diff --git a/sys/kern/subr_physmem.c b/sys/kern/subr_physmem.c
--- a/sys/kern/subr_physmem.c
+++ b/sys/kern/subr_physmem.c
@@ -66,8 +66,8 @@
  * with the region.
  */
 #ifdef DEV_ACPI
-#define	MAX_HWCNT	32	/* ACPI needs more regions */
-#define	MAX_EXCNT	32
+#define	MAX_HWCNT	256	/* ACPI needs more regions */
+#define	MAX_EXCNT	256
 #else
 #define	MAX_HWCNT	16
 #define	MAX_EXCNT	16