From mboxrd@z Thu Jan 1 00:00:00 1970 From: Seth Forshee Subject: Re: radeon issues on MacBook Pro 8,2 Date: Fri, 20 Jan 2012 17:26:44 -0600 Message-ID: <20120120232644.GB2292@ubuntu-macmini> References: <20120119171808.GB23144@ubuntu-macmini> <20120119205317.GC23144@ubuntu-macmini> <20120120210929.GX12984@reaktio.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <20120120210929.GX12984@reaktio.net> Sender: linux-kernel-owner@vger.kernel.org To: Pasi =?utf-8?B?S8Okcmtrw6RpbmVu?= Cc: Alex Deucher , Dave Airlie , Alex Deucher , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Seth Forshee , Colin King List-Id: dri-devel@lists.freedesktop.org On Fri, Jan 20, 2012 at 11:09:29PM +0200, Pasi K=C3=A4rkk=C3=A4inen wro= te: > On Thu, Jan 19, 2012 at 02:53:17PM -0600, Seth Forshee wrote: > > On Thu, Jan 19, 2012 at 02:48:52PM -0500, Alex Deucher wrote: > > > On Thu, Jan 19, 2012 at 12:18 PM, Seth Forshee > > > wrote: > > > > I'm seeing several issues related to the radeon driver on a Mac= Book Pro > > > > 8,2 with the following graphics card: > > > > > > > > =C2=A0ATI Technologies Inc Whistler [AMD Radeon HD 6600M Series= ] [1002:6741] > > > > > > > > All problems were observed when using kernel version 3.2.1. Non= e are > > > > seen when using fglrx. > > > > > > > > =C2=A01. Excessive power draw. When using the radeon driver ACP= I reports a > > > > =C2=A0 =C2=A0power draw of about 30W on an idle desktop. Using = fglrx brings this > > > > =C2=A0 =C2=A0number down to 15W. > > >=20 > > > The power saving features of the open source driver are not yet a= s > > > good as the closed source driver. Please see the power managemen= t > > > section of this page (http://wiki.x.org/wiki/RadeonFeature) for m= ore > > > info on the options currently available. > >=20 > > The dynpm option makes a small difference, saving about 2W. I did n= otice > > an ocassional flash on the screen with this option, and the same fl= ash > > each time I changed the power options. > >=20 >=20 > Btw how do you measure the power draw?=20 You can get the instantaneous rate from the data under /proc/acpi/battery, but I use a tool called powerstat [1], written by m= y colleague Colin King. The advantage of powerstat is that it samples the ACPI data over a period of time and reports the average and standard deviation. That way I have a better idea of how much power is really being drawn and the quality of the value reported. [1] http://kernel.ubuntu.com/git?p=3Dcking/powerstat.git