input: Disable the AUX LoopBack command in i8042.c on Compaq ProLiant

       8-way Xeon ProFusion systems, as it causes crashes and reboots
       on these machines. DMI data is used for determining if the
       workaround should be enabled.
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>

arch/i386/kernel/dmi_scan.c

@@ -15,6 +15,9 @@
 unsigned long dmi_broken;
 EXPORT_SYMBOL(dmi_broken);
 
+unsigned int i8042_dmi_noloop = 0;
+EXPORT_SYMBOL(i8042_dmi_noloop);
+
 int is_sony_vaio_laptop;
 int is_unsafe_smbus;
 int es7000_plat = 0;
@@ -400,6 +403,17 @@ static __init int sony_vaio_laptop(struct dmi_blacklist *d)
 	return 0;
 }
 
+/*
+ * Several HP Proliant (and maybe other OSB4/ProFusion) systems
+ * shouldn't use the AUX LoopBack command, or they crash or reboot.
+ */
+
+static __init int set_8042_noloop(struct dmi_blacklist *d)
+{
+	i8042_dmi_noloop = 1;
+	return 0;
+}
+
 /*
  * This bios swaps the APM minute reporting bytes over (Many sony laptops
  * have this problem).
@@ -875,6 +889,23 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 			NO_MATCH, NO_MATCH,
 			} },
 
+	/*      
+	 * Several HP Proliant (and maybe other OSB4/ProFusion) systems
+	 * can't use i8042 in mux mode, or they crash or reboot.
+	 */                     
+
+	{ set_8042_noloop, "Compaq Proliant 8500", {
+			MATCH(DMI_SYS_VENDOR, "Compaq"),
+			MATCH(DMI_PRODUCT_NAME , "ProLiant"),
+			MATCH(DMI_PRODUCT_VERSION, "8500"),
+			NO_MATCH }},
+
+	{ set_8042_noloop, "Compaq Proliant DL760", {
+			MATCH(DMI_SYS_VENDOR, "Compaq"),
+			MATCH(DMI_PRODUCT_NAME , "ProLiant"),
+			MATCH(DMI_PRODUCT_VERSION, "DL760"),
+			NO_MATCH }},
+
 #ifdef	CONFIG_ACPI_BOOT
 	/*
 	 * If your system is blacklisted here, but you find that acpi=force

drivers/input/serio/i8042.c

 /*
  *  i8042 keyboard and mouse controller driver for Linux
  *
- *  Copyright (c) 1999-2002 Vojtech Pavlik
+ *  Copyright (c) 1999-2004 Vojtech Pavlik
  */
 
 /*
@@ -52,6 +52,8 @@ static unsigned int i8042_dumbkbd;
 module_param_named(dumbkbd, i8042_dumbkbd, bool, 0);
 MODULE_PARM_DESC(dumbkbd, "Pretend that controller can only read data from keyboard");
 
+static unsigned int i8042_noloop;
+
 __obsolete_setup("i8042_noaux");
 __obsolete_setup("i8042_nomux");
 __obsolete_setup("i8042_unlock");
@@ -154,6 +156,9 @@ static int i8042_command(unsigned char *param, int command)
 	unsigned long flags;
 	int retval = 0, i = 0;
 
+	if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
+		return -1;
+
 	spin_lock_irqsave(&i8042_lock, flags);
 
 	retval = i8042_wait_write();
@@ -955,6 +960,13 @@ int __init i8042_init(void)
 	if (i8042_dumbkbd)
 		i8042_kbd_port.write = NULL;
 
+#ifdef __i386__
+	if (i8042_dmi_noloop) {
+		printk(KERN_INFO "i8042.c: AUX LoopBack command disabled by DMI.\n");
+		i8042_noloop = 1;
+	}
+#endif
+
 	if (!i8042_noaux && !i8042_check_aux(&i8042_aux_values)) {
 		if (!i8042_nomux && !i8042_check_mux(&i8042_aux_values))
 			for (i = 0; i < 4; i++) {