From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jani Nikula Subject: Re: i915: black screen after boot on 915GM (Linux >= 3.4-rc1) Date: Fri, 14 Mar 2014 07:42:54 +0200 Message-ID: <87ob195o9t.fsf@intel.com> References: <20140313083839.GA2396@shrek.podlesie.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id 32C9AFA5A1 for ; Thu, 13 Mar 2014 22:43:47 -0700 (PDT) In-Reply-To: <20140313083839.GA2396@shrek.podlesie.net> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org To: Krzysztof Mazur , Ville =?utf-8?B?U3lyasOkbMOk?= , Daniel Vetter Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org List-Id: intel-gfx@lists.freedesktop.org On Thu, 13 Mar 2014, Krzysztof Mazur wrote: > Hi, > > The commit 3f2dc5ac05714711fc14f2bf0ee5e42d5c08c581 (drm/i915: Fix 915GM > self-refresh enable/disable) causes strange regression on the HP Compaq > nc6120. During and after boot to framebuffer console with just LVDS > the screen is black (backlight on, but black). Starting a X server fixes > the problem. Connecting an external VGA monitor also fixes the problem. > > Reverting this commit fixes the problem at least up to Linux 3.14.0-rc6. > > I'm still using ACPI video problem workaround that effectively does: > > static int acpi_video_bus_start_devices(struct acpi_video_bus *video) > { > - return acpi_video_bus_DOS(video, 0, > + return acpi_video_bus_DOS(video, 3, > acpi_osi_is_win8() ? 1 : 0); > } > > in drivers/acpi/video.c. > > I've added dmesgs from the last good commit and the bad commit at: > https://bugs.freedesktop.org/show_bug.cgi?id=76103 We track this on the bugzilla. Please add any new information (such as the other patches you have) there. Thanks. BR, Jani. -- Jani Nikula, Intel Open Source Technology Center