diff --git a/doc/busses/i2c-ali15x3 b/doc/busses/i2c-ali15x3
index 60b71908..333059e7 100644
--- a/doc/busses/i2c-ali15x3
+++ b/doc/busses/i2c-ali15x3
@@ -85,8 +85,7 @@ ACPI-compliant Power Management Unit (PMU).
 The whole 7101 device has to be enabled for the SMB to work.
 You can't just enable the SMB alone.
 The SMB and the ACPI have separate I/O spaces.
-So we have to make sure that both the SMB and the ACPI
-are mapped and enabled.
+We make sure that the SMB is enabled. We leave the ACPI alone.
 
 
 Features
@@ -98,11 +97,8 @@ This driver does not use interrupts.
 
 Issues
 ------
-This driver requests the I/O space both for the SMB and the ACPI
-registers, just to be safe. It doesn't actually use the ACPI region.
-It will therefore conflict with separate software
-that accesses the ACPI registers?
-To fix this, undefine MAP_ACPI.
+This driver requests the I/O space for only the SMB
+registers. It doesn't use the ACPI region.
 
 On the ASUS P5A motherboard, there are several reports that
 the SMBus will hang
diff --git a/kernel/busses/i2c-ali15x3.c b/kernel/busses/i2c-ali15x3.c
index 9de8d14b..8ca58c92 100644
--- a/kernel/busses/i2c-ali15x3.c
+++ b/kernel/busses/i2c-ali15x3.c
@@ -50,18 +50,11 @@
     The whole 7101 device has to be enabled for the SMB to work.
     You can't just enable the SMB alone.
     The SMB and the ACPI have separate I/O spaces.
-    So we have to make sure that both the SMB and the ACPI
-    are mapped and enabled.
+    We make sure that the SMB is enabled. We leave the ACPI alone.
 
     This driver controls the SMB Host only.
     The SMB Slave controller on the M15X3 is not enabled.
 
-    This driver requests the I/O space both for the SMB and the ACPI
-    registers, just to be safe. It doesn't actually use the ACPI region.
-    It will therefore conflict with separate software
-    that accesses the ACPI registers?
-    To fix this, undefine MAP_ACPI.
-
     This driver does not use interrupts.
 */
 
@@ -89,10 +82,6 @@
 #define __initdata 
 #endif
 
-/* undefine this if separate ACPI software is accessing the
-   registers at the offset defined at 0x10.
-*/
-#define MAP_ACPI 1
 #undef FORCE_ALI15X3_ENABLE
 
 /* ALI15X3 SMBus address offsets */
@@ -107,7 +96,6 @@
 
 /* PCI Address Constants */
 #define SMBCOM    0x004 
-#define ACPIBA     0x010
 #define SMBBA     0x014
 #define SMBATPC   0x05B		/* used to unlock xxxBA registers */
 #define SMBHSTCFG 0x0E0
@@ -117,14 +105,12 @@
 
 /* Other settings */
 #define MAX_TIMEOUT 500		/* times 1/100 sec */
-#define ALI15X3_ACPI_IOSIZE 64
 #define ALI15X3_SMB_IOSIZE 32
 
 /* this is what the Award 1004 BIOS sets them to on a ASUS P5A MB.
    We don't use these here. If the bases aren't set to some value we
    tell user to upgrade BIOS and we fail.
 */
-#define ALI15X3_ACPI_DEFAULTBASE 0xEC00
 #define ALI15X3_SMB_DEFAULTBASE 0xE800
 
 /* ALI15X3 address lock bits */
@@ -195,9 +181,6 @@ static struct i2c_adapter ali15x3_adapter = {
 };
 
 static int __initdata ali15x3_initialized;
-#ifdef MAP_ACPI
-static unsigned short ali15x3_acpia = 0;
-#endif
 static unsigned short ali15x3_smba = 0;
 
 
@@ -243,7 +226,7 @@ int ali15x3_setup(void)
   } 
 
 /* Check the following things:
-	- ACPI and SMB I/O addresses are initialized
+	- SMB I/O address is initialized
 	- Device is enabled
 	- We can use the addresses
 */
@@ -262,17 +245,7 @@ int ali15x3_setup(void)
                                  SMBATPC, temp);
   }
 
-/* Determine the address of the ACPI and SMBus areas */
-#ifdef MAP_ACPI
-  pci_read_config_word_united(ALI15X3_dev, ALI15X3_bus ,ALI15X3_devfn,
-                              ACPIBA,&ali15x3_acpia);
-  ali15x3_acpia &= (0xffff & ~ (ALI15X3_ACPI_IOSIZE - 1));
-  if(ali15x3_acpia == 0) {
-    printk("i2c-ali15x3.o: ALI15X3_acpi region uninitialized - upgrade BIOS?\n");
-    error_return=-ENODEV;
-  }
-#endif
-
+/* Determine the address of the SMBus area */
   pci_read_config_word_united(ALI15X3_dev, ALI15X3_bus ,ALI15X3_devfn,
                               SMBBA,&ali15x3_smba);
   ali15x3_smba &= (0xffff & ~ (ALI15X3_SMB_IOSIZE - 1));
@@ -284,14 +257,6 @@ int ali15x3_setup(void)
   if(error_return == -ENODEV)
     goto END;
 
-#ifdef MAP_ACPI
-  if (check_region(ali15x3_acpia, ALI15X3_ACPI_IOSIZE)) {
-    printk("i2c-ali15x3.o: ALI15X3_acpi region 0x%x already in use!\n", ali15x3_acpia);
-    printk("i2c-ali15x3.o: If conflicting ACPI software is installed, undefine MAP_ACPI and recompile!\n");
-    error_return=-ENODEV;
-  }
-#endif
-
   if (check_region(ali15x3_smba, ALI15X3_SMB_IOSIZE)) {
     printk("i2c-ali15x3.o: ALI15X3_smb region 0x%x already in use!\n", ali15x3_smba);
     error_return=-ENODEV;
@@ -304,7 +269,7 @@ int ali15x3_setup(void)
     pci_read_config_byte_united(ALI15X3_dev, ALI15X3_bus ,ALI15X3_devfn,
                                 SMBCOM, &temp);
   if ((temp & 1) == 0) {
-    printk("SMBUS: Error: ACPI/SMB device not enabled - upgrade BIOS?\n");     
+    printk("SMBUS: Error: SMB device not enabled - upgrade BIOS?\n");     
     error_return=-ENODEV;
     goto END;
   }
@@ -337,9 +302,6 @@ int ali15x3_setup(void)
                                SMBCLK, 0x20);
 
   /* Everything is happy, let's grab the memory and set things up. */
-#ifdef MAP_ACPI
-  request_region(ali15x3_acpia, ALI15X3_ACPI_IOSIZE, "ali15x3-acpi");       
-#endif
   request_region(ali15x3_smba, ALI15X3_SMB_IOSIZE, "ali15x3-smb");       
 
 #ifdef DEBUG
@@ -639,9 +601,6 @@ int __init i2c_ali15x3_init(void)
     return res;
   }
   ali15x3_initialized ++;
-#ifdef MAP_ACPI
-  sprintf(ali15x3_adapter.name,"ACPI ALI15X3 at %04x",ali15x3_acpia);
-#endif
   sprintf(ali15x3_adapter.name,"SMBus ALI15X3 adapter at %04x",ali15x3_smba);
   if ((res = i2c_add_adapter(&ali15x3_adapter))) {
     printk("i2c-ali15x3.o: Adapter registration failed, module not inserted.\n");
@@ -665,9 +624,6 @@ int __init ali15x3_cleanup(void)
       ali15x3_initialized--;
   }
   if (ali15x3_initialized >= 1) {
-#ifdef MAP_ACPI
-    release_region(ali15x3_acpia, ALI15X3_ACPI_IOSIZE);
-#endif
     release_region(ali15x3_smba, ALI15X3_SMB_IOSIZE);
     ali15x3_initialized--;
   }