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 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html