I have installed Ubuntu 12.04.3 onto my BBB and have writen a custom GUI with Gtk which I run calling sudo xinit myprogramname. Everything loads and is displaying the data that I want but after 10 minutes the display blanks and eventually turns off.
After some research on the net I have tried various ways and suggestions of disabling the power management without success.
Does anyone have any suggestions? Thanks in advance!
your answer is here ( with more research 
) => https://groups.google.com/forum/#!topic/beagleboard/MdOBsXNXzEI
Thanks for the quick reply. This is one of the sites that I had viewed and tried suggestions from without immediate success. I say immediate because I placed “xset -dpms -display :0” in every X startup file could think of without success. However, once X is started and my application is running I can ssh into the BBB and issue the xset command above and it works as advertised.
Just for information I have tried placing this command in /etc/rc.local, /etc/X11/xinit/xinitrc and /home/ubuntu/.xinitrc without success. I have not tried putting a .xinitrc into root’s home yet.
Might there be any suggestions as to how to script this command?
Thanks,
Dan Metcalf
I found a better solution for me with the xorg.conf
https://wiki.archlinux.org/index.php/Display_Power_Management_Signaling
arch wiki to save the day for another OS again 
Give arch a try on
your BB nothing better than bleeding edge and a true rolling release.
I have not tried Arch yet. I would imagine it is just as easy to install as Angstrom or Ubuntu. If I can’t get this screen to stay on I might have to give it a whirl.
BTW there is no xorg.conf in the Ubuntu distribution. I tried using “X --configure -config xorg.conf -configdir /etc/X11” to have X generate the xorg.conf but it bombs out stating something about the no drivers available.
I will create one the manual way and see if that works.
This will help..
http://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-HDMI
Regards,