iOS 27 Bug: HDMI Video Streaming Fails When Screen Is Locked

A New Restriction or a Software Bug?

Since the release of iOS 27, some Apple users have encountered an unusual problem regarding video streaming to external displays via HDMI. Previously, iPhone users could connect their devices to a monitor or television, lock the screen, and continue streaming video without interruption. However, following the latest update, the video feed cuts out as soon as the device is locked.

It is worth noting that this issue does not affect all applications. For instance, the VLC player continues to function as expected, whereas users encounter interruptions with apps like YouTube and Netflix. This suggests that the issue may not be a technical bug, but rather a change in software policy implemented by Apple.

What Has Changed at the System Level?

Research indicates that iOS 27 has introduced a new regulation requiring applications to register video sessions with external displays independently. Previously, the system granted this permission automatically, which simplified the process. It is likely that developers must now adapt their applications to these new standards to allow video streaming to continue even after the screen is locked.

Currently, the only workaround is to keep the screen active at all times. Users can reduce screen brightness to a minimum to save battery life, though this remains an inconvenient method. This issue is particularly problematic for those using an iPhone with AR glasses, such as the XREAL Air 2, where accidental touches on the phone screen are unavoidable.

What Awaits Users?

This issue was first identified in September upon the release of iOS 27, yet the subsequent iOS 27.2 update has failed to resolve it. Apple has not yet issued an official statement on the matter, leading many to believe that this change was intentional.

For users who actively use their iPhones to display multimedia content on external screens, this change creates significant discomfort. Until app developers release updates to comply with the new system rules, users must accept that their phone screen must remain on while watching videos. There remains hope that developers will find a way to restore the original user experience in the near future.