From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751719AbZJHDpP (ORCPT ); Wed, 7 Oct 2009 23:45:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750832AbZJHDpO (ORCPT ); Wed, 7 Oct 2009 23:45:14 -0400 Received: from mail-bw0-f210.google.com ([209.85.218.210]:59219 "EHLO mail-bw0-f210.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750927AbZJHDpN convert rfc822-to-8bit (ORCPT ); Wed, 7 Oct 2009 23:45:13 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=K8FJahQt/pLvPGklDt+scxjoSoKrCln0ZNYI3e0SF/VUXs/3FGLF9jRe5zLYtB2nuX tEMflERZVaY9JPstZcq7kQ2I/GvLxLClTPG4m64wdkloN3BP/yReVllH80SZBhfOzJJC nH09qDofngVOxqJ6OC+D3p87KetjK/xUUSLio= MIME-Version: 1.0 In-Reply-To: <20091005092148.4341d9ab@jbarnes-g45> References: <20091005092148.4341d9ab@jbarnes-g45> Date: Wed, 7 Oct 2009 23:44:35 -0400 X-Google-Sender-Auth: 3c09291dd0fec03e Message-ID: Subject: Re: [resend] i915: high power consumption after suspend/resume From: Andrew Lutomirski To: Jesse Barnes Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.sf.net Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 5, 2009 at 12:21 PM, Jesse Barnes wrote: > On Sat, 3 Oct 2009 12:50:01 -0400 > Andrew Lutomirski wrote: > >> [resend b/c the intel-gfx list doesn't allow non-member posting] >> >> Hi- >> >> First, thanks for all the great work on i915's power saving features >> -- power consumption on my laptop (Lenovo X200s) is now almost as low >> on Linux as on Windows. >> >> After a suspend/resume cycle, though, my power consumption usually >> goes up by over a watt.  I think this is due to i915, because of an >> experiment I did: >> >> 1. Boot with modesetting off into single user mode. >> 2. Suspend and resume >> 3. Reload i915 with modesetting on.  Power consumption is low. >> 4. Suspend and resume.  Power consumption is high. >> 5. Unbind and rebind i915.  Power consumption is high. >> 6. Suspend.  System hangs (seperate bug, I guess). >> >> I get similar results if I boot single user with modesetting on: power >> consumption is low, becomes high after suspend/resume, and goes low >> again after rebinding i915. >> >> This is on 2.6.32-rc1 + a little (i.e. 84d88d5d4e from Linus' tree >> plus an ext4 fix).  I'm having trouble reproducing any of this on >> 2.6.31. > > I probably need to save/restore some more of the power saving state > across suspend/resume...  Can you file a bug for this at > bugs.freedesktop.org so it doesn't get lost? Submitted as https://bugs.freedesktop.org/show_bug.cgi?id=24386 Thanks, Andy