2 files changed, 8 insertions, 25 deletions
diff --git a/source/components/hardware/hwsleep.c b/source/components/hardware/hwsleep.c
index 1953ff846e80..1957fbdf2764 100644
--- a/source/components/hardware/hwsleep.c
+++ b/source/components/hardware/hwsleep.c
@@ -99,20 +99,6 @@ AcpiHwLegacySleep (
         return_ACPI_STATUS (Status);
     }
 
-    if (SleepState != ACPI_STATE_S5)
-    {
-        /*
-         * Disable BM arbitration. This feature is contained within an
-         * optional register (PM2 Control), so ignore a BAD_ADDRESS
-         * exception.
-         */
-        Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 1);
-        if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS))
-        {
-            return_ACPI_STATUS (Status);
-        }
-    }
-
     /*
      * 1) Disable/Clear all GPEs
      * 2) Enable all wakeup GPEs
@@ -380,17 +366,6 @@ AcpiHwLegacyWake (
             AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId,
             ACPI_CLEAR_STATUS);
 
-    /*
-     * Enable BM arbitration. This feature is contained within an
-     * optional register (PM2 Control), so ignore a BAD_ADDRESS
-     * exception.
-     */
-    Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 0);
-    if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS))
-    {
-        return_ACPI_STATUS (Status);
-    }
-
     AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING);
     return_ACPI_STATUS (Status);
 }
diff --git a/source/components/hardware/hwxfsleep.c b/source/components/hardware/hwxfsleep.c
index b7cbbc813e65..caa51a8a4a62 100644
--- a/source/components/hardware/hwxfsleep.c
+++ b/source/components/hardware/hwxfsleep.c
@@ -101,6 +101,14 @@ AcpiSetFirmwareWakingVector (
     ACPI_FUNCTION_TRACE (AcpiSetFirmwareWakingVector);
 
 
+    /*
+     * According to the ACPI specification 2.0c and later, the 64-bit
+     * waking vector should be cleared and the 32-bit waking vector should
+     * be used, unless we want the wake-up code to be called by the BIOS in
+     * Protected Mode. Some systems (for example HP dv5-1004nr) are known
+     * to fail to resume if the 64-bit vector is used.
+     */
+
     /* Set the 32-bit vector */
 
     AcpiGbl_FACS->FirmwareWakingVector = PhysicalAddress;