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Affected Platforms: Precision 7680 Precision 7780 Symptoms: The High Definition Audio Controller shows error code 55 in the device manager. Figure 1: (English Only) Error code 55 in Device Manager There is no audio using an external monitor connected to the computer due to the driver being in an error state.
A combination of settings causes this issue: Enable Pre-Boot DMA Support and Enable OS Kernel DMA Support being enabled in the BIOS. The Group Policy Object: Enumeration policy for external devices incompatible with Kernel DMA Protection is enabled. Enumeration Policy is set to Only while logged in (default) or block all . When these settings are configured this way, it causes error code 55 with the High Definition Audio Controller as it does not contain DMA remapping.
The issue can be resolved by updating to BIOS v1.12.2 or later from Drivers & Downloads of the computer product page. Precision 7680 Precision 7780 After updating the BIOS, you must enable Internal Port DMA Compatibility Mode under the Virtualization Section of the BIOS.
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