[elrepo] skylake, nvidia, bumblebee

[Manuel Wolfshant]

On 10/06/2016 04:15 PM, Nicolas Thierry-Mieg wrote:
> Hello,
>
> as mentioned a few weeks ago I am trying to get C7 fully functional on 
> a new Acer Aspire E5-575G-55DE laptop, which has an intel i5-6200U 
> with integrated HD Graphics 520 as well as a nvidia GeForce GTX 950M.
>
> Thanks to advice from this list I got the intel graphics to work with 
> the standard EL7 kernel by adding i915.preliminary_hw_support=1 to the 
> kernel options.
>
> I then followed the instructions from http://elrepo.org/tiki/bumblebee 
> to install the nvidia kmod and driver, as well as bumblebee. After 
> rebooting I get a "Oh no! Something has gone wrong" screen.
>
> I managed to fix this by
> sudo mv /usr/lib64/xorg/modules/extensions/nvidia/ /usr/lib64/xorg/
> and modifying XorgModulePath accordingly in bumblebee.conf .
>
> Everything now works: I can now boot in X mode (using the intel gpu) 
> and start applications using the nvidia gpu with optirun.
>
> Comparing the Xorg.0.log files between initial (broken) install and 
> after my fix, the main difference is (removing timestamps for 
> readability):
>
> BROKEN:
> (II) LoadModule: "glx"
> (II) Loading /usr/lib64/xorg/modules/extensions/nvidia/libglx.so
> (EE) Failed to load 
> /usr/lib64/xorg/modules/extensions/nvidia/libglx.so: 
> libnvidia-tls.so.367.44: cannot open shared object file: No such file 
> or directory
> (II) UnloadModule: "glx"
> (II) Unloading glx
> (EE) Failed to load module "glx" (loader failed, 7)
>
> FIXED:
> (II) LoadModule: "glx"
> (II) Loading /usr/lib64/xorg/modules/extensions/libglx.so
> (II) Module glx: vendor="X.Org Foundation"
>     compiled for 1.17.2, module version = 1.0.0
>     ABI class: X.Org Server Extension, version 9.0
> (==) AIGLX enabled
>
>
> So it seems that when the nvidia libglx is in 
> /usr/lib64/modules/extensions/nvidia/libglx.so , X tries to load that 
> instead of the correct /usr/lib64/xorg/modules/extensions/libglx.so .
>
I might be wrong but I think that you did not fix it correctly.
nvidia comes with its own libglx and /etc/Xorg.d/*nvidia.conf properly 
tells Xorg to load it from /usr/lib64/xorg/modules/extensions/nvidia/. 
The real issue is that the module cannot find libnvidia-tls.so.367.44