[Intel-gfx] [PATCH v2 2/3] drm/i915: Acer C720 and C720P have controllable backlights

[Scot Doyle]

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 at gmail.com>
Tested-by: Michael Mullin <masmullin at gmail.com>
Signed-off-by: Scot Doyle <lkml14 at scotdoyle.com>
CC: Jani Nikula <jani.nikula at intel.com>
---
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7b5f193..18089bf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12391,6 +12391,9 @@ 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)