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DZuck1's avatar
DZuck1
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

DisplayPort Only Connects to Windows not Linux

Hi, I am trying to use the DisplayPort sample design on a Stratix 10 board. I have implemented the exact sample project from Intel with the Bitec daughter card but am seeing some issues. When I plu...
DZuck1's avatar
DZuck1
Icon for Occasional Contributor rankOccasional Contributor
6 years ago
Hi Dlim, I did not have access to the hardware today but will try to get the logs you are asking for tomorrow. As for the setup question. I am using a dual boot PC that boots both into Windows and Linux. The exact same graphics card, DisplayPort cable and Bitec RX port are being used for the test. The only variable here is the OS which is why I am confused why it doesn’t work. The hardware all works with Windows. I will also try to grab the AUX logs and send that to you if that is of any help. Thanks, Daniel
Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
6 years ago

Hi Daniel,

Thanks for the clarification on dual OS boot using same graphic card. That means your hardware setup should be fine and no signal integrity concern.

In this case, I don't think sending debug log to me will be any useful anymore. The most we can prove is graphic card is not sending correct data to DP Rx in Linux OS.

  • DP Rx is just a reception IP. DP Rx cannot control how DP Tx source (graphic card) transmit AUX data to DP Rx.
  • Something is funny happening on Linux OS.

The direct relation that I can think of between graphic card interaction with OS would be graphic card driver.

  • The easiest way will be to either upgrade or downgrade Nvidia Linux OS driver installation and hope that it fix the issue
  • Or the other possibility is you configure different graphic card setting in Linux OS vs Win OS that somehow cause the failure. You may want to cross check the setting between 2 OS.
  • Finally if you had confirmed the graphic card setting used in both OS is the same but video output failure still happened. Then my suggestion is you can raise this issue back to Nvidia to seek their help in understanding graphic card driver difference between Win OS and Linux OS.

Thanks.

Regards,

dlim