diff -ru linux/Documentation/Configure.help linux-DC1RN/Documentation/Configure.help
--- linux/Documentation/Configure.help	Wed Aug 7 18:48:51 2001
+++ linux-DC1RN/Documentation/Configure.patch	Wed Aug 7 19:35:31 2001
@@ -11290,9 +11290,20 @@
 
 Use real mode APM BIOS call to power off
 CONFIG_APM_REAL_MODE_POWER_OFF
-  Use real mode APM BIOS calls to switch off the computer. This is
-  a work-around for a number of buggy BIOSes. Switch this option on if
-  your computer crashes instead of powering off properly.
+   Use workaround to be able to switch off the computer by software.
+   This patch is necessary for the TYAN S1590S mainboard. For
+   systems that do not have this chipset, this patch will have no
+   effect except enlarging the kernel by about 150 bytes. This
+   workaround should also work on other systems which have the same
+   chipset (south bridge) as these mainboards, but does not have to be
+   necessary (since other mainboards do not necessarily have the same
+   problem).
+ 
+   Say Y if you have this crappy TYAN mainboard, or N if not.
+ 
+   Tell TYAN what you think of them!
+   Other versions of this patch can be found on
+   http://www.qsl.net/dc1rn/software/download/
 
 Watchdog Timer Support 
 CONFIG_WATCHDOG
--- linux/arch/i386/kernel/apm.c	Tue Jan  4 19:12:11 2000
+++ linux-DC1RN/arch/i386/kernel/apm.c	Wed Aug 7 19:28:09 2001
@@ -165,6 +165,8 @@
 #include <linux/miscdevice.h>
 #include <linux/apm_bios.h>
 #include <linux/init.h>
+#include <linux/pci.h>
+#include <asm/io.h>
 #include <linux/interrupt.h>
 
 #include <asm/system.h>
@@ -605,20 +607,47 @@
 static void apm_power_off(void)
 {
 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
-	unsigned char	po_bios_call[] = {
-		0xb8, 0x00, 0x10,	/* movw  $0x1000,ax  */
-		0x8e, 0xd0,		/* movw  ax,ss       */
-		0xbc, 0x00, 0xf0,	/* movw  $0xf000,sp  */
-		0xb8, 0x07, 0x53,	/* movw  $0x5307,ax  */
-		0xbb, 0x01, 0x00,	/* movw  $0x0001,bx  */
-		0xb9, 0x03, 0x00,	/* movw  $0x0003,cx  */
-		0xcd, 0x15		/* int   $0x15       */
-	};
+           {
+               if ( pcibios_present( ) )
+               {
+                unsigned char  Bus;          /* Bus on which device is found */
+               	unsigned char  FunctionNr;   /* Function number of the device */
+               	unsigned short Data;         /* Data to be read or written */
+                   if ( pcibios_find_device( 0x1106, 0x3040, 0x0000, &Bus,
+                        &FunctionNr ) != PCIBIOS_SUCCESSFUL )
+                   {
+                       (void) apm_set_power_state(APM_STATE_OFF);
+                   }
+                      if( pcibios_read_config_word( Bus, FunctionNr, 0x08, &Data ) !=
+                       PCIBIOS_SUCCESSFUL )
+                   {
+                       (void) apm_set_power_state(APM_STATE_OFF);
+                   }
+                   Data&=0x00FF;
+                   if( Data == 0x0000 )
+                   {
+                       if( pcibios_read_config_word( Bus, FunctionNr, 0x20, &Data )
+                           != PCIBIOS_SUCCESSFUL )
+                       {
+                           (void) apm_set_power_state(APM_STATE_OFF);
+                       }
+                   }
+                   else
+                   {
+                       if( pcibios_read_config_word( Bus, FunctionNr, 0x48, &Data )
+                           != PCIBIOS_SUCCESSFUL )
+                       {
+                           (void) apm_set_power_state(APM_STATE_OFF);
+                       }
+                   }
+                   Data&=0xFF00;
+                   Data+=0x0004;
+                   outw_p( 0x2000, Data );
+               }
+               (void) apm_set_power_state(APM_STATE_OFF);
+           }
+ 	
 #endif
-
-	/*
-	 * This may be called on an SMP machine.
-	 */
 #ifdef CONFIG_SMP
 	/* Some bioses don't like being called from CPU != 0 */
 	while (cpu_number_map[smp_processor_id()] != 0) {
@@ -628,7 +657,7 @@
 	}
 #endif
 #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
-	machine_real_restart(po_bios_call, sizeof(po_bios_call));
+	apm_power_off();
 #else
 	(void) apm_set_power_state(APM_STATE_OFF);
 #endif