Port the backlight selection logic to the new backlight interface
selection API.

This commit also removes various obsolete pr_xxx messages related to
backlight interface selection. These are obsolete because they assume
there is only a vendor or acpi backlight driver and no other choice.
Also they are not necessary, if the user wants to know which backlight
interfaces are registered a simple "ls /sys/class/backlight" suffices.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/platform/x86/asus-laptop.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/asus-laptop.c 
b/drivers/platform/x86/asus-laptop.c
index 46b2746..58d29c4 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -54,6 +54,7 @@
 #include <linux/slab.h>
 #include <linux/dmi.h>
 #include <linux/acpi.h>
+#include <acpi/video.h>

 #define ASUS_LAPTOP_VERSION    "0.42"

@@ -1884,12 +1885,11 @@ static int asus_acpi_add(struct acpi_device *device)
        if (result)
                goto fail_platform;

-       if (!acpi_video_backlight_support()) {
+       if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
                result = asus_backlight_init(asus);
                if (result)
                        goto fail_backlight;
-       } else
-               pr_info("Backlight controlled by ACPI video driver\n");
+       }

        result = asus_input_init(asus);
        if (result)
-- 
2.4.2

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