On Fri, Jan 20, 2012 at 11:09:29PM +0200, Pasi Kärkkäinen wrote: > 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 > > > <seth.forshee@xxxxxxxxxxxxx> wrote: > > > > I'm seeing several issues related to the radeon driver on a MacBook Pro > > > > 8,2 with the following graphics card: > > > > > > > > ATI Technologies Inc Whistler [AMD Radeon HD 6600M Series] [1002:6741] > > > > > > > > All problems were observed when using kernel version 3.2.1. None are > > > > seen when using fglrx. > > > > > > > > 1. Excessive power draw. When using the radeon driver ACPI reports a > > > > power draw of about 30W on an idle desktop. Using fglrx brings this > > > > number down to 15W. > > > > > > The power saving features of the open source driver are not yet as > > > good as the closed source driver. Please see the power management > > > section of this page (http://wiki.x.org/wiki/RadeonFeature) for more > > > info on the options currently available. > > > > The dynpm option makes a small difference, saving about 2W. I did notice > > an ocassional flash on the screen with this option, and the same flash > > each time I changed the power options. > > > > Btw how do you measure the power draw? You can get the instantaneous rate from the data under /proc/acpi/battery, but I use a tool called powerstat [1], written by my 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=cking/powerstat.git _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
