2015-11-26 20:24:44 +00:00
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## HDMI audio
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To enable audio over HDMI, add the following to your asound.conf:
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```
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pcm.!default {
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type hw
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card 0
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}
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ctl.!default {
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type hw
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card 0
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}
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2017-02-25 23:13:34 +00:00
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```
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## LEDs
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ODROIDs have dual LEDs: a red power LED which is always on if power is
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supplied, and a blue LED which can be configured.
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By default, the blue LED is a heartbeat LED, which flashes when the kernel is
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running. This can be configured in `/sys/class/leds/led1/trigger`.
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To list available triggers:
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# cat /sys/class/leds/blue:heartbeat/trigger
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Replace TRIGGER with one of the available triggers. This setting will apply
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instantly, but be lost upon reboot.
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# echo TRIGGER > /sys/class/leds/blue:heartbeat/trigger
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To create a persistent configuration, edit or create
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`/etc/tmpfiles.d/leds.conf`:
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w /sys/class/leds/blue:heartbeat/trigger - - - - TRIGGER
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