I'm trying to bring up a custom designed board based on the Solid-Run Hummingbird Edge. Unfortunately I have encountered some issues with HDMI.
With the original HB EDGE I can see everything on the screen after powering on the board. With my board the display is blank until linux boots up, then all is fine. However if I unplug the HDMI conenctor, after plugging back the display remains blank. I have to restart the board to have anything on the screen again.
dmesg shows the followings (when replugging)
56.840202] mxc_hdmi 20e0000.hdmi_video: same edid
[ 56.840300] mxc_hdmi 20e0000.hdmi_video: mxc_hdmi_cable_connected reports HDMI mode
Is there any idea what could be the problem ?
When designing the board I've tried to calculate impedances / route the traces according to the HDMI standards. The length of the traces are around 22mm, +/- 0.2mm each.