How to get description of minor opcodes for NV-CONTROL extension?


I am facing following error(only relevant excerpt shown) when applying blending over my multi-projector display system, using NVIDIA Warp Blend API:

X error of failed request: Bad value(integer parameter out of range for operation)

Major opcode of failed request: 155 (NV-CONTROL)
Minor opcode of failed request: 9 ()

As part of debugging, I would like to know, which operation does this minor opcode represent?