From owner-freebsd-x11@freebsd.org Mon Mar 14 16:48:41 2016 Return-Path: Delivered-To: freebsd-x11@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C3566AD00F5 for ; Mon, 14 Mar 2016 16:48:41 +0000 (UTC) (envelope-from am_dxer@fastmail.fm) Received: from out4-smtp.messagingengine.com (out4-smtp.messagingengine.com [66.111.4.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 9BA18D5C for ; Mon, 14 Mar 2016 16:48:41 +0000 (UTC) (envelope-from am_dxer@fastmail.fm) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id 898DE2197D for ; Mon, 14 Mar 2016 12:48:34 -0400 (EDT) Received: from web4 ([10.202.2.214]) by compute5.internal (MEProxy); Mon, 14 Mar 2016 12:48:34 -0400 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=fastmail.fm; h= content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to:x-sasl-enc:x-sasl-enc; s=mesmtp; bh=V1F FKo6wrkeB4rWMcIQHfwqaVEo=; b=YT9jFAVYWHwNo04/x51Qs9TKydRX5LCl/A2 zR9eraACYAaYul2Nfr+OiwBlHHrGKvE8ZGbKI0Zf8Tr6FLWUHtTweAt1bwM9Rmxr auR2CCB/2D3QOHWnWLZGTqCWH940Ek7LrNvRRTjkHJUMCJ8kijWmAKsjk2AvbTnz gnfnX9P8= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-sasl-enc :x-sasl-enc; s=smtpout; bh=V1FFKo6wrkeB4rWMcIQHfwqaVEo=; b=Vsqw4 4B3o56sDF3t0M6r1d9NK4sc9MpM0OZGrAW8RUUyRP1mrhIHWaBfmR6QTrdL85v3Z 5LeKYmDOxollpFtyYYC1e07EMy4BRolp2kIBLduMNIbJd6zw7ZpMjH8MhOs9F/Ym xDSp0ToiAKJc7dUqwldehxw4cQ2cxFPl4n/dIM= Received: by web4.nyi.internal (Postfix, from userid 99) id 5B68711027F; Mon, 14 Mar 2016 12:48:34 -0400 (EDT) Message-Id: <1457974114.3576662.548762770.0E1628BF@webmail.messagingengine.com> X-Sasl-Enc: p6a5jtx5smid8ECZebxVx+Qtv+Q+M1/jvw00A5evHiBF 1457974114 From: am_dxer@fastmail.fm To: freebsd-x11@FreeBSD.org MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain X-Mailer: MessagingEngine.com Webmail Interface - html Subject: i915 update to Linux 3.8 ready! Date: Mon, 14 Mar 2016 12:48:34 -0400 X-BeenThere: freebsd-x11@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: X11 on FreeBSD -- maintaining and support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Mar 2016 16:48:41 -0000 On 9 March 2016 at 22:02, Ed Maste wrote: >> >> I found reports that Linux introduced a regression on Sandy Bridge >> power consumption sometime around Linux 3.6 that was fixed after 3.8. >> Those reports are specifically for an increase after a suspend-resume >> cycle; something gets confused and causes the GPU to never enter rc6. >> It's not exactly the same symptom, as I see increased consumption >> after reboot and loading i915 (before starting X), but certainly seems >> related. >> >> Anyhow, with that patch applied after a suspend-resume cycle I'm back >> to a reasonable power consumption -- around 15W in X with Firefox >> running. The patch is in https://reviews.freebsd.org/D5599. > Some further testing suggests the power consumption's back to normal > after a suspend+resume cycle, without the patch in D5599. I may have > mixed up something in my experiment yesterday or perhaps there's some > intermittent behaviour. > If anyone else has Sandy Bridge laptops (Thinkpad X220, T420 etc.) I'd > really appreciate hearing about test results. On an HP EliteBook 2560p with the Sandy Bridge Core i7-2620M processor, I have about a 5 watt power increase when loading the KMS driver from head as opposed to when using vesa. I have enabled the rc6 states in loader.conf and dmesg output shows them as being enabled. I am testing from within the Mate Desktop environment. Doing any tests on consoles as you have done is a bit challenging for me because I am totally blind and use a screen reader called Orca that only works within a graphical environment.