As is usually the case with new software releases, rollouts rarely go smoothly, and developers work overtime to provide fixes. One problem that gained a lot of traction is the Apple Intelligence storage issue that occupies about 15GB in some cases, even if you don’t use AI or it’s not available at all in your country. At least there’s a workaround that seems to work until Apple addresses it. The same cannot be said about this annoying bug causing problems with the HDMI output.
Numerous users on Reddit report that their iPhones stop external video playback over HDMI once the device is locked. Up until now, you could connect your iPhone to an external display, turn off the phone’s screen, and the video stream would continue. This is no longer the case, though.
Interestingly enough, not all apps are having trouble with HDMI out on a locked screen. VLC, for example, seems to work perfectly fine, as per our tests in the office. We were able to replicate the issue in YouTube and Netflix, but iPhone owners say other apps are affected as well.
With a little bit of digging, we found that Apple introduced a new “rule” with iOS 27, requiring apps to explicitly register certain external display video sessions. Before, iOS would provide the permission automatically.
The temporary solution, which is hardly a solution at all, is to keep the screen unlocked at all times and maybe reduce the brightness to preserve the battery. But then you will have to be careful not to touch the display, which is going to be a challenge if you are using AR glasses like the XREAL Air 2, for example.
The issue was first reported in September along with the iOS 27 release, but the latest iOS 27.2 version doesn’t seem to address it. Then again, one would argue that this isn’t a “bug” in the sense that Apple just changed how permissions work when playing videos on an external display. This might explain why VLC seems to work perfectly fine on a locked screen. This means developers will have to step in and update their apps in accordance with the new iOS 27 rules.
