As is usual with new software releases, iOS 27 rollouts have been fraught with problems. One significant issue involves Apple Intelligence storage, occupying roughly 15GB even when not in use, though a workaround exists. However, a more persistent bug affects HDMI output functionality.
Users on Reddit report that iPhones cease external video playback over HDMI once the device is locked. Previously, users could connect to an external display, turn off the phone's screen, and the video stream would continue uninterrupted. This functionality is now broken, though not all apps are affected equally; VLC media player appears to function correctly on a locked screen during testing, unlike YouTube and Netflix.
Investigations reveal iOS 27 now requires apps to explicitly register external display video sessions, a permission previously granted automatically. A temporary workaround involves keeping the screen unlocked and reducing brightness to conserve battery, though this poses challenges for users of AR glasses like the XREAL Air 2. The issue surfaced in September with the iOS 27 release, and the subsequent iOS 27.2 update has not resolved it.
Consequently, developers must update their applications to comply with the new iOS 27 rules regarding external display video permissions.
Source: GSMArena · Summarized by HeadlinesBriefing