Disabling HDMI kills WiFi

[Brent H Horine]

Eventually I want to use PRU and want to disable HDMI to have more inputs available. I setup WiFi and verify it works. In /boot/uEnv.txt, I uncomment 

  ##BeagleBone Black: HDMI (Audio/Video) disabled:

  dtb=am335x-boneblack-emmc-overlay.dtb

and reboot. 

Once back in I try to ping my server and get the response: "connect: Network is unreachable". Trying to use "sudo connmanctl" gives all sorts of complaints such as 'Method "Scan" with signature "" on interface "net.connman.technology" doesn't exist'. Re-commenting the dtb line and rebooting allows WiFi operation again (without even need to go through connmanctl again).

Is there a way to disable the HDMI while retaining WiFi?

Output of uname -a

Linux beaglebone 4.4.54-ti-r93 #1 SMP Fri Mar 17 13:08:22 UTC 2017 armv7l GNU/Linux

[Robert Nelson]

This has to be done with u-boot overlays:

http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays

enable_uboot_overlays=1
disable_uboot_overlay_video=1

Regards,

--
Robert Nelson
https://rcn-ee.com/

[Brent H Horine]

Thanks! That worked.