beaglebone-black - Flipbook - Page 109
BeagleBone Black
11.5.4
OVERSCAN
Some displays use what is called overscan. This can be seen in TVs and not so much on Monitors. It causes
the image to be missing on the edges, such that you cannot see them displayed. Some higher end displays
allow you to disable overscan.
Most TVs have a mode that allows you to adjust the image. These are options like Normal, Wide, Zoom, or Fit.
Normal seems to be the best option as it does not chop of the edges. The other ones will crop of the edges.
11.5.5
Taking a Nap
In some cases the board can come up in a power down/screen save mode. No display will be present. This is
due to the board believing that it is asleep. To come out of this, you will need to hit the keyboard or move the
mouse.
Once working, the board will time out and go back to sleep again. This can cause the display to go into a power
down mode as well. You may need to turn the display back on again. Sometimes, it may take a minute or so
for the display to catch up and show the image.
11.5.6
AUDIO
Audio will only work on TV resolutions. This is due to the way the speci昀椀cation was written. Some displays have
built in speakers and others require external. Make sure you have a TV resolution and speakers are connected
if they are not built in. The SW should default to a TV resolution giving audio support. The HDMI driver should
default to the highest audio supported resolution.
11.5.7
Getting Help
If you need some up to date troubleshooting techniques, we have a Wiki set up at http://elinux.org/Beagleboard:
BeagleBoneBlack_HDMI
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Chapter 11. Support Information
