--- a/drivers/pcid/src/main.rs
+++ b/drivers/pcid/src/main.rs
@@ -162,20 +162,32 @@
             | CommandRegister::IO_ENABLE
     });
 
-    // Disable MSI and MSI-X in case a previous driver instance enabled them.
-    for capability in capabilities {
+    // Detect MSI capabilities for logging
+    let has_msix = capabilities.iter().any(|c| matches!(c, PciCapability::MsiX(_)));
+    let has_msi = capabilities.iter().any(|c| matches!(c, PciCapability::Msi(_)));
+
+    // Disable MSI and MSI-X to start from a clean state.
+    // Drivers that support MSI will re-enable it via the pcid scheme interface
+    // using irq_helpers::pci_allocate_interrupt_vector(), which handles
+    // MSI-X -> MSI -> legacy fallback automatically.
+    for capability in capabilities.iter_mut() {
         match capability {
-            PciCapability::Msi(capability) => {
-                capability.set_enabled(false, pcie);
-            }
-            PciCapability::MsiX(capability) => {
-                capability.set_enabled(false, pcie);
-            }
+            PciCapability::Msi(cap) => cap.set_enabled(false, pcie),
+            PciCapability::MsiX(cap) => cap.set_enabled(false, pcie),
             _ => {}
         }
     }
 
-    // Set IRQ line to 9 if not set
+    // Log MSI capability for debugging. Legacy IRQ is still configured as
+    // a baseline — drivers without MSI support (e.g., ahcid) need it.
+    // Drivers with MSI support will switch away from legacy via the scheme interface.
+    if has_msix {
+        info!("    has MSI-X capability (legacy IRQ as fallback)");
+    } else if has_msi {
+        info!("    has MSI capability (legacy IRQ as fallback)");
+    }
+
+    // Legacy IRQ baseline for all devices
     let mut irq = 0xFF;
     let mut interrupt_pin = 0xFF;