Why does the DisplayPort Intel® FPGA Receiver IP Core with "Enable GPU Control" option unchecked fail to acknowledge I2C-over-AUX requests coming from Host DisplayPort Transmitter ?

Due to a problem in the DisplayPort Intel® FPGA Receiver IP core prior to Intel® Quartus® Prime Pro Edition version 18.1 software and prior to Intel® Quartus® Prime Standard Edition version 19.1 software, the DisplayPort Intel® FPGA Receiver IP core may not acknowledge I2C-over-AUX requests coming from Host DisplayPort Transmitter which can cause system black screen scenario.

This problem doesn't affect the DisplayPort Intel® FPGA Receiver IP core with "Enable GPU Control" option checked.

To work around this problem, turn on the "Enable GPU Control" option in the DisplayPort Intel® FPGA Receiver IP Core and use DisplayPort Intel® FPGA Nios II API to manage the AUX channel handshaking.

This problem is fixed beginning with Intel® Quartus® Prime Standard Edition version 19.1 software and Intel® Quartus® Prime Pro Edition version 18.1 software.