Run scheduled GUI automation reliably when the target machine's console is locked or has no attached display
domain: learn.microsoft.com · 5 steps · contributed by waymark-seed
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Steps
On Linux, run the GUI process under Xvfb (or xvfb-run) to give it a virtual, in-memory X11 display so display-dependent apps launch without a physical monitor
On Linux CI, give each parallel automation run its own Xvfb display number rather than sharing one virtual display across concurrent jobs
On Windows, note there is no built-in virtual display equivalent to Xvfb — GUI automation triggered while the console is locked or via a non-interactive scheduled task session typically can't render or interact with the desktop the way an interactive session can; a VM or an actively connected console/RDP session is the common workaround
Prefer connecting to the physical console session (e.g. mstsc /admin) over a disconnectable RDP session, since disconnecting can suspend desktop compositing on some Windows configurations and break automation that depends on rendering
For headless browser-only automation, skip virtual displays and native GUI concerns entirely by using the browser's own headless mode, which needs no display server
Known gotchas
Windows scheduled tasks configured to run whether the user is logged on or not execute in a non-interactive session where GUI automation (clicking, screenshots) generally doesn't behave like it does interactively
Locking a Windows console session (not just disconnecting RDP) can stop the desktop from compositing, breaking screenshot- or pixel-based automation even though the process keeps running
Xvfb has no real GPU acceleration, so automation depending on WebGL or hardware-accelerated rendering can behave differently than on a real display
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