From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20111207161215.679127908@clark.kroah.org> Date: Wed, 07 Dec 2011 08:11:13 -0800 From: Greg KH To: , Cc: , , , Alex Davis , Takashi Iwai , Keith Packard Subject: [011/104] drm/i915: Fix inconsistent backlight level during disabled In-Reply-To: <20111207161246.GA10995@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 04b38670cf46c096705f24e92a8747d1ab89e53c upstream. When the brightness property is inquired while the backlight is disabled, the driver returns a wrong value (zero) because it probes the value after the backlight was turned off. This caused a black screen even after the backlight is enabled again. It should return the internal backlight_level instead, so that it won't be influenced by the backlight-enable state. BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=41926 BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652 Tested-by: Kamal Mostafa Cc: Alex Davis Signed-off-by: Takashi Iwai Signed-off-by: Keith Packard Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_panel.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -326,7 +326,8 @@ static int intel_panel_update_status(str static int intel_panel_get_brightness(struct backlight_device *bd) { struct drm_device *dev = bl_get_data(bd); - return intel_panel_get_backlight(dev); + struct drm_i915_private *dev_priv = dev->dev_private; + return dev_priv->backlight_level; } static const struct backlight_ops intel_panel_bl_ops = {