ideapad: read brightness setting on brightness key notify

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>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 114d95247cdf..21b101899bae 100644
--- 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);
                 }