Apparently there are Apple laptops with magic smoke for a VBIOS, which
we fail to find and use. Default to having and setting up backlight in
this case.
This fixes a regression introduced by
commit c675949ec58ca50d5a3ae3c757892f1560f6e896
Author: Jani Nikula <jani.nikula@xxxxxxxxx>
Date: Wed Apr 9 11:31:37 2014 +0300
drm/i915: do not setup backlight if not available according to VBT
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=77831
Reported-by: Matteo Cypriani <mcy@xxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 3.15+
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_bios.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 1ee98f121a00..827498e081df 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -315,9 +315,6 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
const struct bdb_lfp_backlight_data *backlight_data;
const struct bdb_lfp_backlight_data_entry *entry;
- /* Err to enabling backlight if no backlight block. */
- dev_priv->vbt.backlight.present = true;
-
backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
if (!backlight_data)
return;
@@ -1088,6 +1085,9 @@ init_vbt_defaults(struct drm_i915_private *dev_priv)
dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
+ /* Default to having backlight */
+ dev_priv->vbt.backlight.present = true;
+
/* LFP panel data */
dev_priv->vbt.lvds_dither = 1;
dev_priv->vbt.lvds_vbt = 0;
--
1.9.1
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