[PATCH 03/10] Acer-WMI: fingers off backlight if video.ko is serving this functionality

[Andy Whitcroft]

From: Thomas Renninger <trenn at suse.de>

Bug: #257827
commit febf2d95a71cd594182e4b3defb0e0ffdfe61482 upstream

Signed-off-by: Thomas Renninger <trenn at suse.de>
Acked-by: Zhang Rui <rui.zhang at intel.com>
Signed-off-by: Andi Kleen <ak at linux.intel.com>
Acked-by: Carlos Corbacho <carlos at strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown at intel.com>
Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
 drivers/misc/acer-wmi.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/misc/acer-wmi.c b/drivers/misc/acer-wmi.c
index d8b0d32..a4bef92 100644
--- a/drivers/misc/acer-wmi.c
+++ b/drivers/misc/acer-wmi.c
@@ -1242,6 +1242,12 @@ static int __init acer_wmi_init(void)
 
 	set_quirks();
 
+	if (!acpi_video_backlight_support() && has_cap(ACER_CAP_BRIGHTNESS)) {
+		interface->capability &= ~ACER_CAP_BRIGHTNESS;
+		printk(ACER_INFO "Brightness must be controlled by "
+		       "generic video driver\n");
+	}
+
 	if (platform_driver_register(&acer_platform_driver)) {
 		printk(ACER_ERR "Unable to register platform driver.\n");
 		goto error_platform_register;
-- 
1.6.0.4.911.gc990