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Subject[PATCH] nouveau: Don't expose backlight control in presence of ACPI
From: Aaron Sowry <aaron@aeneby.se>

Avoid confusing userspace by not publishing backlight controls if ACPI equivalents are available.
Signed-off-by: Aaron Sowry <aaron@aeneby.se>
---
--- linux-2.6/drivers/gpu/drm/nouveau/nouveau_state.c.orig 2010-11-03 09:56:29.502828966 +0100
+++ linux-2.6/drivers/gpu/drm/nouveau/nouveau_state.c 2010-11-03 10:46:27.765829000 +0100
@@ -23,6 +23,7 @@
* DEALINGS IN THE SOFTWARE.
*/

+#include <linux/acpi.h>
#include <linux/swab.h>
#include <linux/slab.h>
#include "drmP.h"
@@ -648,9 +649,14 @@ nouveau_card_init(struct drm_device *dev
goto out_fence;
}

- ret = nouveau_backlight_init(dev);
- if (ret)
- NV_ERROR(dev, "Error %d registering backlight\n", ret);
+ if (acpi_video_backlight_support())
+ NV_INFO(dev, "Detected ACPI backlight support, "
+ "not registering interface\n");
+ else {
+ ret = nouveau_backlight_init(dev);
+ if (ret)
+ NV_ERROR(dev, "Error %d registering backlight\n", ret);
+ }

nouveau_fbcon_init(dev);
drm_kms_helper_poll_init(dev);[unhandled content-type:application/pgp-signature]
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