Error configuring DSS2 (Permission Denied)

I am trying to get the S-Video output to work. I've found some
seemingly relevant documentation here:

I see all the files it talks about in the sysfs section, but when I
try to modify them, as in the examples, I get a "Permissions Denied"

/$ echo "0" > /sys/devices/platform/omapdss/overlay0/enabled
-bash: /sys/devices/platform/omapdss/overlay0/enabled: Permission

Trying again with sudo does not change the results. Is there some
command I have to send to unlock this interface? Does anyone have a
better explanation on how to change the video settings?

My distribution: Angstrom-Beagleboard-demo-image-glibc-ipk-2010.3-

My kernel: uImage-2.6.32-

I’ve run into a similar (or the same) problem before. How are you using sudo? If you use:
sudo echo “0” > /sys/dev…
then only the echo command will be executed as sudo; the insert (">" command) will execute as your normal user.
If you switch to the superuser it should work:
sudo su
echo “0” > /sys/dev…
or you can execute the whole thing as sudo (I think this works):
sudo echo "0" > /sys/dev...
(note the backticks ^^^^ )

If you would like to use this device as a normal user, you should also be able to chmod the device “file” in sysfs to change the owner or group to your normal user. Then execute whatever you need to as your normal user.

GL;HTH (good luck; hope this helps).
– @