On Du, 03 mai 20, 17:38:59, Ken Heard wrote: > > The next series of tests involves connecting the two HDMI cables I have > between the laptop and the monitor. Both have standard size plugs at each > end. On is a cheap 3 metre one; the other is 5 metres long and of a higher > quality. For these tests each cable was plugged successively to both jacks > in the monitor, and both cables were tried in each direction between the > laptop and the monitor. > > I first disconnected the amplifier from the monitor and listened on the buds > plugged into the monitor 3.5 mm headphones jack. I repeated these tests > with the amplifier connected by a fibre optic cable to the monitor. > > The result for all the tests described in the last two paragraphs was the > same. In every case there was sound from only one channel. (I also made > sure that each speaker could work if plugged into the right speaker jacks. > They both did.)
The digital audio signal via HDMI is "combined" with the video signal. In order to separate it (e.g. to feed an amplifier directly) one needs special signal "splitter" devices. Because of this I believe it is highly unlikely for the problem to be connection related (unlike analog connections). You should probably carefully check all possible sound settings on both the laptop and the monitor. At least for the laptop the HDMI (digital) output is different than the headset (analog) output. Could be similar also for the monitor. On the laptop you have to check both alsa and pulseaudio (if used) settings. Do make sure you test with the same sound playing program to eliminate another possible source of issues (music players usually have their own volume/panning controls). Another possible method to eliminate software configuration issues would be to boot from a live image. Hope this helps, Andrei -- http://wiki.debian.org/FAQsFromDebianUser
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