From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.mailbox.org ([80.241.60.212]:54847 "EHLO mx1.mailbox.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966485AbdKRMqf (ORCPT ); Sat, 18 Nov 2017 07:46:35 -0500 Received: from smtp1.mailbox.org (smtp1.mailbox.org [80.241.60.240]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.mailbox.org (Postfix) with ESMTPS id D45144834E for ; Sat, 18 Nov 2017 13:46:33 +0100 (CET) Received: from smtp1.mailbox.org ([80.241.60.240]) by spamfilter01.heinlein-hosting.de (spamfilter01.heinlein-hosting.de [80.241.56.115]) (amavisd-new, port 10030) with ESMTP id pde-BvpRlz3s for ; Sat, 18 Nov 2017 13:46:32 +0100 (CET) From: Rainer Fiebig Subject: 4.9.62: intermittent flicker after upgrade from 4.9.61 To: stable@vger.kernel.org Message-ID: Date: Sat, 18 Nov 2017 13:47:32 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: Hi! Hopefully the right addressee. Encountered two bad backports which cause screen-flicker. dmesg shows: ... [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun ... CPU: Intel Core i3 (Clarkdale/Ironlake) The backports are: - diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 49de476..277a802 100644 - diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index a19ec06..3ce9ba3 100644 After reversing them the flicker is gone, no more messages in dmesg. All else OK so far. I have also reported this here:  https://bugs.freedesktop.org/show_bug.cgi?id=103796 So long! Rainer Fiebig -- The truth always turns out to be simpler than you thought. Richard Feynman