linux-kernel - [PATCH 3.15 37/42] drm/i915: Ignore VBT backlight presence check on HP Chromebook 14

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Date:	Tue,  5 Aug 2014 11:13:51 -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>,
	Stefan Nagy <public@...fan-nagy.at>,
	Jani Nikula <jani.nikula@...el.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 3.15 37/42] drm/i915: Ignore VBT backlight presence check on HP Chromebook 14

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

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

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

commit 724cb06fa9b1e1ffd98188275543fdb3b8eaca4f upstream.

commit c675949ec58ca50d5a3ae3c757892f1560f6e896
    drm/i915: do not setup backlight if not available according to VBT

caused a regression on the HP Chromebook 14 (with Celeron 2955U CPU),
which has a misconfigured VBT. Apply quirk to ignore the VBT backlight
presence check during backlight setup.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79813
Signed-off-by: Scot Doyle <lkml14@...tdoyle.com>
Tested-by: Stefan Nagy <public@...fan-nagy.at>
Cc: Jani Nikula <jani.nikula@...el.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
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
@@ -11251,6 +11251,9 @@ static struct intel_quirk intel_quirks[]
 
 	/* Toshiba CB35 Chromebook (Celeron 2955U) */
 	{ 0x0a06, 0x1179, 0x0a88, quirk_backlight_present },
+
+	/* HP Chromebook 14 (Celeron 2955U) */
+	{ 0x0a06, 0x103c, 0x21ed, quirk_backlight_present },
 };
 
 static void intel_init_quirks(struct drm_device *dev)


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