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controller: leave a usable terminal when stopping the desktop
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Stopping the display manager left the Pi's monitor black with only a blinking
cursor. The console VT is already in the foreground with a getty and a live
shell on it (verified: /dev/vcs1 holds the login banner and prompt) — the
display manager just hands the display back without the console being
repainted, so nothing is visible.

Activate the console VT, then bounce off another VT to force a modeset and
redraw, and print a short message telling the user the Controller stopped the
desktop and how to start it again.

Best-effort throughout: skipped when no getty is on the console VT, a chvt or
console-write failure never fails the stop, and being stranded on the repaint
VT is reported rather than claimed as success. Verified on 10.0.0.8 hardware.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Roland 2026-07-29 15:54:18 -06:00
parent ab5f416b3f
commit a0fa03e6c5
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controller/api/schemas.py
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@ -233,6 +233,8 @@ class DesktopActionResponse(BaseModel):
"""Response model for desktop start/stop actions."""
success: bool = Field(description="Whether the action succeeded")
switched_to_console: Optional[bool] = Field(
default=None, description="Whether stopping switched the display to a console terminal")
error: Optional[str] = Field(default=None, description="Error message if failed")