ideapad: read brightness setting on brightness key notify

commit 2165136585b5c7d6f118f1d90fbde550bb7de212 upstream.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=25922
On ideapad Y530, the brightness key notify will be blocked if the last notify
is not responsed by getting the brightness value. Read value when we get the
notify shall fix the problem and will not have any difference on other ideapads.

Signed-off-by: Ike Panhc <ike.pan@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 114d95247cdf8f6ad3c07d14a6a88496d6f63f43..21b101899baeeb76e718c80c089caa2c8553c848 100644 (file)
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -459,6 +459,8 @@ static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
                if (test_bit(vpc_bit, &vpc1)) {
                        if (vpc_bit == 9)
                                ideapad_sync_rfk_state(adevice);
+                       else if (vpc_bit == 4)
+                               read_ec_data(handle, 0x12, &vpc2);
                        else
                                ideapad_input_report(priv, vpc_bit);
                }