diff --git a/kernel/src/ACPI/AcpiDevices.cpp b/kernel/src/ACPI/AcpiDevices.cpp
index 797c97b..82e8089 100644
--- a/kernel/src/ACPI/AcpiDevices.cpp
+++ b/kernel/src/ACPI/AcpiDevices.cpp
@@ -22,7 +22,22 @@ namespace Hal {
 
         // ============================================================================
         // ACPI encodes PNP IDs as compressed 32-bit EISAIDs.
+        static constexpr uint32_t ByteSwap32(uint32_t value) {
+            return ((value & 0x000000FFu) << 24) |
+                   ((value & 0x0000FF00u) <<  8) |
+                   ((value & 0x00FF0000u) >>  8) |
+                   ((value & 0xFF000000u) >> 24);
+        }
+
+        static_assert(ByteSwap32(0x0301D041u) == 0x41D00103u); // PNP0103
+        static_assert(ByteSwap32(0x090CD041u) == 0x41D00C09u); // PNP0C09
+
         static void DecodeEisaId(uint32_t id, char* out) {
+            // AML exposes the EISAID integer in little-endian byte order, while
+            // the compressed manufacturer and product fields are defined in
+            // display order. Convert it before extracting either field.
+            id = ByteSwap32(id);
+
             // EISA ID encoding:
             // Bits 31-16: 3 compressed letters (5 bits each, '@' based)
             // Bits 15-0:  4 hex digits (product number)