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Goddard
Asked: 2015-10-13 11:25:36 +0800 CST

nvidia black screen at lightdm when switching from intel to nvidia gpu

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Nvidia Prime and graphics switching is broken for me.

I can use my Intel graphics fine, but if I try and switch to Nvidia it just shows a black lightdm screen. I know it boots because I can hear the greeter sound.

I tried changing the resolution before I switched and still a black screen.

Any ideas how I can get this working?

I am just trying to use CUDA honestly and don't need to switch if I can just use CUDA.

./devicequery returns nothing when in Intel graphics mode so I figured I had to get into Nvidia graphics mode.

Using 352 with CUDA 7.5

nvidia

1 Answers

  1. Best Answer

    After banging my head against the wall for 2 days I figured out why it wasn't working.

    I should mention I installed CUDA 7.5 and that also installs Nvidia drivers 352. I also have a fresh copy of 14.04.3 installed and only updated before installing those CUDA drivers from Nvidias website.

    After looking at the Xorg log I found GLX wasn't loading. I learned that first a kernel module gets loaded and then GLX and then something like LibGL. To fix the GLX issue I installed a few packages.

    sudo apt-get install bumblebee bumblebee-nvidia linux-headers-generic

    After doing that everything worked to my surprise. I have no idea why this isn't installed in the process, but I reported the bug to Nvidia either way.

    I'm just starting messing around with CUDA, but it seems like this shouldn't of took 2 days to get working.

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