[PATCH v2] dell-wmi: Set correct keycode for Fn + left arrow hotkey

[Pali Rohár]

From: Henk <henk.vergo...@gmail.com>

Fn + left arrow hotkey combination is used for enabling/disabling automatic
display brigthness based on integrated ALS sensor. For this purpose there
is standard linux key KEY_BRIGHTNESS_AUTO so use it instead of KEY_UNKNOWN.

Tested on Dell Lattitude E6500.

Signed-off-by: Henk Vergonet <henk.vergo...@gmail.com>
Reviewed-By: Pali Rohár <pali.ro...@gmail.com>
Reviewed-By: Mario Limonciello <mario.limoncie...@dell.com>
---
Changes since v1 by Pali
* Update commit description
---
 drivers/platform/x86/dell-wmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index 8d102195..7c918e37 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -233,7 +233,7 @@ static const u16 bios_to_linux_keycode[256] = {
        [18]    = KEY_PROG1,
        [19]    = KEY_BRIGHTNESSDOWN,
        [20]    = KEY_BRIGHTNESSUP,
-       [21]    = KEY_UNKNOWN,
+       [21]    = KEY_BRIGHTNESS_AUTO,
        [22]    = KEY_KBDILLUMTOGGLE,
        [23]    = KEY_UNKNOWN,
        [24]    = KEY_SWITCHVIDEOMODE,
-- 
2.11.0