Index: drivers/gpu/drm/Kconfig |
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig |
index 305c590039634603972d31ed02ab72b49e202938..14e21c37c01118907cfde0279dc0b3b296341c5a 100644 |
--- a/drivers/gpu/drm/Kconfig |
+++ b/drivers/gpu/drm/Kconfig |
@@ -124,6 +124,18 @@ config DRM_I915_KMS |
the driver to bind to PCI devices, which precludes loading things |
like intelfb. |
+config DRM_I915_DIRECT_BACKLIGHT |
+ bool "Enable direct backlight control" |
+ depends on DRM_I915 |
+ help |
+ Choose this option if you want the i915 driver to provide direct |
+ backlight control via /sys/class/backlight/i915_backlight. This |
+ is in addition to the ACPI interface (which may also be in that |
+ directory) that uses ASLE (ACPI Source Language Events) events to |
+ get to i915_opregion.c code. |
+ Direct backlight control gives finer granularity (0-256) than ACPI |
+ and does not require BIOS support. |
+ |
endchoice |
config DRM_MGA |