This section contains debugging steps for issues with the Sink device.
- Check if the GPU connected is recognizing the streams properly. Read the MSA of all the streams and verify against the GPU data.
- Read the VC Payload table through AXI write and check if the allocated stream IDs are sequential in the slots. The 0th slot is not used and should not contain any of the allocated stream IDs.
- Check the symbol and disparity error counters through AXI reads. If there are a lot of errors, there could be video defects.
- Check with AUX Analyzer to see if all the sideband messages are decoded properly.
- Check the link rate and lane count at which it is trained. Only in 5.4 x 4, four streams of 1080p will be possible. With HBR, only two 1080p streams will be possible. The link rate downshift could be because of training failure—make sure that a DisplayPort v1.2a cable is used.
- Make sure a DisplayPort v1.2a cable is used with DP159 in between.