From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joseph Salisbury Subject: Re: [4.4-rc1][Regression] drm/i915: Check live status before reading edid Date: Thu, 25 Feb 2016 13:41:44 -0500 Message-ID: <56CF4AE8.6020706@canonical.com> References: <56CE22DB.6050108@canonical.com> <000C66961D35964B9714611E548C10AD0C3FF620@BGSMSX104.gar.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <000C66961D35964B9714611E548C10AD0C3FF620@BGSMSX104.gar.corp.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: "Jindal, Sonika" Cc: David Airlie , Daniel Vetter , intel-gfx , LKML , "oleksandr@natalenko.name" , dri-devel , "Vivi, Rodrigo" List-Id: dri-devel@lists.freedesktop.org T24gMDIvMjQvMjAxNiAxMDo1MyBQTSwgSmluZGFsLCBTb25pa2Egd3JvdGU6Cj4gSGkgSm9lLAo+ Cj4gWWVzLCBmaXJzdCB0aGluZyB0byB0cnkgaXMgdG8gaW5jcmVhc2UgdGhlIHRyaWVzLgpXZSB0 ZXN0aW5nIHdpdGggMzAwIHJldHJpZXMsIGJ1dCB0aGUgc2Vjb25kIG1vbml0b3Igc3RpbGwgZGlk IG5vdCBzaG93CnVwLiAgSG93ZXZlciwgaXQgZGlkIHNob3cgdXAgaW4gbHNwY2kuCgoKPiBDYW4g eW91IHBsZWFzZSBwb2ludCBtZSB0byB0aGUgYnVnIGFuZCBwcm92aWRlIG1vcmUgZGV0YWlscyBs aWtlIHBsYXRmb3JtLCBtb25pdG9yLCBjYWJsZS4KVGhlIGJ1ZyBpcyBhdDogaHR0cDovL3BhZC5s di8xNTQzNjgzIC4gIEFsbCB0aGUgaGFyZHdhcmUgZGV0YWlscyBzaG91bGQKYmUgaW4gdGhlIGJ1 ZyByZXBvcnQuICBUaGUgY2FibGUgaXMgYSBzaW5nbGUgbGluayBkdmktZCBjYWJsZS4gClVuZm9y dHVuYXRlbHkgdGhlIGJ1ZyByZXBvcnRlciBkb2VzIG5vdCBoYXZlIGEgZHVhbCBsaW5rIGNhYmxl IHRvIHRlc3QuCklmIHlvdSBuZWVkIGFueSBhZGRpdGlvbmFsIGluZm8sIHdlIGNhbiBhc2sgdGhl IGJ1ZyByZXBvcnRlci4KPiBBcmUgeW91IHJlZmVycmluZyB0byB0aGUgc2FtZSBpc3N1ZSBhcyBP bGVrc2FuZHIgcmVwb3J0ZWQgd2hlcmUgYSBzaW5nbGUgbGluayBkdmkvaGRtaSBjYWJsZSBkaWRu 4oCZdCB3b3JrIGFuZCBkdWFsIGxpbmsgd29ya2VkPwpJJ20gbm90IHN1cmUgaWYgdGhpcyBpcyB0 aGUgZXhhY3QgaXNzdWUgb3Igbm90LiAgSSdsbCByZXZpZXcgdGhlIG90aGVyCnRocmVhZCBhbmQg Y29tcGFyZS4KCj4KPiBSZWdhcmRzLAo+IFNvbmlrYQo+Cj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdl LS0tLS0KPiBGcm9tOiBKb3NlcGggU2FsaXNidXJ5IFttYWlsdG86am9zZXBoLnNhbGlzYnVyeUBj YW5vbmljYWwuY29tXSAKPiBTZW50OiBUaHVyc2RheSwgRmVicnVhcnkgMjUsIDIwMTYgMzowOSBB TQo+IFRvOiBKaW5kYWwsIFNvbmlrYSA8c29uaWthLmppbmRhbEBpbnRlbC5jb20+Cj4gQ2M6IFNo YXJtYSwgU2hhc2hhbmsgPHNoYXNoYW5rLnNoYXJtYUBpbnRlbC5jb20+OyBWaXZpLCBSb2RyaWdv IDxyb2RyaWdvLnZpdmlAaW50ZWwuY29tPjsgRGFuaWVsIFZldHRlciA8ZGFuaWVsLnZldHRlckBm ZndsbC5jaD47IEphbmkgTmlrdWxhIDxqYW5pLm5pa3VsYUBsaW51eC5pbnRlbC5jb20+OyBEYXZp ZCBBaXJsaWUgPGFpcmxpZWRAbGludXguaWU+OyBpbnRlbC1nZnggPGludGVsLWdmeEBsaXN0cy5m cmVlZGVza3RvcC5vcmc+OyBkcmktZGV2ZWwgPGRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5v cmc+OyBMS01MIDxsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnPgo+IFN1YmplY3Q6IFs0LjQt cmMxXVtSZWdyZXNzaW9uXSBkcm0vaTkxNTogQ2hlY2sgbGl2ZSBzdGF0dXMgYmVmb3JlIHJlYWRp bmcgZWRpZAo+Cj4gSGkgU29uaWthLAo+Cj4gQSBrZXJuZWwgYnVnIHJlcG9ydCB3YXMgb3BlbmVk IGFnYWluc3QgVWJ1bnR1IFswXS4gIEFmdGVyIGEga2VybmVsIGJpc2VjdCwgaXQgd2FzIGZvdW5k IHRoYXQgcmV2ZXJ0aW5nIHRoZSBmb2xsb3dpbmcgY29tbWl0IHJlc29sdmVkIHRoaXMgYnVnOgo+ Cj4gY29tbWl0IDIzN2VkODZjNjkzZDhhOGU0ZGI0NzY5NzZhZWIzMGRmNGRlYWM3NGIKPiBBdXRo b3I6IFNvbmlrYSBKaW5kYWwgPHNvbmlrYS5qaW5kYWxAaW50ZWwuY29tPgo+IERhdGU6ICAgVHVl IFNlcCAxNSAwOTo0NDoyMCAyMDE1ICswNTMwCj4KPiAgICAgZHJtL2k5MTU6IENoZWNrIGxpdmUg c3RhdHVzIGJlZm9yZSByZWFkaW5nIGVkaWQKPgo+Cj4KPiBUaGUgcmVncmVzc2lvbiB3YXMgaW50 cm9kdWNlZCBhcyBvZiB2NC40LXJjMS4KPgo+IEkgd2FzIGhvcGluZyB0byBnZXQgeW91ciBmZWVk YmFjaywgc2luY2UgeW91IGFyZSB0aGUgcGF0Y2ggYXV0aG9yLiAgRG8gdGhpbmsgaW5jcmVhc2lu ZyB0aGUgbnVtYmVyIG9mIHRyaWVzIGluIGludGVsX2hkbWlfZGV0ZWN0KCkgaXMgd29ydGggdHJ5 aW5nPyAgRG8geW91IHRoaW5rIGdhdGhlcmluZyBhbnkgYWRkaXRpb25hbCBkYXRhIHdpbGwgaGVs cCBkaWFnbm9zZSB0aGlzIGlzc3VlLCBvciB3b3VsZCBpdCBiZSBiZXN0IHRvIHN1Ym1pdCBhIHJl dmVydCByZXF1ZXN0Pwo+ICAgICAKPgo+IFRoYW5rcywKPiAgICAgCj4gSm9lCj4KPiBbMF0gaHR0 cDovL3BhZC5sdi9scDE1NDM2ODMKPgoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCkludGVsLWdmeCBtYWlsaW5nIGxpc3QKSW50ZWwtZ2Z4QGxpc3RzLmZy ZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3Rp bmZvL2ludGVsLWdmeAo= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933596AbcBYSlw (ORCPT ); Thu, 25 Feb 2016 13:41:52 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:39753 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933353AbcBYSlt convert rfc822-to-8bit (ORCPT ); Thu, 25 Feb 2016 13:41:49 -0500 Subject: Re: [4.4-rc1][Regression] drm/i915: Check live status before reading edid To: "Jindal, Sonika" References: <56CE22DB.6050108@canonical.com> <000C66961D35964B9714611E548C10AD0C3FF620@BGSMSX104.gar.corp.intel.com> Cc: "Sharma, Shashank" , "Vivi, Rodrigo" , Daniel Vetter , Jani Nikula , David Airlie , intel-gfx , dri-devel , LKML , "oleksandr@natalenko.name" From: Joseph Salisbury X-Enigmail-Draft-Status: N1110 Message-ID: <56CF4AE8.6020706@canonical.com> Date: Thu, 25 Feb 2016 13:41:44 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <000C66961D35964B9714611E548C10AD0C3FF620@BGSMSX104.gar.corp.intel.com> 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 02/24/2016 10:53 PM, Jindal, Sonika wrote: > Hi Joe, > > Yes, first thing to try is to increase the tries. We testing with 300 retries, but the second monitor still did not show up. However, it did show up in lspci. > Can you please point me to the bug and provide more details like platform, monitor, cable. The bug is at: http://pad.lv/1543683 . All the hardware details should be in the bug report. The cable is a single link dvi-d cable. Unfortunately the bug reporter does not have a dual link cable to test. If you need any additional info, we can ask the bug reporter. > Are you referring to the same issue as Oleksandr reported where a single link dvi/hdmi cable didn’t work and dual link worked? I'm not sure if this is the exact issue or not. I'll review the other thread and compare. > > Regards, > Sonika > > -----Original Message----- > From: Joseph Salisbury [mailto:joseph.salisbury@canonical.com] > Sent: Thursday, February 25, 2016 3:09 AM > To: Jindal, Sonika > Cc: Sharma, Shashank ; Vivi, Rodrigo ; Daniel Vetter ; Jani Nikula ; David Airlie ; intel-gfx ; dri-devel ; LKML > Subject: [4.4-rc1][Regression] drm/i915: Check live status before reading edid > > Hi Sonika, > > A kernel bug report was opened against Ubuntu [0]. After a kernel bisect, it was found that reverting the following commit resolved this bug: > > commit 237ed86c693d8a8e4db476976aeb30df4deac74b > Author: Sonika Jindal > Date: Tue Sep 15 09:44:20 2015 +0530 > > drm/i915: Check live status before reading edid > > > > The regression was introduced as of v4.4-rc1. > > I was hoping to get your feedback, since you are the patch author. Do think increasing the number of tries in intel_hdmi_detect() is worth trying? Do you think gathering any additional data will help diagnose this issue, or would it be best to submit a revert request? > > > Thanks, > > Joe > > [0] http://pad.lv/lp1543683 >