From: Scot Doyle <lkml14@scotdoyle.com>
Date: Fri, 11 Jul 2014 22:16:30 +0000 (+0000)
Subject: drm/i915: Ignore VBT backlight presence check on HP Chromebook 14
X-Git-Tag: v3.15.9~6
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e285bbe0c0e065f2602375e75069220211e47f7;p=thirdparty%2Fkernel%2Fstable.git

drm/i915: Ignore VBT backlight presence check on HP Chromebook 14

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@scotdoyle.com>
Tested-by: Stefan Nagy <public@stefan-nagy.at>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b91dfbe9fe8ed..c83eb75c7cfc1 100644
--- 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)