thinkpad-acpi: silence bogus warning when ACPI video is disabled

Make use of acpi_video_backlight_support() also in hotkey_init, to make
sure this doesn't happen:

thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness
               control, supported by the ACPI video driver
thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
thinkpad_acpi: Standard ACPI backlight interface not available,
               thinkpad_acpi native brightness control enabled
thinkpad_acpi: detected a 16-level brightness capable ThinkPad

Note that this is purely cosmetic, there is absolutely _no_ change in
behaviour.  Those events are sometimes enabled at runtime by userspace, but
the driver never enables them by itself unless someone messed with the
default keymaps.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Reported-by: Jochen Schulz <jrschulz@well-adjusted.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 06c7c03c8f2f..5a22a064222c 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2655,7 +2655,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                 /* update bright_acpimode... */
                 tpacpi_check_std_acpi_brightness_support();
 
-        if (tp_features.bright_acpimode) {
+        if (tp_features.bright_acpimode && acpi_video_backlight_support()) {
                 printk(TPACPI_INFO
                        "This ThinkPad has standard ACPI backlight "
                        "brightness control, supported by the ACPI "