From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:40926 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750788AbdKSKHH (ORCPT ); Sun, 19 Nov 2017 05:07:07 -0500 Date: Sun, 19 Nov 2017 11:07:12 +0100 From: Greg KH To: Rainer Fiebig Cc: stable@vger.kernel.org Subject: Re: 4.9.62: intermittent flicker after upgrade from 4.9.61 Message-ID: <20171119100712.GA25266@kroah.com> References: <20171118125100.GA32744@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: stable-owner@vger.kernel.org List-ID: On Sat, Nov 18, 2017 at 05:08:20PM +0100, Rainer Fiebig wrote: > Greg KH wrote: > > On Sat, Nov 18, 2017 at 01:47:32PM +0100, Rainer Fiebig wrote: > >> 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. > > > > So which commit was the one that caused the problem? I will be glad to > > revert it. > > > > thanks, > > > > greg k-h > > > > > > I started by reverting the more complex one first ("index > 49de476..277a802100644"). But the kernel wouldn't compile then. What git commit id is that? I don't see those ids in the 4.9-stable tree. > So I also reverted "index a19ec06..3ce9ba3 100644". After that the > kernel compiled just fine and the problems were gone (still are). Same here, what git commit id was this? thanks, greg k-h