Inverted speaker stereo polarity
(04-14-2020, 11:53 AM)zaius Wrote: Although what happens if Pine fixes the hardware? [..]

Manjaro are always in touch with Pine64 and I don't think they'd do such a hardware change without notifying us. 
If they wanted to fix this issue in newer revisions, we would need to have a version indicator (maybe through some sort of hardware e-fuse) or some other thing (like a GPIO state). 
But for now it's good enough with the current solution Smile
I reinstalled Manjaro ARM 20.04 and it is all correctly handled out of the box. So good job and I won't have to reach for the soldering iron any more. Also, Manjaro ARM is going to be the factory OS, so all good for new users too.
I recently received a Pinebook Pro (September 2020), and noticed that my speaker output has the polarity reversed.

The contents of: 
#!/usr/bin/env sh

case "$3" in
                amixer sset Speaker off
                amixer sset 'Playback Polarity' Normal ;;
                amixer sset 'Playback Polarity' 'R Invert'
                amixer sset Speaker on ;;
but when I tried running one of those commands manually I received the following error message:
Unable to find simple control 'Playback Polarity',0

Once I modified the contents of the file to:
#!/usr/bin/env sh

case "$3" in
                amixer -c 0 sset Speaker off
                amixer -c 0 sset 'Playback Polarity' Normal ;;
                amixer -c 0 sset 'Playback Polarity' 'R Invert'
                amixer -c 0 sset Speaker on ;;
It works properly, and my speakers are no longer out of phase.

This is the YouTube video I used to test the polarity:

Possibly Related Threads…
Thread Author Replies Views Last Post
  Fix your Pinebook Pro speaker connection KC9UDX 12 3,564 07-08-2021, 02:10 AM
Last Post: KC9UDX
  PBP Speaker Replacement 8jef 25 15,703 09-09-2020, 05:09 AM
Last Post: speculatrix
  Internal Speaker Modification hmuller 0 916 12-07-2019, 08:51 PM
Last Post: hmuller
  Which sound preference for "hardware" and "speaker" richfm 1 1,363 11-19-2019, 11:45 AM
Last Post: Watercourse

Forum Jump:

Users browsing this thread: 1 Guest(s)