Soma will not start, 4.0.10188 Compatibility Profile Context

[Funman]

I'm having basically this exact same problem. I have a dedicated AMD and an integrated Intel HD graphics card, but my hpl.log file shows that the ATI card is being used by the game, not the Intel card. For whatever reason it won't let me attach the hpl.log file, but here's what it shows at the beginning:

Spoiler below!

Initializing Graphics Module
--------------------------------------------------------
Init lowlevel graphics: -1x-1 bpp:32 rr: 60 fs:0 ms:0 driver: 0 cap:'SOMA Loading...' pos-1x-1)
Available drivers:
(0) - 'windows'
(1) - 'dummy'
Creating window: (-1,-1) 1600 x 900 - 32 bpp flags: 3
Setting display mode: 1600 x 900 - 32 bpp 60 hz
Init Glew...OK
Setting up OpenGL
Vendor: ATI Technologies Inc.
Renderer: ATI Mobility Radeon HD 5650
Version: 4.0.10188 Compatibility Profile Context
Max texture image units: 16
Max texture coord units: 16
Max texture buffer size: 268435456
Max texture array slices: 8192
Max user clip planes: 8
Two sided stencil: 1
Vertex Buffer Object: 1
Anisotropic filtering: 1
Max Anisotropic degree: 16
Multisampling: 1
Texture compression: 1
Texture compression S3TC: 1
Texture compression 3DC: 1
Texture sRGB: 1
Geometry Instancing: 1
Auto generate MipMaps: 1
Render to texture: 1
Max draw buffers: 8
Max color render targets: 8
Packed depth-stencil: 1
Texture float: 1
GLSL Version: 4.00
ShaderModel 2: 1
ShaderModel 3: 1
ShaderModel 4: 1
Max vertex uniforms: 4096
Max fragment uniforms: 1024
OGL ATIFragmentShader: 1
Tesselation: 0
MultiBindTex: 0
ERROR: Failed to compile GLSL shader ''!
Shader code:
-------------------
[0001] #version 330
[0002] #extension GL_ARB_explicit_attrib_location : enable
[0003] #extension GL_ARB_uniform_buffer_object : enable
[0004] #extension GL_ARB_shading_language_420pack: enable
[0005] ////////////////////////////////////////////////////////
[0006] // Deferred Skybox - Fragment Shader
[0007] //
[0008] // samples a cubemap skybox
[0009] ////////////////////////////////////////////////////////
[0010]
[0011]
[0012]
[0013] layout(binding = 0) uniform samplerCube aSkyMap;
[0014]
[0015] in vec4 px_vPosition;
[0016] in vec4 px_vTexCoord0;
[0017] in vec4 px_vColor;
[0018] layout(location = 0) out vec4 out_vColor;
[0019]
[0020] void main()
[0021] {
[0022] vec4 px_vPosition = gl_FragCoord;
[0023] bool px_bFrontFacing = gl_FrontFacing;
[0024] int px_lPrimitiveID = gl_PrimitiveID;
[0025]
[0026]
[0027] vec4 vFinalColor;
[0028]
[0029] ////////////////////
[0030] //Diffuse
[0031] vFinalColor = texture(aSkyMap, px_vTexCoord0.xyz);
[0032]
[0033] //Convert color to linear space if needed
[0034]
[0035] vFinalColor.rgb = pow(vFinalColor.rgb, vec3(2.2));
[0036]
[0037]
[0038]
[0039] // Multiply with 8.0 to increase precision
---------------------
Compile log:
---------------------
Fragment shader failed to compile with the following errors:
WARNING: 0:4: warning(#62) enable/warn/disable extension isn't found, extension 'GL_ARB_shading_language_420pack' is not supported
ERROR: 0:13: error(#279) Invalid layout qualifier 'binding'
ERROR: error(#273) 1 compilation errors. No code generated