diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index bca9e85daaa5..8e65dbdd61c6 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -512,14 +512,22 @@ static void sb600_disable_hpet_bar(struct pci_dev *dev)
 	 */
 
 	pci_read_config_byte(dev, 0x08, &val);
+	dev_info(&dev->dev, "cfg 0x08: %#02x\n", val);
 
 	if (val < 0x2F) {
+		dev_info(&dev->dev, "disabling BAR 1 (HPET address)\n");
 		outb(0x55, 0xCD6);
 		val = inb(0xCD7);
+		dev_info(&dev->dev, "PM  0x55: %#02x\n", val);
 
 		/* Set bit 7 in PM register 0x55 */
 		outb(0x55, 0xCD6);
 		outb(val | 0x80, 0xCD7);
+		dev_info(&dev->dev, "PM  0x55: wrote %#02x\n", val | 0x80);
+
+		outb(0x55, 0xCD6);
+		val = inb(0xCD7);
+		dev_info(&dev->dev, "PM  0x55: %#02x\n", val);
 	}
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);