From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jani Nikula Subject: Re: [drm] 3.18 regression: backlight dark after resume Date: Mon, 03 Nov 2014 12:34:15 +0200 Message-ID: <87wq7ch8t4.fsf@intel.com> References: <5454E2F3.2060404@odi.ch> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTP id 04E9E88E5B for ; Mon, 3 Nov 2014 02:34:23 -0800 (PST) In-Reply-To: <5454E2F3.2060404@odi.ch> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Ortwin =?utf-8?Q?Gl=C3=BCck?= , "linux-kernel@vger.kernel.org" , "intel-gfx@lists.freedesktop.org" List-Id: intel-gfx@lists.freedesktop.org T24gU2F0LCAwMSBOb3YgMjAxNCwgT3J0d2luIEdsw7xjayA8b2RpQG9kaS5jaD4gd3JvdGU6Cj4g SGksCj4KPiBTaW5jZSAzLjE4LXJjMSBiYWNrbGlnaHQgaXMgZGFyayBhZnRlciByZXN1bWUgZnJv bSBzdXNwZW5kLiBUaGlzIGlzIG9uIGEgU2Ftc3VuZyAKPiBsYXB0b3Agd2l0aCBpNSBJdnlCcmlk Z2UKPgo+IDAwOjAyLjAgVkdBIGNvbXBhdGlibGUgY29udHJvbGxlcjogSW50ZWwgQ29ycG9yYXRp b24gM3JkIEdlbiBDb3JlIHByb2Nlc3NvciAKPiBHcmFwaGljcyBDb250cm9sbGVyIChyZXYgMDkp Cj4KPgo+IEkgaGF2ZSBiaXNlY3RlZCB0aGlzIHByb2JsZW0gdG8gdGhlIGZvbGxvd2luZyBjb21t aXQ6Cj4gNzM1ODBmYjc2NGM0MjEzZDMwNWMwZDM2YmQ4Zjg1NmFlNjMxZWI0MiBpcyB0aGUgZmly c3QgYmFkIGNvbW1pdAo+IGNvbW1pdCA3MzU4MGZiNzY0YzQyMTNkMzA1YzBkMzZiZDhmODU2YWU2 MzFlYjQyCj4gQXV0aG9yOiBKYW5pIE5pa3VsYSA8amFuaS5uaWt1bGFAaW50ZWwuY29tPgo+IERh dGU6ICAgVHVlIEF1ZyAxMiAxNzoxMTo0MSAyMDE0ICswMzAwCj4KPiAgICAgIGRybS9pOTE1L2Rw OiBtYWtlIGJhY2tsaWdodCBibF9wb3dlciBjb250cm9sIHBvd2VyIHNlcXVlbmNlciBiYWNrbGln aHQKPgo+ICAgICAgVGhpcyBsZXRzIHRoZSB1c2Vyc3BhY2Ugc3dpdGNoIG9mZiB0aGUgYmFja2xp Z2h0IHVzaW5nIHRoZSBiYWNrbGlnaHQKPiAgICAgIGNsYXNzIHN5c2ZzIGJsX3Bvd2VyIGZpbGUu IFRoZSBzd2l0Y2ggaXMgZG9uZSB1c2luZyB0aGUgcG93ZXIgc2VxdWVuY2VyOwo+ICAgICAgdGhl IGJhY2tsaWdodCBQV00sIGFuZCBldmVyeXRoaW5nIGVsc2UsIHJlbWFpbnMgZW5hYmxlZC4gVGhl IGRpc3BsYXkKPiAgICAgIGJhY2tsaWdodCB3b24ndCBkcmF3IHBvd2VyLCBidXQgZm9yIG1heGlt dW0gcG93ZXIgc2F2aW5ncyB0aGUgZW5jb2Rlcgo+ICAgICAgbmVlZHMgdG8gYmUgc3dpdGNoZWQg b2ZmLgo+Cj4gICAgICBTaWduZWQtb2ZmLWJ5OiBKYW5pIE5pa3VsYSA8amFuaS5uaWt1bGFAaW50 ZWwuY29tPgo+ICAgICAgUmV2aWV3ZWRfYnk6IENsaW50b24gVGF5bG9yIDxDbGludG9uLkEuVGF5 bG9yQGludGVsLmNvbT4KPiAgICAgIFRlc3RlZF9ieTogQ2xpbnRvbiBUYXlsb3IgPENsaW50b24u QS5UYXlsb3JAaW50ZWwuY29tPgo+ICAgICAgU2lnbmVkLW9mZi1ieTogRGFuaWVsIFZldHRlciA8 ZGFuaWVsLnZldHRlckBmZndsbC5jaD4KClNlZSBodHRwczovL2J1Z3MuZnJlZWRlc2t0b3Aub3Jn L3Nob3dfYnVnLmNnaT9pZD04MDc3MyAocGxlYXNlIGlnbm9yZQpjb21tZW50cyB1cCB0byAjMTAg b3Igc28pLgoKUGxlYXNlIGF0dGFjaCBkbWVzZyB3aXRoIGRybS5kZWJ1Zz0xNCBtb2R1bGUgcGFy YW1ldGVyIHNldCwgZnJvbSBib290IHRvCnN1c3BlbmQvcmVzdW1lIGFuZCB0aGUgcHJvYmxlbSwg cnVubmluZyB0aGUgZGVidWcgcGF0Y2ggZnJvbSBjb21tZW50CiMxOC4gUHJlZmVycmFibHkgcGxl YXNlIGF0dGFjaCB0aGUgZG1lc2cgb24gdGhlIGJ1ZyB0byBrZWVwIGV2ZXJ5dGhpbmcKaW4gb25l IHBsYWNlLgoKVGhhbmtzLApKYW5pLgoKCi0tIApKYW5pIE5pa3VsYSwgSW50ZWwgT3BlbiBTb3Vy Y2UgVGVjaG5vbG9neSBDZW50ZXIKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdApJbnRlbC1nZnhAbGlzdHMuZnJlZWRl c2t0b3Aub3JnCmh0dHA6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9p bnRlbC1nZngK From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751948AbaKCKeZ (ORCPT ); Mon, 3 Nov 2014 05:34:25 -0500 Received: from mga14.intel.com ([192.55.52.115]:55158 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751547AbaKCKeY convert rfc822-to-8bit (ORCPT ); Mon, 3 Nov 2014 05:34:24 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,307,1413270000"; d="scan'208";a="615933691" From: Jani Nikula To: Ortwin =?utf-8?Q?Gl=C3=BCck?= , "linux-kernel\@vger.kernel.org" , "intel-gfx\@lists.freedesktop.org" Subject: Re: [drm] 3.18 regression: backlight dark after resume In-Reply-To: <5454E2F3.2060404@odi.ch> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <5454E2F3.2060404@odi.ch> User-Agent: Notmuch/0.18.2+151~g6d88668 (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu) Date: Mon, 03 Nov 2014 12:34:15 +0200 Message-ID: <87wq7ch8t4.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 01 Nov 2014, Ortwin Glück wrote: > Hi, > > Since 3.18-rc1 backlight is dark after resume from suspend. This is on a Samsung > laptop with i5 IvyBridge > > 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor > Graphics Controller (rev 09) > > > I have bisected this problem to the following commit: > 73580fb764c4213d305c0d36bd8f856ae631eb42 is the first bad commit > commit 73580fb764c4213d305c0d36bd8f856ae631eb42 > Author: Jani Nikula > Date: Tue Aug 12 17:11:41 2014 +0300 > > drm/i915/dp: make backlight bl_power control power sequencer backlight > > This lets the userspace switch off the backlight using the backlight > class sysfs bl_power file. The switch is done using the power sequencer; > the backlight PWM, and everything else, remains enabled. The display > backlight won't draw power, but for maximum power savings the encoder > needs to be switched off. > > Signed-off-by: Jani Nikula > Reviewed_by: Clinton Taylor > Tested_by: Clinton Taylor > Signed-off-by: Daniel Vetter See https://bugs.freedesktop.org/show_bug.cgi?id=80773 (please ignore comments up to #10 or so). Please attach dmesg with drm.debug=14 module parameter set, from boot to suspend/resume and the problem, running the debug patch from comment #18. Preferrably please attach the dmesg on the bug to keep everything in one place. Thanks, Jani. -- Jani Nikula, Intel Open Source Technology Center