Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757306Ab1FPHiW (ORCPT ); Thu, 16 Jun 2011 03:38:22 -0400 Received: from alice.et.bocholt.fh-gelsenkirchen.de ([193.175.197.63]:47995 "EHLO alice.et.bocholt.fh-gelsenkirchen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751721Ab1FPHiP (ORCPT ); Thu, 16 Jun 2011 03:38:15 -0400 X-DKIM: Sendmail DKIM Filter v2.8.3 alice.et.bocholt.fh-gelsenkirchen.de p5G7c61M027479 From: Dirk Gouders To: Jesse Barnes Cc: linux-kernel@vger.kernel.org, Chris Wilson Subject: Re: [2.6.39] drm/i915: blank screen on Lenovo Ideapad U160 In-Reply-To: <20110615150737.79cd5de7@jbarnes-desktop> (Jesse Barnes's message of "Wed, 15 Jun 2011 15:07:37 -0700") References:

<20110615115903.685acba0@jbarnes-desktop> <20110615144132.074167f3@jbarnes-desktop> <20110615150737.79cd5de7@jbarnes-desktop> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) Date: Thu, 16 Jun 2011 09:38:05 +0200 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Greylist: Sender succeeded STARTTLS authentication, not delayed by milter-greylist-4.2.3 (alice.et.bocholt.fh-gelsenkirchen.de [192.168.0.63]); Thu, 16 Jun 2011 09:38:06 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3754 Lines: 85 Jesse Barnes writes: > On Thu, 16 Jun 2011 00:03:38 +0200 > Dirk Gouders wrote: > >> Jesse Barnes writes: >> >> > Oh is this not an LVDS panel? I'm curious which of the port disables >> > is at fault in your config then. If you have an eDP panel, it would >> > likely be the PCH_DP_D write. It could be a side effect of the >> > PANEL_UNLOCK_REGS write as well though, can you try commenting each of >> > those out? >> >> Yes, you are right. Commenting out a single line helps: >> >> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c >> index 81a9059..ed95cbf 100644 >> --- a/drivers/gpu/drm/i915/intel_display.c >> +++ b/drivers/gpu/drm/i915/intel_display.c >> @@ -1356,7 +1356,7 @@ static void intel_disable_pch_ports(struct drm_i915_private *dev_priv, >> u32 reg, val; >> >> val = I915_READ(PCH_PP_CONTROL); >> - I915_WRITE(PCH_PP_CONTROL, val | PANEL_UNLOCK_REGS); >> + //I915_WRITE(PCH_PP_CONTROL, val | PANEL_UNLOCK_REGS); >> >> disable_pch_dp(dev_priv, pipe, PCH_DP_B); >> disable_pch_dp(dev_priv, pipe, PCH_DP_C); > > Ok interesting, that means one of the locked regs we're trying to write > later is the real culprit for this issue... those include the LVDS reg > and the panel timing regs. I'll see if I can figure out which one > might be the problem. Thanks a lot for your help. Perhaps this information is helpful: with the above change, a trace is generated during boot: ------------[ cut here ]------------ WARNING: at drivers/gpu/drm/i915/intel_display.c:1020 ironlake_crtc_disable+0x65 4/0x124c() Hardware name: 08946MG PCH LVDS enabled on transcoder A, should be disabled Modules linked in: Pid: 1, comm: swapper Not tainted 3.0.0-rc3-00055-gada9c93-dirty #6 Call Trace: [] ? warn_slowpath_common+0x78/0x8c [] ? warn_slowpath_fmt+0x45/0x4a [] ? ironlake_crtc_disable+0x654/0x124c [] ? intel_panel_set_backlight+0x3e/0x2b7 [] ? intel_crtc_dpms+0x38/0xfd [] ? intel_crtc_disable+0x1a/0x4f [] ? drm_helper_disable_unused_functions+0xd0/0xfb [] ? intel_modeset_init+0x1500/0x15c0 [] ? i915_driver_load+0xc0d/0x13d9 [] ? drm_get_minor+0x22b/0x288 [] ? drm_get_pci_dev+0x149/0x253 [] ? _raw_spin_lock_irqsave+0x16/0x34 [] ? local_pci_probe+0x49/0x95 [] ? pci_device_probe+0xc4/0xf3 [] ? driver_sysfs_add+0x66/0x8d [] ? driver_probe_device+0xa8/0x138 [] ? __driver_attach+0x4f/0x6f [] ? driver_probe_device+0x138/0x138 [] ? bus_for_each_dev+0x47/0x72 [] ? bus_add_driver+0xae/0x1fe [] ? drm_core_init+0x121/0x121 [] ? driver_register+0x8d/0xf5 [] ? drm_core_init+0x121/0x121 [] ? __pci_register_driver+0x50/0xbb [] ? drm_core_init+0x121/0x121 [] ? do_one_initcall+0x78/0x12b [] ? kernel_init+0xa8/0x126 [] ? kernel_thread_helper+0x4/0x10 [] ? start_kernel+0x337/0x337 [] ? gs_change+0xb/0xb ---[ end trace bb2314f7f28ba213 ]--- Dirk -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/