From mboxrd@z Thu Jan 1 00:00:00 1970 From: Woody Suwalski Subject: Re: [PATCH] drm/i915: Fix inconsistent backlight level during disabled Date: Sat, 19 Nov 2011 15:02:16 -0500 Message-ID: <4EC80B48.4060808@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Takashi Iwai Cc: Keith Packard , intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, Alex Davis , Kamal Mostafa , mjg@redhat.com List-Id: intel-gfx@lists.freedesktop.org Takashi Iwai wrote: > 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 > Cc: > Signed-off-by: Takashi Iwai > --- > drivers/gpu/drm/i915/intel_panel.c | 3 ++- > 1 files changed, 2 insertions(+), 1 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c > index 499d4c0..21f60b7 100644 > --- 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(struct backlight_device *bd) > 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 = { Seems to be fixing a black-screen regression since 3.0 on EeePC devices as well... Thanks, Woody