The issue typically comes down to how the iPad negotiates USB-C accessory roles and protocols — specifically, whether the adapter properly supports USB-C Digital Audio Accessory (DAA) mode and whether it communicates power delivery (PD) simultaneously. Not all USB-C multiport adapters are created equal, and many third-party ones don't fully comply with Apple's expectations for audio passthrough. Even Apple's own USB-C Digital AV Multiport Adapter doesn’t support analog audio — it only supports HDMI and power, for instance.
Some things to consider:
- Stick with MFi-certified or Apple-recommended adapters. If you haven’t already, try the Belkin USB-C Audio + Charge RockStar — AFAIK, it’s one of the few officially supported adapters that consistently works with iPads for both charging and headphone jack output.
- Use USB-C digital headphones instead of 3.5mm. If you're using an adapter that has a 3.5mm headphone jack, and the iPad doesn’t detect it properly, it might be better to switch to a USB-C headset or dongle that uses digital audio. Analog-to-digital conversion isn't always supported through third-party hubs.
- If you’re stacking a USB-C hub + headphone dongle + charger, this often introduces handshake confusion with the iPad. Try using a single adapter that combines both functions and is known to work with iPadOS.
- Plug in audio first, then power. With some adapters, if you connect power first, the iPad prioritizes charging and fails to activate the audio output. Try plugging in the headphone side first, then connect the charger.
- In cases where it just won’t switch to headphones, a restart with the dongle already connected can sometimes force the iPad to properly initialize the accessory.
