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device-tree document



Whether eDP display card has been registered successfully

If the eDP display card has been created, it would create a sysfs debug directory.

<code>$ ls /sys/class/drm/card0-eDP-1</code>

So you just need to check that directory. If that directory is missing in your machine board, please check:

  • Whether eDP & eDP-PHY have been enabled in DTS files.
  • Whether eDP panel have been registered successfully.
  • Whether you have available VOP module for eDP.
  • Check the kernel log for more detail (dmesg | grep dp)

Check eDP display card status: status, enabled, modes

<code>$ cd /sys/class/drm/card0-eDP-1
$ cat status  # should printed connected or disconnected
$ cat enabled # should printed enabled or disabled
$ cat modes   # should printed the available mode list, like 1536x2048</code>

If you still have no picture on eDP panel, please check bellow information:

  • Check the eDP panel power supply.
  • Check the panel datasheet, ensure you have configured the timing and power sequence rightly.
  • Check the hardware connected status, or test the panel on workable board.