ACPI / video: Allow forcing native backlight on non win8 machines

The native backlight behavior (so not registering both the acpi-video
and the vendor backlight driver) can be useful on some non win8 machines
too, so change the behavior of the video.use_native_backlight=1 or 0
kernel cmdline option to be: if user has set video.use_native_backlight=1
or 0, use that no matter if it is a win8 system or not. Also, we will
put some known systems into the DMI table to make them either use native
backlight interface or not, and the use_native_backlight_dmi is used to
reflect that.

Original-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 26eb70c8f518..2f45dca31724 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -82,9 +82,15 @@ module_param(allow_duplicates, bool, 0644);
  * For Windows 8 systems: used to decide if video module
  * should skip registering backlight interface of its own.
  */
-static int use_native_backlight_param = -1;
+enum {
+        NATIVE_BACKLIGHT_NOT_SET = -1,
+        NATIVE_BACKLIGHT_OFF,
+        NATIVE_BACKLIGHT_ON,
+};
+
+static int use_native_backlight_param = NATIVE_BACKLIGHT_NOT_SET;
 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
-static bool use_native_backlight_dmi = true;
+static int use_native_backlight_dmi = NATIVE_BACKLIGHT_NOT_SET;
 
 static int register_count;
 static struct mutex video_list_lock;
@@ -237,15 +243,16 @@ static void acpi_video_switch_brightness(struct work_struct *work);
 
 static bool acpi_video_use_native_backlight(void)
 {
-        if (use_native_backlight_param != -1)
+        if (use_native_backlight_param != NATIVE_BACKLIGHT_NOT_SET)
                 return use_native_backlight_param;
-        else
+        else if (use_native_backlight_dmi != NATIVE_BACKLIGHT_NOT_SET)
                 return use_native_backlight_dmi;
+        return acpi_osi_is_win8();
 }
 
 bool acpi_video_verify_backlight_support(void)
 {
-        if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
+        if (acpi_video_use_native_backlight() &&
             backlight_device_registered(BACKLIGHT_RAW))
                 return false;
         return acpi_video_backlight_support();
@@ -414,7 +421,7 @@ static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 
 static int __init video_disable_native_backlight(const struct dmi_system_id *d)
 {
-        use_native_backlight_dmi = false;
+        use_native_backlight_dmi = NATIVE_BACKLIGHT_OFF;
         return 0;
 }