Handle HKEY event generated on AC power change. The current message
asks users to submit data related to this event which leads to
a lot of confusion and noise on the mailing list.

The following is a list affected models and 'Message-Id'
from [email protected] of people who saw this
event when either plugging or unplugging the AC adapter or
docking or undocking their laptop.

X120e - caaaujb5v9dhdbdxdvvhnjog4urzc1tgkqeb_zgpay7q8kzh...@mail.gmail.com
X121e - [email protected]
X220  - Confirmed by Richard Hartmann
X220i - [email protected]
X220t - [email protected]
X230  - CAKx4u7kqvVH0-gstomsiVYdGC0i6=bgxzaq8sq9gbg76tgm...@mail.gmail.com
T420  - [email protected]
T420s - [email protected]
W520  - [email protected]

Signed-off-by: Richard Hartmann <[email protected]>
---
 drivers/platform/x86/thinkpad_acpi.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c 
b/drivers/platform/x86/thinkpad_acpi.c
index 75dd651..15e2bba 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -209,9 +209,8 @@ enum tpacpi_hkey_event_t {
        TP_HKEY_EV_ALARM_SENSOR_XHOT    = 0x6022, /* sensor critically hot */
        TP_HKEY_EV_THM_TABLE_CHANGED    = 0x6030, /* thermal table changed */
 
-       TP_HKEY_EV_UNK_6040             = 0x6040, /* Related to AC change?
-                                                    some sort of APM hint,
-                                                    W520 */
+       /* AC-related events */
+       TP_HKEY_EV_AC_CHANGED           = 0x6040, /* AC status changed */
 
        /* Misc */
        TP_HKEY_EV_RFKILL_CHANGED       = 0x7000, /* rfkill switch changed */
@@ -3629,6 +3628,12 @@ static bool hotkey_notify_6xxx(const u32 hkey,
                         "a sensor reports something is extremely hot!\n");
                /* recommended action: immediate sleep/hibernate */
                break;
+       case TP_HKEY_EV_AC_CHANGED:
+               /* X120e, X121e, X220, X220i, X220t, X230, T420, T420s, W520:
+                * AC status changed; can be triggered by plugging or
+                * unplugging AC adapter, docking or undocking. */
+
+               /* fallthrough */
 
        case TP_HKEY_EV_KEY_NUMLOCK:
        case TP_HKEY_EV_KEY_FN:
-- 
1.7.10.4


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