3 files changed, 48 insertions, 21 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 4c51a2f8fd31..de8ce79dd881 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1359,6 +1359,17 @@ static void __init acpi_process_madt(void)
                                "Invalid BIOS MADT, disabling ACPI\n");
                         disable_acpi();
                 }
+        } else {
+                /*
+                 * ACPI found no MADT, and so ACPI wants UP PIC mode.
+                 * In the event an MPS table was found, forget it.
+                 * Boot with "acpi=off" to use MPS on such a system.
+                 */
+                if (smp_found_config) {
+                        printk(KERN_WARNING PREFIX
+                                "No APIC-table, disabling MPS\n");
+                        smp_found_config = 0;
+                }
         }
 #endif
         return;
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 3105e0410e9b..2e8317bf723e 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -982,9 +982,9 @@ static const struct acpi_device_id ec_device_ids[] = {
 
 int __init acpi_ec_ecdt_probe(void)
 {
-        int ret;
         acpi_status status;
         struct acpi_table_ecdt *ecdt_ptr;
+        acpi_handle dummy;
 
         boot_ec = make_acpi_ec();
         if (!boot_ec)
@@ -1010,30 +1010,31 @@ int __init acpi_ec_ecdt_probe(void)
                 boot_ec->gpe = ecdt_ptr->gpe;
                 boot_ec->handle = ACPI_ROOT_OBJECT;
                 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
-        } else {
-                /* This workaround is needed only on some broken machines,
-                 * which require early EC, but fail to provide ECDT */
-                acpi_handle x;
-                printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
-                status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
-                                                boot_ec, NULL);
-                /* Check that acpi_get_devices actually find something */
-                if (ACPI_FAILURE(status) || !boot_ec->handle)
-                        goto error;
-                /* We really need to limit this workaround, the only ASUS,
-                 * which needs it, has fake EC._INI method, so use it as flag.
-                 * Keep boot_ec struct as it will be needed soon.
-                 */
-                if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
-                        return -ENODEV;
+                /* Add some basic check against completely broken table */
+                if (boot_ec->data_addr != boot_ec->command_addr)
+                        goto install;
+        /* fall through */
         }
-
-        ret = ec_install_handlers(boot_ec);
-        if (!ret) {
+        /* This workaround is needed only on some broken machines,
+         * which require early EC, but fail to provide ECDT */
+        printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
+        status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
+                                        boot_ec, NULL);
+        /* Check that acpi_get_devices actually find something */
+        if (ACPI_FAILURE(status) || !boot_ec->handle)
+                goto error;
+        /* We really need to limit this workaround, the only ASUS,
+         * which needs it, has fake EC._INI method, so use it as flag.
+         * Keep boot_ec struct as it will be needed soon.
+         */
+        if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &dummy)))
+                return -ENODEV;
+install:
+        if (!ec_install_handlers(boot_ec)) {
                 first_ec = boot_ec;
                 return 0;
         }
-      error:
+error:
         kfree(boot_ec);
         boot_ec = NULL;
         return -ENODEV;
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index baa441929720..38bf8b43fd19 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -36,6 +36,7 @@
 #include <linux/backlight.h>
 #include <linux/thermal.h>
 #include <linux/video_output.h>
+#include <linux/sort.h>
 #include <asm/uaccess.h>
 
 #include <acpi/acpi_bus.h>
@@ -626,6 +627,16 @@ acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 }
 
 /*
+ * Simple comparison function used to sort backlight levels.
+ */
+
+static int
+acpi_video_cmp_level(const void *a, const void *b)
+{
+        return *(int *)a - *(int *)b;
+}
+
+/*
  *  Arg:        
  *      device  : video output device (LCD, CRT, ..)
  *
@@ -676,6 +687,10 @@ acpi_video_init_brightness(struct acpi_video_device *device)
                 count++;
         }
 
+        /* don't sort the first two brightness levels */
+        sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
+                acpi_video_cmp_level, NULL);
+
         if (count < 2)
                 goto out_free_levels;