Acpi Ifx0102 -

If you’ve ever dug through Windows Device Manager on an older laptop (especially an Acer, Lenovo, or Sony Vaio from the late 2000s), you might have spotted a cryptic entry under “System devices”: ACPI IFX0102 It has no obvious driver, a generic Microsoft driver sometimes attaches itself, and it occasionally sits there with a yellow exclamation mark. Most people ignore it. But what is it? A phantom chip? A relic of a forgotten security standard? A backdoor?

Reboot → Security tab → Look for “TPM Security” or “Security Chip” → Enable/Disable. Conclusion: A Fossil of the Trusted Computing Era The ACPI IFX0102 isn’t malware, a phantom device, or an error. It’s a 1.2 Trusted Platform Module from Infineon, buried in the ACPI tables of late-2000s laptops. For its time, it was cutting-edge — hardware root of trust for BitLocker and measured boot. Today, it’s a legacy component: too slow for modern security demands, vulnerable to ROCA if unpatched, and excluded from Windows 11 entirely.

PNP0C31 is the official Plug-and-Play ID for a TPM. So IFX0102 is Infineon’s vendor-specific HID, while PNP0C31 is the generic class ID. acpi ifx0102

Device (TPM)

dmesg | grep -i tpm ls /dev/tpm* sudo tpm_version If you see TPM 1.2, Infineon , that’s your IFX0102. If you’ve ever dug through Windows Device Manager

So, ACPI IFX0102 = chip attached via the LPC bus and exposed through ACPI firmware. 2. What It Actually Is: TPM 1.2 The IFX0102 is a TPM (Trusted Platform Module) 1.2 device, typically the Infineon SLB 9635 TT 1.2 or similar.

Name (_HID, "IFX0102") Name (_CID, "PNP0C31") // TPM 1.2 Compatibility ID Name (_UID, 1) Method (_STA, 0, NotSerialized) Return (0x0F) A phantom chip

Because on many systems (especially Acer, Gateway, eMachines, Packard Bell — all using similar InsydeH2O or Phoenix BIOSes), the TPM wasn’t directly enumerated by PCI or PNP. Instead, the BIOS’s ACPI namespace contained a device definition like: