Graphical glitch after unlocking device: black overlay resembling multitasking UI #438
Description
Sometimes, right after unlocking the phone, a graphical glitch appears on the screen. A black overlay is visible, which seems to partially correspond to the multitasking / recent apps UI.
Expected behavior
After unlocking the device, the home screen or the previously opened app should be displayed normally, without any visual artifacts.
Actual behavior
A black area appears on the screen immediately after unlocking. It looks like a fragment of the multitasking (recent apps) menu rendered incorrectly or stuck on top of the UI. The rest of the screen content remains visible behind it.
Frequency
Intermittent — does not happen every time, but occurs occasionally when unlocking the device.
Steps to reproduce
Lock the device.
Unlock it (fingerprint or PIN).
In some cases, the graphical glitch appears immediately after unlocking.
Additional information
The issue seems purely graphical.
A screenshot is attached to illustrate the problem.
The black overlay disappears after interacting with the UI (e.g. opening recent apps again or locking/unlocking the device).
Google pixel 9 pro xl
Build GrapheneOs 2025122501