From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751478Ab1FREke (ORCPT ); Sat, 18 Jun 2011 00:40:34 -0400 Received: from smtp-out.google.com ([74.125.121.67]:3267 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750790Ab1FREkb (ORCPT ); Sat, 18 Jun 2011 00:40:31 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=google.com; s=beta; h=date:from:x-x-sender:to:cc:subject:in-reply-to:message-id :references:user-agent:mime-version:content-type; b=AnDPEdapX6HN8xgnYKsGiFVIvOoQHjZPMFJTShjs6uUQ2K/ChCUfeUsDTaZsZjsuoZ MDhES0i7U7547OoO77Ow== Date: Fri, 17 Jun 2011 21:40:15 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@sister.anvils To: Chris Wilson cc: Mario Kleiner , Jesse Barnes , linux-kernel@vger.kernel.org Subject: Re: [PATCH] drm/i915: Suppress spurious vblank interrupts In-Reply-To: Message-ID: References: <849307$bc24ct@azsmga001.ch.intel.com> <1296471462-8578-1-git-send-email-chris@chris-wilson.co.uk> <20110201094643.366bc073@jbarnes-desktop> <20110201100833.3219687e@jbarnes-desktop> <20110201113238.60b33ff9@jbarnes-desktop> <20110202091838.5efaa660@jbarnes-desktop> <87E55E65-72FF-462C-8BD3-84C367021DB7@tuebingen.mpg.de> User-Agent: Alpine 2.00 (LSU 1167 2008-08-23) MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="8323584-833175681-1308372025=:21481" X-System-Of-Record: true Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --8323584-833175681-1308372025=:21481 Content-Type: TEXT/PLAIN; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE On Mon, 14 Feb 2011, Hugh Dickins wrote: > On Fri, Feb 11, 2011 at 10:21 AM, Mario Kleiner > wrote: > > On Feb 8, 2011, at 8:52 PM, Hugh Dickins wrote: > >> =C2=A0It appears that the > >> underruns, while mysterious and worrisome, have litte or nothing to do > >> with the unflushed text problem which is making 2.6.38-rc unusable. > >> > I'm sorry to say that I have now given up on this: it has already > consumed a lot more time than I can afford to give it. So I've now > just turned CONFIG_DRM_I915_KMS off, which gives me a laptop on which > 2.6.38-rc is usable. >=20 > If in due course there's a likely patch someone would like me to try, > that I can do. And from time to time, with new kernels and with > upgraded userspace, I'll give I915_KMS a try again - indeed, for the > moment I still have it in my 64bit kernel. >=20 > Before switching KMS off, I did establish that, with Chris's overrun > fix, do_intel_finish_page_flip() - the function whose call to > do_gettimeofday() I moved - is no longer called at all. So that > modification was just cargo-cult magic by now (though perhaps made a > difference to timings when overruns were happening), and there's no > reason to suspect Mario's vblank patch at all. Let's assume that if I > attempted a fifth bisection, it would lead me to another (equally > blameless) patch. Nobody else is complaining: maybe my 965 is broken > and just gets along better with 2.6.38 KMS off. Just wanted to report that something (sorry, no time to work out what) in 3.0-rc1 fixed this issue for me, so now I am back on I915_KMS: thanks. Hugh --8323584-833175681-1308372025=:21481--