1 files changed, 4 insertions, 53 deletions

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index b83676126598..42d3d72dae85 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -17,15 +17,14 @@
  * capabilities the graphics cards plugged in support. The check for general
  * video capabilities will be triggered by the first caller of
  * acpi_video_get_capabilities(NULL); which will happen when the first
- * backlight (or display output) switching supporting driver calls:
+ * backlight switching supporting driver calls:
  * acpi_video_backlight_support();
  *
  * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
  * are available, video.ko should be used to handle the device.
  *
  * Otherwise vendor specific drivers like thinkpad_acpi, asus_acpi,
- * sony_acpi,... can take care about backlight brightness and display output
- * switching.
+ * sony_acpi,... can take care about backlight brightness.
  *
  * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
  * this file will not be compiled, acpi_video_get_capabilities() and
@@ -83,11 +82,6 @@ long acpi_is_video_device(struct acpi_device *device)
         if (!device)
                 return 0;
 
-        /* Is this device able to support video switching ? */
-        if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) ||
-            ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
-                video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
-
         /* Is this device able to retrieve a video ROM ? */
         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
@@ -161,8 +155,6 @@ long acpi_video_get_capabilities(acpi_handle graphics_handle)
                  *
                  *   if (dmi_name_in_vendors("XY")) {
                  *      acpi_video_support |=
-                 *              ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR;
-                 *      acpi_video_support |=
                  *              ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
                  *}
                  */
@@ -212,33 +204,8 @@ int acpi_video_backlight_support(void)
 EXPORT_SYMBOL(acpi_video_backlight_support);
 
 /*
- * Returns true if video.ko can do display output switching.
- * This does not work well/at all with binary graphics drivers
- * which disable system io ranges and do it on their own.
- */
-int acpi_video_display_switch_support(void)
-{
-        if (!acpi_video_caps_checked)
-                acpi_video_get_capabilities(NULL);
-
-        if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR)
-                return 0;
-        else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO)
-                return 1;
-
-        if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR)
-                return 0;
-        else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO)
-                return 1;
-
-        return acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING;
-}
-EXPORT_SYMBOL(acpi_video_display_switch_support);
-
-/*
- * Use acpi_display_output=vendor/video or acpi_backlight=vendor/video
- * To force that backlight or display output switching is processed by vendor
- * specific acpi drivers or video.ko driver.
+ * Use acpi_backlight=vendor/video to force that backlight switching
+ * is processed by vendor specific acpi drivers or video.ko driver.
  */
 static int __init acpi_backlight(char *str)
 {
@@ -255,19 +222,3 @@ static int __init acpi_backlight(char *str)
         return 1;
 }
 __setup("acpi_backlight=", acpi_backlight);
-
-static int __init acpi_display_output(char *str)
-{
-        if (str == NULL || *str == '\0')
-                return 1;
-        else {
-                if (!strcmp("vendor", str))
-                        acpi_video_support |=
-                                ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR;
-                if (!strcmp("video", str))
-                        acpi_video_support |=
-                                ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO;
-        }
-        return 1;
-}
-__setup("acpi_display_output=", acpi_display_output);