dnl # dnl # commit v4.6-rc6-1-gf6a4790a5471 dnl # video / backlight: add two APIs for drivers to use dnl # AC_DEFUN([AC_AMDGPU_BACKLIGHT_DEVICE_SET_BRIGHTNESS], [ AC_KERNEL_DO_BACKGROUND([ AC_KERNEL_TRY_COMPILE_SYMBOL([ #include ], [ backlight_device_set_brightness(NULL, 0); ], [backlight_device_set_brightness], [drivers/video/backlight/backlight.c], [ AC_DEFINE(HAVE_BACKLIGHT_DEVICE_SET_BRIGHTNESS, 1, [backlight_device_set_brightness() is available]) ]) ]) ])