From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: Speedstep centrino Date: Fri, 02 Feb 2007 13:25:41 -0800 Message-ID: <45C3AC55.9010004@goop.org> References: <736dda5d0701221243o5a096240v1142ccdf9133f1f@mail.gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <736dda5d0701221243o5a096240v1142ccdf9133f1f@mail.gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@lists.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=m.gmane.org+glkc-cpufreq=m.gmane.org@lists.linux.org.uk Content-Type: text/plain; charset="us-ascii" To: David Tunkrans Cc: cpufreq@lists.linux.org.uk David Tunkrans wrote: > I found your email adress in the speedstep centrino kernel source. Ive > put down a lot of time into getting ACPI and speedstep working on my > Mac Pro Ubuntu amd64 installation, with no success. Seems like the > cpufreq parameters are "missing" even though the specification says > that woodcrest Xeons do support speedstep. Also I suspect that there > has to be specific support for Xeon processors in this driver? I would > really appreciate if you could point me in the right direction. In general, the newer CPUs require ACPI support to get the right operating point parameters for the CPU; only the older Banias Pentium M's have support built directly into the driver. I don't know if Mac Pros have ACPI; perhaps there needs to be some other way of getting that info out of the BIOS, assuming its there at all. J