libnvidia-tls.so.340.65 and libnvidia-glcore.so.340.65 are distinctly from the nvidia proprietary driver, your system gl environment is inconsistent. ldd /usr/lib/libGL.so.1 and see if it's looking for those libraries.
That is good thinking... I used to have the nvidia drivers installed before my previous mobo died and nvidia decided to stop working while nouveau still continued to work for a while longer. It seems that it added libraries not included in /var/log/packages/ so that it never got cleaned up properly...
$ ldd /usr/lib/libGL.so.1
linux-gate.so.1 (0xf7772000)
libnvidia-tls.so.340.65 => not found
libnvidia-glcore.so.340.65 => not found
libX11.so.6 => /usr/lib/libX11.so.6 (0xf74de000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xf74c6000)
libc.so.6 => /lib/libc.so.6 (0xf7326000)
libdl.so.2 => /lib/libdl.so.2 (0xf731e000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0xf72f6000)
libXau.so.6 => /usr/lib/libXau.so.6 (0xf72ee000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0xf72e6000)
/lib/ld-linux.so.2 (0x5657b000)
$ ls -l /usr/lib/libGL.so.1
lrwxrwxrwx 1 root root 15 Nov 18 14:28 /usr/lib/libGL.so.1 -> libGL.so.340.65
Here is a diff of two quick lists I made, libgl1 are libraries in /usr/lib/ and libgl2 are files that match "lib/libGL" owned by packages installed on my system.
--- libgl1 2015-11-26 21:46:10.888381293 -0800
+++ libgl2 2015-11-26 21:48:57.820630487 -0800
@@ -1,22 +1,10 @@
libGL.la
-libGL.so
-libGL.so.1
libGL.so.1.2.0
-libGL.so.340.65
libGLESv1_CM.la
-libGLESv1_CM.so
-libGLESv1_CM.so.1
libGLESv1_CM.so.1.1.0
libGLESv2.la
-libGLESv2.so
-libGLESv2.so.2
libGLESv2.so.2.0.0
-libGLEW.so
-libGLEW.so.1.10
libGLEW.so.1.10.0
-libGLEWmx.so
-libGLEWmx.so.1.10
libGLEWmx.so.1.10.0
libGLU.la
-libGLU.so
-libGLU.so.1
libGLU.so.1.3.1
Looking this list it seems several packages are owned by mesa and glew, now I already reinstalled mesa several times and everything looks fine with its libraries with ldd. Also I noted that symlinks aren't listed in /var/log/packages/.
$ ldd /usr/lib/libGL.so.1.2.0
linux-gate.so.1 (0xf7704000)
libexpat.so.1 => /usr/lib/libexpat.so.1 (0xf7616000)
libglapi.so.0 => /usr/lib/libglapi.so.0 (0xf75f6000)
libXdamage.so.1 => /usr/lib/libXdamage.so.1 (0xf75ee000)
libXfixes.so.3 => /usr/lib/libXfixes.so.3 (0xf75e6000)
libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0xf75de000)
libxcb-glx.so.0 => /usr/lib/libxcb-glx.so.0 (0xf75c6000)
libxcb-dri2.so.0 => /usr/lib/libxcb-dri2.so.0 (0xf75be000)
libxcb-dri3.so.0 => /usr/lib/libxcb-dri3.so.0 (0xf75b6000)
libxcb-present.so.0 => /usr/lib/libxcb-present.so.0 (0xf75ae000)
libxcb-randr.so.0 => /usr/lib/libxcb-randr.so.0 (0xf759e000)
libxcb-xfixes.so.0 => /usr/lib/libxcb-xfixes.so.0 (0xf7596000)
libxcb-render.so.0 => /usr/lib/libxcb-render.so.0 (0xf7586000)
libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0 (0xf757e000)
libxcb-sync.so.1 => /usr/lib/libxcb-sync.so.1 (0xf7576000)
libxshmfence.so.1 => /usr/lib/libxshmfence.so.1 (0xf756e000)
libXxf86vm.so.1 => /usr/lib/libXxf86vm.so.1 (0xf7566000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xf754e000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xf7406000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0xf73de000)
libXau.so.6 => /usr/lib/libXau.so.6 (0xf73d6000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0xf73ce000)
libdrm.so.2 => /usr/lib/libdrm.so.2 (0xf73be000)
libm.so.6 => /lib/libm.so.6 (0xf736e000)
libpthread.so.0 => /lib/libpthread.so.0 (0xf734e000)
libdl.so.2 => /lib/libdl.so.2 (0xf7346000)
libc.so.6 => /lib/libc.so.6 (0xf71a6000)
/lib/ld-linux.so.2 (0x56630000
However the glew libraries aren't alright...
$ ldd /usr/lib/libGLU.so
linux-gate.so.1 (0xf7794000)
libGL.so.1 => /usr/lib/libGL.so.1 (0xf75be000)
libglapi.so.0 => /usr/lib/libglapi.so.0 (0xf759e000)
libXdamage.so.1 => /usr/lib/libXdamage.so.1 (0xf7596000)
libXfixes.so.3 => /usr/lib/libXfixes.so.3 (0xf758e000)
libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0xf7586000)
libxcb-glx.so.0 => /usr/lib/libxcb-glx.so.0 (0xf756e000)
libXxf86vm.so.1 => /usr/lib/libXxf86vm.so.1 (0xf7566000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xf754e000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xf7406000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0xf73de000)
libXau.so.6 => /usr/lib/libXau.so.6 (0xf73d6000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0xf73ce000)
libdrm.so.2 => /usr/lib/libdrm.so.2 (0xf73be000)
librt.so.1 => /lib/librt.so.1 (0xf73ae000)
libpthread.so.0 => /lib/libpthread.so.0 (0xf738e000)
libdl.so.2 => /lib/libdl.so.2 (0xf7386000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xf720e000)
libm.so.6 => /lib/libm.so.6 (0xf71be000)
libc.so.6 => /lib/libc.so.6 (0xf701e000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0xf6ffe000)
/lib/ld-linux.so.2 (0x5655d000)
libnvidia-tls.so.340.65 => not found
libnvidia-glcore.so.340.65 => not found
So I took this opportunity to reinstall glew, both the 64 bit and compat32 packages. However this did not make much difference.
$ grep lib/libGLU.so /var/log/packages/*
/var/log/packages/glu-compat32-9.0.0-x86_64-1compat32:usr/lib/libGLU.so.1.3.1
$ ldd libGLU.so.1.3.1
linux-gate.so.1 (0xf7766000)
libGL.so.1 => /usr/lib/libGL.so.1 (0xf758e000)
libglapi.so.0 => /usr/lib/libglapi.so.0 (0xf756e000)
libXdamage.so.1 => /usr/lib/libXdamage.so.1 (0xf7566000)
libXfixes.so.3 => /usr/lib/libXfixes.so.3 (0xf755e000)
libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0xf7556000)
libxcb-glx.so.0 => /usr/lib/libxcb-glx.so.0 (0xf753e000)
libXxf86vm.so.1 => /usr/lib/libXxf86vm.so.1 (0xf7536000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xf751e000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xf73d6000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0xf73ae000)
libXau.so.6 => /usr/lib/libXau.so.6 (0xf73a6000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0xf739e000)
libdrm.so.2 => /usr/lib/libdrm.so.2 (0xf738e000)
librt.so.1 => /lib/librt.so.1 (0xf737e000)
libpthread.so.0 => /lib/libpthread.so.0 (0xf735e000)
libdl.so.2 => /lib/libdl.so.2 (0xf7356000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xf71de000)
libm.so.6 => /lib/libm.so.6 (0xf718e000)
libc.so.6 => /lib/libc.so.6 (0xf6fee000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0xf6fce000)
/lib/ld-linux.so.2 (0x5656e000)
libnvidia-tls.so.340.65 => not found
libnvidia-glcore.so.340.65 => not found
So now I tried removing libGL.so.1 and libGL.so.340.65 from /usr/lib and then symlinked libGL.so.1 to libGL.so which is in turn symlinked to libGL.so.1.2.0 (Kind of a messy solution...) since the glew libraries still wanted libGL.so.1.
Finally I tried launching the steam client again and now it works once again! Thanks for you helpful pointer! I will now close this issue.
Nothing extracted yet.
For quite a while now I get this whenever I try to start the steam client.
Additionally if I try to start a game through its binary, I get something like this (Assuming it doesn't complain about the steam-client not being started).
If I understand it right, Shadowrun does not even require the nvidia libraries, only the steam runtime.
As far as using nouveau goes, nvidia only offers better performance with a few new games and hardware decoding for videos. While nouveau is far more reliable and does things like tty far better so I would really like to continue using nouveau which works great with many of the games I would play like Torchlight 2, Baldur's Gate or Deus ex 1.