Switch off the HDMI

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With the current Debian we use it is rather easy to switch off the HSMI and thereby freeing a lot of IO-pins for other purposes. Provided you are running the Debian from a SD-card ou can follow these instructions:

First log in as root.

Next change to /boot

]$ cd /boot
]$ vi uEnv.txt

In the uEnv.txt file remove the # before the line starting with cape_disable=...:

##Disable HDMI

Save the file and reboot.

Readout the cape manager settings

[ ✗ root@mybone [~] $]  cat $SLOTS
 0: 54:PF--- 
 1: 55:PF--- 
 2: 56:PF--- 
 3: 57:PF--- 
 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
 5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
 6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN

The missing L in the two lines with HDMI indicates that the Device Tree Overlay is no longer active.