Talk:PinePhone Hardware Issues

Evidence for/against the shim U101 fix

Works for me 2024-11-06

I shimmed my U101 per the advice given here. Based on two days of a small handful of tests, and after having earlier had a variety of audio and non-audio bugs on my PinePhone v1.2b running Mobian/trixie, including this difficult-to-reproduce bug, my microphone appears to be working. I now have out-of-the-box alsa-ucm-conf 1.2.12-1mobian1 and other packages at the Mobian default, with modem: FLOSS firmware 0.7.2 + ADSP 30.006.30.006. Boud (talk) 13:49, 6 October 2024 (UTC)

Speculation about why the shim U101 fix may work

Any proper explanations? Some hypotheses include:

• electrical isolation/contacts:
  • the shim improves an electrical contact that was too weak (not contacting properly); or
  • prevents some weak electrical contact that causes current to go in the wrong direction.
• sound wave air transmission:
  • the shim pushes the microphone slight higher above the back of the phone in order to better match the hole in the chassis.

Boud (talk) 13:49, 6 October 2024 (UTC)

I've updated the above list based on a matrix chat favouring "improving an electrical contact". Boud (talk) 17:52, 8 October 2024 (UTC)