If you are reading this, you likely have one of two things in front of you: a vintage Toshiba laptop from the late 2000s (Think Satellite Pro, Tecra, or Portégé series) or a Device Manager screen littered with yellow warning triangles. In the center of that digital crime scene sits a mysterious device labeled simply: Unknown Device with the hardware ID ACPI\TOS620A .
You have probably spent the last hour clicking "Update Driver" only to watch Windows shrug its shoulders. You might have even deleted it, only to watch it reappear like a bad horror movie villain after a reboot. acpi\tos620a
Fix the driver if you want the full, original experience (flickering auto-brightness and all). Disable it if you want peace and quiet. But whatever you do, don't let that yellow exclamation mark haunt your Device Manager forever. If you are reading this, you likely have
If you fix the driver and suddenly hate your laptop's screen behavior, you can turn the feature off in > Change plan settings > Change advanced power settings > Display > Enable adaptive brightness (Set to Off ). The Verdict The ACPI\TOS620A is a relic. It is a testament to an era when laptops were trying to be "smart" before the OS or the hardware was quite ready. If you are running a modern OS on a vintage Toshiba, you are already a hero of the "right to repair" and "legacy computing" movements. You might have even deleted it, only to