User Manual

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11.4.3 OUT OF SEQUENCE

Sometimes the display and the board can get confused. One way to prevent this is after

everything is cabled up and running, you can power cycle the display, with the board still

running. You can also try resetting the board and let it reboot to resync with the TV.

11.4.4 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.

11.4.5 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 some 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.

11.4.6 AUDIO

Audio will only work on TV resolutions. This is due to the fact that is the way the

specification 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.

11.4.7 Getting Help

If you need some up to date troubleshooting techniques, we have a Wiki set up at

http://elinux.org/Beagleboard:BeagleBoneBlack_HDMI