Llvmpipe is enabled in mesa at compilation time and actually modifies the swrast_*.so the last time I checked. Not runtime configurable. Also, I know at one point it had issues running on 32 bit machines. Not sure if that's still the case.
I think this is for applications not for graphical server
idk, but i would try switching of DRM/DRI (Direct Rendering Manager/Direct Rendering Interface). it's X hardware rendering.
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