AnsweredAssumed Answered

HDMI Issue

Question asked by Gabor Kurucz on Apr 12, 2018
Latest reply on Apr 12, 2018 by igorpadykov

Hi,

 

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. 

 


Thanks

Outcomes