diff --git a/drivers/bus/acpi/acpica/dispatcher/dsfield.c b/drivers/bus/acpi/acpica/dispatcher/dsfield.c
index b2a29c969a8..e2a08bb0a24 100644
--- a/drivers/bus/acpi/acpica/dispatcher/dsfield.c
+++ b/drivers/bus/acpi/acpica/dispatcher/dsfield.c
@@ -233,7 +233,12 @@ AcpiDsCreateBufferField (
         Status = AcpiNsLookup (WalkState->ScopeInfo,
             Arg->Common.Value.String, ACPI_TYPE_ANY,
             ACPI_IMODE_LOAD_PASS1, Flags, WalkState, &Node);
-        if (ACPI_FAILURE (Status))
+        if ((WalkState->ParseFlags & ACPI_PARSE_DISASSEMBLE) &&
+            Status == AE_ALREADY_EXISTS)
+        {
+            Status = AE_OK;
+        }
+        else if (ACPI_FAILURE (Status))
         {
             ACPI_ERROR_NAMESPACE (WalkState->ScopeInfo,
                 Arg->Common.Value.String, Status);
@@ -574,12 +579,21 @@ AcpiDsCreateField (
     Info.RegionNode = RegionNode;
 
     Status = AcpiDsGetFieldNames (&Info, WalkState, Arg->Common.Next);
-    if (Info.RegionNode->Object->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM &&
-        !(RegionNode->Object->Field.InternalPccBuffer
-        = ACPI_ALLOCATE_ZEROED(Info.RegionNode->Object->Region.Length)))
+    if (ACPI_FAILURE (Status))
     {
-        return_ACPI_STATUS (AE_NO_MEMORY);
+        return_ACPI_STATUS (Status);
     }
+
+    if (Info.RegionNode->Object->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM)
+    {
+        RegionNode->Object->Field.InternalPccBuffer =
+            ACPI_ALLOCATE_ZEROED(Info.RegionNode->Object->Region.Length);
+        if (!RegionNode->Object->Field.InternalPccBuffer)
+        {
+            return_ACPI_STATUS (AE_NO_MEMORY);
+        }
+    }
+
     return_ACPI_STATUS (Status);
 }
 
diff --git a/drivers/bus/acpi/acpica/executer/exfield.c b/drivers/bus/acpi/acpica/executer/exfield.c
index e20645698b3..3f7c560d286 100644
--- a/drivers/bus/acpi/acpica/executer/exfield.c
+++ b/drivers/bus/acpi/acpica/executer/exfield.c
@@ -59,7 +59,7 @@
 #define ACPI_INVALID_PROTOCOL_ID        0x80
 #define ACPI_MAX_PROTOCOL_ID            0x0F
 
-const UINT8     AcpiProtocolLengths[] =
+static const UINT8      AcpiProtocolLengths[] =
 {
     ACPI_INVALID_PROTOCOL_ID,   /* 0 - reserved */
     ACPI_INVALID_PROTOCOL_ID,   /* 1 - reserved */
diff --git a/drivers/bus/acpi/acpica/include/acglobal.h b/drivers/bus/acpi/acpica/include/acglobal.h
index 37a95b1557c..806fa43d990 100644
--- a/drivers/bus/acpi/acpica/include/acglobal.h
+++ b/drivers/bus/acpi/acpica/include/acglobal.h
@@ -328,6 +328,7 @@ ACPI_GLOBAL (ACPI_EXTERNAL_FILE *,      AcpiGbl_ExternalFileList);
 #ifdef ACPI_DEBUGGER
 ACPI_INIT_GLOBAL (BOOLEAN,              AcpiGbl_AbortMethod, FALSE);
 ACPI_INIT_GLOBAL (ACPI_THREAD_ID,       AcpiGbl_DbThreadId, ACPI_INVALID_THREAD_ID);
+ACPI_INIT_GLOBAL (UINT32,               AcpiGbl_NextCmdNum, 1);
 
 ACPI_GLOBAL (BOOLEAN,                   AcpiGbl_DbOpt_NoIniMethods);
 ACPI_GLOBAL (BOOLEAN,                   AcpiGbl_DbOpt_NoRegionSupport);
diff --git a/drivers/bus/acpi/acpica/include/acpixf.h b/drivers/bus/acpi/acpica/include/acpixf.h
index d3503841c27..c371ccd8ad8 100644
--- a/drivers/bus/acpi/acpica/include/acpixf.h
+++ b/drivers/bus/acpi/acpica/include/acpixf.h
@@ -46,7 +46,7 @@
 
 /* Current ACPICA subsystem version in YYYYMMDD format */
 
-#define ACPI_CA_VERSION                 0x20200326
+#define ACPI_CA_VERSION                 0x20200430
 
 #include "acconfig.h"
 #include "actypes.h"
diff --git a/drivers/bus/acpi/acpica/include/acpredef.h b/drivers/bus/acpi/acpica/include/acpredef.h
index d6dd67926ea..2b6173d6c9f 100644
--- a/drivers/bus/acpi/acpica/include/acpredef.h
+++ b/drivers/bus/acpi/acpica/include/acpredef.h
@@ -661,10 +661,10 @@ const ACPI_PREDEFINED_INFO          AcpiGbl_PredefinedMethods[] =
     {{"_NIC",   METHOD_0ARGS,                          /* ACPI 6.3 */
                 METHOD_RETURNS (ACPI_RTYPE_BUFFER)}},
 
-    {{"_NIG",   METHOD_1ARGS (ACPI_TYPE_BUFFER),       /* ACPI 6.3 */
+    {{"_NIG",   METHOD_0ARGS,                          /* ACPI 6.3 */
                 METHOD_RETURNS (ACPI_RTYPE_BUFFER)}},
 
-    {{"_NIH",   METHOD_0ARGS,                          /* ACPI 6.3 */
+    {{"_NIH",   METHOD_1ARGS (ACPI_TYPE_BUFFER),       /* ACPI 6.3 */
                 METHOD_RETURNS (ACPI_RTYPE_BUFFER)}},
 
     {{"_NTT",   METHOD_0ARGS,
diff --git a/media/doc/3rd Party Files.txt b/media/doc/3rd Party Files.txt
index 6404f8a77ef..cdf713041c8 100644
--- a/media/doc/3rd Party Files.txt	
+++ b/media/doc/3rd Party Files.txt	
@@ -92,7 +92,7 @@ Used Version: 1.6.37
 Website: http://libpng.sourceforge.net/
 
 Title: ACPICA
-Used Version: 20200326
+Used Version: 20200430
 Website: https://acpica.org/
 
 Title: Schily Tools, mkisofs