---

yaml
---
r: 375710
b: refs/heads/master
c: 0ab5bb6
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 28fe5c825f8e15744d04c7c1b8df197950923ecd
+refs/heads/master: 0ab5bb64937d76c660c29813d8de0f4b47bf7550

trunk/drivers/acpi/ac.c

@@ -28,6 +28,8 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/types.h>
+#include <linux/dmi.h>
+#include <linux/delay.h>
 #ifdef CONFIG_ACPI_PROCFS_POWER
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
@@ -74,6 +76,8 @@ static int acpi_ac_resume(struct device *dev);
 #endif
 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
 
+static int ac_sleep_before_get_state_ms;
+
 static struct acpi_driver acpi_ac_driver = {
 	.name = "ac",
 	.class = ACPI_AC_CLASS,
@@ -252,6 +256,16 @@ static void acpi_ac_notify(struct acpi_device *device, u32 event)
 	case ACPI_AC_NOTIFY_STATUS:
 	case ACPI_NOTIFY_BUS_CHECK:
 	case ACPI_NOTIFY_DEVICE_CHECK:
+		/*
+		 * A buggy BIOS may notify AC first and then sleep for
+		 * a specific time before doing actual operations in the
+		 * EC event handler (_Qxx). This will cause the AC state
+		 * reported by the ACPI event to be incorrect, so wait for a
+		 * specific time for the EC event handler to make progress.
+		 */
+		if (ac_sleep_before_get_state_ms > 0)
+			msleep(ac_sleep_before_get_state_ms);
+
 		acpi_ac_get_state(ac);
 		acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 		acpi_bus_generate_netlink_event(device->pnp.device_class,
@@ -264,6 +278,24 @@ static void acpi_ac_notify(struct acpi_device *device, u32 event)
 	return;
 }
 
+static int thinkpad_e530_quirk(const struct dmi_system_id *d)
+{
+	ac_sleep_before_get_state_ms = 1000;
+	return 0;
+}
+
+static struct dmi_system_id ac_dmi_table[] = {
+	{
+	.callback = thinkpad_e530_quirk,
+	.ident = "thinkpad e530",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
+		},
+	},
+	{},
+};
+
 static int acpi_ac_add(struct acpi_device *device)
 {
 	int result = 0;
@@ -312,6 +344,7 @@ static int acpi_ac_add(struct acpi_device *device)
 		kfree(ac);
 	}
 
+	dmi_check_system(ac_dmi_table);
 	return result;
 }