From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Subject: Re: Linux 2.6.37-rc8 (no fb) Date: Wed, 29 Dec 2010 13:53:15 -0800 Message-ID: <20101229135315.5fe5c4e5@jbarnes-desktop> References: <20101229102127.06c0e505.randy.dunlap@oracle.com> <20101229121601.179983b7@jbarnes-desktop> <20101229131852.0792aac0@jbarnes-desktop> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from cpoproxy1-pub.bluehost.com (cpoproxy1-pub.bluehost.com [69.89.21.11]) by gabe.freedesktop.org (Postfix) with SMTP id BC2199E738 for ; Wed, 29 Dec 2010 13:53:18 -0800 (PST) In-Reply-To: <20101229131852.0792aac0@jbarnes-desktop> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Alex Riesen Cc: Randy Dunlap , Jeff Chua , Linus Torvalds , Linux Kernel Mailing List , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org > > Doesn't change anything here. Display stays blank. > > Sounds like your problem is separate from SSC then, more likely related > to panel power or backlight control. Have you tried bisecting for the > problem between 2.6.35 and 2.6.36? Nevermind, I just checked out the bug, looks like it is panel power related. Can you try this patch? If it doesn't work, can you send me the output of intel_reg_dumper from before you turn off the display and after you try to turn it back on? Thanks, -- Jesse Barnes, Intel Open Source Technology Center diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index aa23070..830e3b0 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -82,8 +82,6 @@ static void intel_lvds_enable(struct intel_lvds *intel_lvds) lvds_reg = LVDS; } - I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN); - if (intel_lvds->pfit_dirty) { /* * Enable automatic panel scaling so that non-native modes @@ -104,7 +102,7 @@ static void intel_lvds_enable(struct intel_lvds *intel_lvds) } I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON); - POSTING_READ(lvds_reg); + POSTING_READ(ctl_reg); intel_panel_set_backlight(dev, dev_priv->backlight_level); } @@ -136,8 +134,7 @@ static void intel_lvds_disable(struct intel_lvds *intel_lvds) intel_lvds->pfit_dirty = true; } - I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN); - POSTING_READ(lvds_reg); + POSTING_READ(ctl_reg); } static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)