linux-kernel - [PATCH 3.16 073/357] drm/i915: Ignore VBT backlight presence check on Acer C720 (4005U)

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Date:	Fri,  3 Oct 2014 14:27:39 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Scot Doyle <lkml14@...tdoyle.com>,
	Tyler Cleveland <siralucardt@...nmailbox.org>,
	Jani Nikula <jani.nikula@...el.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 3.16 073/357] drm/i915: Ignore VBT backlight presence check on Acer C720 (4005U)

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Scot Doyle <lkml14@...tdoyle.com>

commit dfb3d47b2369ad752ab9f7438bbf9949524b46ae upstream.

commit c675949ec58ca50d5a3ae3c757892f1560f6e896
Author: Jani Nikula <jani.nikula@...el.com>
Date:   Wed Apr 9 11:31:37 2014 +0300

    drm/i915: do not setup backlight if not available according to VBT

prevents backlight setup on the Acer C720 (Core i3 4005U CPU), which has a
misconfigured VBT. Apply quirk to ignore the VBT backlight presence check
during backlight setup.

Signed-off-by: Scot Doyle <lkml14@...tdoyle.com>
Tested-by: Tyler Cleveland <siralucardt@...nmailbox.org>
Cc: Jani Nikula <jani.nikula@...el.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/intel_display.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11690,6 +11690,9 @@ static struct intel_quirk intel_quirks[]
 	/* Acer C720 and C720P Chromebooks (Celeron 2955U) have backlights */
 	{ 0x0a06, 0x1025, 0x0a11, quirk_backlight_present },
 
+	/* Acer C720 Chromebook (Core i3 4005U) */
+	{ 0x0a16, 0x1025, 0x0a11, quirk_backlight_present },
+
 	/* Toshiba CB35 Chromebook (Celeron 2955U) */
 	{ 0x0a06, 0x1179, 0x0a88, quirk_backlight_present },
 


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