That may be exactly the issue. It looks like Spring is trying to use the Intel card based on lines 30-35:
Video mode set to 1024x768/32bit (windowed)
[f=0000000] SDL: 1.2.10
[f=0000000] GL: 2.1.0 - Build 8.15.10.2202
[f=0000000] GL: Intel
[f=0000000] GL: Intel(R) HD Graphics
[f=0000000] GLSL: 1.20 - Intel Build 8.15.10.2202
I see no mention of your nvidia 3100m anywhere in the file.