From: Thomas Renninger <trenn@suse.de>
Date: Fri, 1 Aug 2008 15:38:01 +0000 (+0200)
Subject: msi-laptop: fingers off backlight if video.ko is serving this functionality
X-Git-Tag: firefly_0821_release~16872^2~2^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a598c82f39892069a8f6693459b1179fd9ef30e1;p=firefly-linux-kernel-4.4.55.git

msi-laptop: 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>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/misc/msi-laptop.c b/drivers/misc/msi-laptop.c
index de898c6938f3..759763d18e4c 100644
--- a/drivers/misc/msi-laptop.c
+++ b/drivers/misc/msi-laptop.c
@@ -347,12 +347,16 @@ static int __init msi_init(void)
 
 	/* Register backlight stuff */
 
-	msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,
-						&msibl_ops);
-	if (IS_ERR(msibl_device))
-		return PTR_ERR(msibl_device);
-
-	msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
+	if (acpi_video_backlight_support()) {
+		printk(KERN_INFO "MSI: Brightness ignored, must be controlled "
+		       "by ACPI video driver\n");
+	} else {
+		msibl_device = backlight_device_register("msi-laptop-bl", NULL,
+							 NULL, &msibl_ops);
+		if (IS_ERR(msibl_device))
+			return PTR_ERR(msibl_device);
+		msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
+	}
 
 	ret = platform_driver_register(&msipf_driver);
 	if (ret)