptop running Ubuntu 14.04.1. I want to use nVidia for sessions when I play games and Intel for everything else. Therefore I installed nVidia drivers (tried several times, binnary from nVidia site and from Ubuntu repo but never from PPA).
Lightdm never manage to display login screen when nVidia is selected (using primus or nVidia prime indicator applet or nvidia-settings). Screen is black(blank), no mouse arrow and system does not freeze, I can hear drum start-up sound and I can switch to console by pressing ctrl+alt+f1 and logon successfully in terminal (I use this session to switch back to intel using terminal).
I checked brightness setup while using terminal, changed them both (acpi and intel) to max and it didn’t help (brightness is reflected terminal sesion but switching to lightdm with ctrl+altf7 or restart lightdm is the same black/blank). Connecting external TV on HDMI also didnt help (same “picture” is shown on both diplays: when on intel it’s ok and when on nVidia both is black/blank). in BIOS I have no options related to GPUs…
I’m under impression that issue is not with driver - but on lightdm side or x side - like they cannot pick the right connector to send picture to display… Both next commands works, but I can only see black display when switching to nvidia
sudo prime-switch nvidia sudo prime-switch intel
Any help is appreciated! I already tried everything else from web but it dint helped My laptop never freezes and because of that I think the issue is not the same…
One remark: In the past I used to have proprietary drivers works perfectly in SLI mode (this laptop support secong nVidia in ultrabay). Then I pull out ultrabay grpahics card because I aimed for longer battery life. With empty ultabay system work ok using integrated GPU. Now I want to use discreete GPU (still with empty ultrabay - not in SLI mode).