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HP Compaq/EliteBook/ProBook Notebook PCs - Unknown Device in Device Manager with Description "ACPI\IFX0102\4&28738126&0"


Device Manager reports an unknown device with description ACPI\IFX0102\4&28738126&0 in Microsoft Windows XP.


To resolve this issue, perform the following steps:

  1. Log on to the HP website.

    Click here to access the HP website at

  2. Download the latest HP Embedded Security for ProtectTools and Infineon TPM Driver.

  3. Once the driver is installed, the unknown device message should not reflect.

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