linux-kernel - [PATCH 3.15 61/84] drm/i915: Acer C720 and C720P have controllable backlights

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Date:	Tue, 15 Jul 2014 16:17:58 -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, James Duley <jagduley@...il.com>,
	Michael Mullin <masmullin@...il.com>,
	Scot Doyle <lkml14@...tdoyle.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 3.15 61/84] drm/i915: Acer C720 and C720P have controllable backlights

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

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

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

commit 2e93a1aa9ca455aa3ad0294bcd6d66f38bf8b758 upstream.

The Acer C720 and C720P Chromebooks (with Celeron 2955U CPU) have a
controllable backlight although their VBT reports otherwise. Apply quirk
to ignore the backlight presence check during backlight setup.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79813
Tested-by: James Duley <jagduley@...il.com>
Tested-by: Michael Mullin <masmullin@...il.com>
Signed-off-by: Scot Doyle <lkml14@...tdoyle.com>
CC: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
[danvet: Add cc: stable because the regressing commit is in 3.15.]
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
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
@@ -11245,6 +11245,9 @@ static struct intel_quirk intel_quirks[]
 
 	/* Acer Aspire 5336 */
 	{ 0x2a42, 0x1025, 0x048a, quirk_invert_brightness },
+
+	/* Acer C720 and C720P Chromebooks (Celeron 2955U) have backlights */
+	{ 0x0a06, 0x1025, 0x0a11, quirk_backlight_present },
 };
 
 static void intel_init_quirks(struct drm_device *dev)


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