there is no AUX_P/N in DP149 and just confirm GPU's AUXp/N connecting to SDA_SRC and SCL_SRC of DP149 with 2K pullup to 3.3V .
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DDC is display data channel it uses I2C(SCL/SDA)
If the GPU only has AUX port, this port may send I2C compliant levels or I2C-over-AUX when CAD=H.
DP149 implement clock stretching, if you face interoperability issues you would have to implement DDC snoop mode
DP159 includes an I2c-over-AUX to DDC level shifter.