HDMI not working

Products Support DragonBoard410c
#1

I am using 410c board and following the instruction to hook the hdmi-dvi cable to my monitor (powered on), then power on the 410C, there is not video signal show on the monitor. I have tried 2 monitors, one is HP z24i (1920X1200) and one Viewsonic va2323WM (1920X1080). Both of them don’t show anything. Ipress the power button on the 410c, still nothing. I tried the hdmi-dvi cable with my laptop, the monitors are fine and show my loaptop screen…

I hooked the 410C to my HDTV through hdmi-hdmi cable, the TV shows the android screen.

What is the problem? the 410C is just out of box and I haven’t change any image/software.

Hope to get some help from the site. Thank you.

G.

#2

It appears that a direct HDMI connection is necessary, even thought doc on the 96Boards site for the 410c says “HDMI capable monitor is recommended”. My monitor has a DVI input, so I used an HDMI to DVI adapter, but the monitor kept flashing the message “Cannot display this video mode”. Plugged the HDMI cable from the 410c into an HDMI port on a different monitor and it worked.

#3

Thanks a lot for the information. Will we have the fix for this?

G.

#4

AFAIK Android for DB410C doesn’t support any kind of monitor detection, instead it is hard coded to produce video at 1920x1080p60 and to use HDMI protocol (DVI-D protocol is similar but different enough to confuse some monitors). I’m not aware of any plans to fix this. It is probably possible to recompile the Android kernel with a few extra register pokes to force the ADV7533 chip into DVI-D mode but for now I’m afraid that is an “exercise for the reader”.

Having said that please be aware that Debian for DB410C uses a different display stack (based on Freeduino). This alternative display stack has comprehensive support for monitor detection and supports a much wider range of display devices.