Commit d4afc775 authored Oct 23, 2011 by Rene Bollford Committed by Matthew Garrett Oct 24, 2011

[PATCH] ideapad: Check if acpi already handle backlight power to avoid a page fault



This patch avoid a page fault in the ideapad-laptop extras when
turning the backlight power on or off.

Signed-off-by: Rene Bolldorf <xsecute@googlemail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

parent 1709adab

drivers/platform/x86/ideapad-laptop.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -493,6 +493,8 @@ static void ideapad_backlight_notify_power(struct ideapad_private *priv)
		unsigned long power;
		struct backlight_device *blightdev = priv->blightdev;

		if (!blightdev)
		return;
		if (read_ec_data(ideapad_handle, 0x18, &power))
		return;
		blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;