Commit 96960880 authored by Seth Forshee's avatar Seth Forshee Committed by Matthew Garrett
Browse files

apple-gmux: Add suspend/resume support for the backlight 



After S3, the brightness might not be restored to the pre-suspend value.
Request status update calls from the backlight core on suspend/resume to
ensure the brightness value is restored.

Reported-and-tested-by: default avatarAustin Lund <austin.lund@gmail.com>
Signed-off-by: default avatarSeth Forshee <seth.forshee@canonical.com>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
parent bc7ab495

drivers/platform/x86/apple-gmux.c

+4 −0
Original line number Diff line number Diff line
@@ -87,6 +87,9 @@ static int gmux_update_status(struct backlight_device *bd) 
	struct apple_gmux_data *gmux_data = bl_get_data(bd);

	u32 brightness = bd->props.brightness;



	if (bd->props.state & BL_CORE_SUSPENDED)

		brightness = 0;



	/*

	 * Older gmux versions require writing out lower bytes first then

	 * setting the upper byte to 0 to flush the values. Newer versions
@@ -102,6 +105,7 @@ static int gmux_update_status(struct backlight_device *bd) 
}



static const struct backlight_ops gmux_bl_ops = {

	.options = BL_CORE_SUSPENDRESUME,

	.get_brightness = gmux_get_brightness,

	.update_status = gmux_update_status,

};