Acer-WMI: fingers off backlight if video.ko is serving this functionality

Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/misc/acer-wmi.c b/drivers/misc/acer-wmi.c
index 0532a2de2ce4decf8ef2744d5bfcaa4054b13597..94c9f911824ef5b3279205a41a87dd169935f1db 100644 (file)
--- a/drivers/misc/acer-wmi.c
+++ b/drivers/misc/acer-wmi.c
@@ -1297,6 +1297,12 @@ 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;