diff --git a/hw/pt-graphics.c b/hw/pt-graphics.c
index fec7390..17ce8c0 100644
--- a/hw/pt-graphics.c
+++ b/hw/pt-graphics.c
@@ -74,6 +74,9 @@ uint32_t igd_pci_read(PCIDevice *pci_dev, uint32_t config_addr, int len)
     {
         case 0x00:        /* vendor id */
         case 0x02:        /* device id */
+        case 0x08:        /* revision id */
+        case 0x2c:        /* sybsystem vendor id */
+        case 0x2e:        /* sybsystem id */
         case 0x50:        /* SNB: processor graphics control register */
         case 0x52:        /* processor graphics control register */
         case 0xa0:        /* top of memory */