iOS 27 Blocks HDMI Video When iPhone Locks
Apple's new iOS 27 permission rules stop external video playback over HDMI once the iPhone screen is locked, a change first reported in September 2026.
Updated on Nov. 7, 2026 in Artificial Intelligence
Under iOS 27, video streams over HDMI stop when an iPhone's screen is locked, whereas earlier versions kept the stream running after the screen was turned off. Apple introduced a rule requiring apps to explicitly register certain external display video sessions.
Why it matters
The change alters how video plays on external displays for iPhone users who rely on HDMI output. Developers must now update their apps to comply with the new permission rules.
Reported behavior shows VLC continuing HDMI playback on a locked iPhone while YouTube and Netflix stop, and the issue persists in iOS 27.2. Apple has not addressed the cause in the available reports, and the reason for the app-by-app difference is not established.
The players
Apple
Apple is the technology company that develops iOS and its iPhone operating system, including the iOS 27 permission changes.
YouTube
YouTube is Google's video streaming platform, which stops HDMI video playback on a locked iPhone screen under iOS 27.
Netflix
Netflix is a subscription streaming service that, like YouTube, stops HDMI playback when an iPhone screen is locked under iOS 27.
The details
Before iOS 27, the video stream continued over HDMI when the phone's screen was turned off. Apple's new rule requires apps to explicitly register certain external display video sessions, and developers will have to update their apps to match.
Timeline
September 2026: iOS 27 is released and the HDMI issue is first reported.
November 7, 2026: An article on the HDMI output issue is published.
Roadmap
Apple's iOS permission model has long governed how apps access system resources such as external displays. The iOS 27 change moves external video playback from an automatic grant to an explicit, per-app registration requirement.
iPhone users who stream video to an HDMI display will find playback stops when the screen locks in iOS 27, which may affect presentations or long viewing sessions. Developers must update apps to register external display sessions, and until they do, some apps may behave differently from others.
The takeaway
Users who depend on HDMI output should keep the screen unlocked or choose an app that continues playback. Checking app updates after installing iOS 27 can clarify which services are affected.
Further reading
For related coverage of how Apple's platform decisions shape software behavior, see Artificial Intelligence.
Source note: This article includes information reported by GSM Arena.
