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-dxlevel <level>
===========
- Forces a specific DirectX version when launching the engine. This is useful if your graphics card is DirectX 9 capable, but a lot faster using only DirectX 8 (e.g. NVidia GeForce FX 5200). Multiply the desired DirectX version to use with ten. E.g. for DirectX 8.0 you would use -dxlevel 80. For DX9 there are three possible values depending on the Shader Model the graphics card supports. See mat_dxlevel.
mat_dxlevel
=========
mat_dxlevel [DirectX version]
mat_dxlevel 70
mat_dxlevel 80
mat_dxlevel 81
...
mat_dxlevel 90 - DX9 with Shader Model 2
mat_dxlevel 95 - DX9 with Shader Model 3
https://developer.valvesoftware.com/wiki/Command_Line_Options#Command-line_parameters
may turn out to return (0) which in turn sets it to directx8 thinking there is a directx <= 8....
I may be returning value of 10 or 11 and have the automatic register as 00 which defaults to pre directx 8.
Just my theory.
Episode 2 and Lost Coast are working fine, showing 9.0c+ in menu. Valve really need to fix it...
Directx 9.0c = better shading quality but could eat up performance.
In a nutshell, every action has consequences.