This is a note to let you know that I've just added the patch titled
drm/i915: default to having backlight if VBT not available
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-default-to-having-backlight-if-vbt-not-available.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 56c4b63aaf4c2cd91966b2a5e69e5367bea60bbe Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@xxxxxxxxx>
Date: Tue, 17 Jun 2014 15:47:05 +0300
Subject: drm/i915: default to having backlight if VBT not available
From: Jani Nikula <jani.nikula@xxxxxxxxx>
commit 56c4b63aaf4c2cd91966b2a5e69e5367bea60bbe upstream.
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-and-tested-by: Matteo Cypriani <mcy@xxxxxx>
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_bios.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -287,9 +287,6 @@ parse_lfp_backlight(struct drm_i915_priv
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;
@@ -839,6 +836,9 @@ init_vbt_defaults(struct drm_i915_privat
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;
Patches currently in stable-queue which might be from jani.nikula@xxxxxxxxx are
queue-3.15/drm-i915-set-backlight-duty-cycle-after-backlight-enable-for-gen4.patch
queue-3.15/drm-i915-default-to-having-backlight-if-vbt-not-available.patch
queue-3.15/drm-i915-hold-the-table-lock-whilst-walking-the-file-s-idr-and-counting-the-objects-in-debugfs.patch
queue-3.15/drm-i915-disable-fbc-by-default-also-on-haswell-and-later.patch
queue-3.15/drm-i915-reorder-semaphore-deadlock-check.patch
queue-3.15/drm-i915-avoid-div-by-zero-when-pixel_multiplier-is-zero.patch
--
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