From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C7ACAC742A1 for ; Thu, 11 Jul 2019 20:11:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 985EB20872 for ; Thu, 11 Jul 2019 20:11:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="Wab+479U"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="xctQD5ll" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728909AbfGKUL2 (ORCPT ); Thu, 11 Jul 2019 16:11:28 -0400 Received: from bedivere.hansenpartnership.com ([66.63.167.143]:40052 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728194AbfGKUL1 (ORCPT ); Thu, 11 Jul 2019 16:11:27 -0400 Received: from localhost (localhost [127.0.0.1]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id F412F8EE2F6; Thu, 11 Jul 2019 13:11:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=hansenpartnership.com; s=20151216; t=1562875887; bh=eJpN0hT0dPASpoxiTeZeS1Zqd+8dvu3pAn+RAEai40M=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=Wab+479UlzvH9iwSvlN/IS2yjRiE7OP9+DO69A/Ac8uIy9bkzkCgfkuM7n4iV/j9c 98lE5jCz4EnZje3RzMAge2jVt6vngXbQuAvKk13eSJFyb1YGp2VqU9wiBQLBCrmfAI t2BK+nIY/Q94Q4s12onIvMX7cIboHyeFkPVZPh9c= Received: from bedivere.hansenpartnership.com ([127.0.0.1]) by localhost (bedivere.hansenpartnership.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E4R7mDdzXBLo; Thu, 11 Jul 2019 13:11:26 -0700 (PDT) Received: from jarvis.lan (unknown [50.35.68.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by bedivere.hansenpartnership.com (Postfix) with ESMTPSA id 4140B8EE0C7; Thu, 11 Jul 2019 13:11:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=hansenpartnership.com; s=20151216; t=1562875886; bh=eJpN0hT0dPASpoxiTeZeS1Zqd+8dvu3pAn+RAEai40M=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=xctQD5llf5gK0Kt5CvU3qA2xkq/+WlSWMLSJ39J5pQ0RtP7Ow5sCXLIHSYb6meUxJ nyYX2lhHtH0Hg8KQyIPJVTuIldHUx99dhPLhGo5E+fyfmR2eLZAg3fCIYCoo5FxTCA Ma/ZxwsMepru1EEM5snfVgZy50R7ridZ66kQQ2/A= Message-ID: <1562875878.2840.0.camel@HansenPartnership.com> Subject: Re: screen freeze with 5.2-rc6 Dell XPS-13 skylake i915 From: James Bottomley To: Chris Wilson , intel-gfx@lists.freedesktop.org Cc: linux-kernel Date: Thu, 11 Jul 2019 13:11:18 -0700 In-Reply-To: <156283735757.12757.8954391372130933707@skylake-alporthouse-com> References: <1561834612.3071.6.camel@HansenPartnership.com> <156283735757.12757.8954391372130933707@skylake-alporthouse-com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2019-07-11 at 10:29 +0100, Chris Wilson wrote: > Quoting James Bottomley (2019-06-29 19:56:52) > > The symptoms are really weird: the screen image is locked in > > place. The machine is still functional and if I log in over the > > network can do anything I like, including killing the X server and > > the display will never alter. It also seems that the system is > > accepting keyboard input because when it freezes I can cat > > information to a file (if the mouse was over an xterm) and verify > > over the network the file contents. Nothing unusual appears in > > dmesg when the lockup happens. > > > > The last kernel I booted successfully on the system was 5.0, so > > I'll try compiling 5.1 to narrow down the changes. > > It's likely this is panel self-refresh going haywire. > > commit 8f6e87d6d561f10cfa48a687345512419839b6d8 > Author: José Roberto de Souza > Date: Thu Mar 7 16:00:50 2019 -0800 > > drm/i915: Enable PSR2 by default > > The support for PSR2 was polished, IGT tests for PSR2 was added > and > it was tested performing regular user workloads like browsing, > editing documents and compiling Linux, so it is time to enable it > by > default and enjoy even more power-savings. > > Temporary workaround would be to set i915.enable_psr=0 It looks plausible. I have to say I was just about to mark a bisect containing this as good, but that probably reflects my difficulty reproducing the issue. James