From mboxrd@z Thu Jan 1 00:00:00 1970 From: Borislav Petkov Subject: Re: [arch-general] powernow-k8 fails to load with linux 3.7.2 Date: Fri, 18 Jan 2013 12:37:17 +0100 Message-ID: <20130118113717.GA6808@pd.tnic> References: <20130115224755.085aa6b7@bluemoon> <20130116131725.4e590c34@bluemoon> <1448223.sdUJnNSRz4@vostro.rjw.lan> <20130116231728.GA10204@x1.alien8.de> <20130116181600.4c48ee3b@bluemoon> <20130117094648.GD30700@pd.tnic> <20130117194044.7a18a29d@bluemoon> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Return-path: Content-Disposition: inline In-Reply-To: <20130117194044.7a18a29d@bluemoon> Sender: cpufreq-owner@vger.kernel.org To: Leonid Isaev Cc: "Rafael J. Wysocki" , Tom Gundersen , =?utf-8?B?QW5kcsOp?= Przywara , Matthew Garrett , cpufreq@vger.kernel.org, linux-acpi@vger.kernel.org List-Id: linux-acpi@vger.kernel.org On Thu, Jan 17, 2013 at 07:40:44PM -0600, Leonid Isaev wrote: > Arrh, modprobe still does not exit cleanly with this... As I said already above: >> That's correct - we say ENODEV on your CPU which supports hardware >> P-states and hand off to acpi-cpufreq which has that functionality >> now. It is supposed to work that way: we return an error from the powernow-k8 init function so that it doesn't load but hand off to acpi-cpufreq so that it gets loaded instead. > > But, we also have the CPU autoprobing deal: > > > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=644e9cbbe3fc032cc92d0936057e166a994dc246 > > > > so, *actually*, powernow-k8 should be loaded by default. I dunno, maybe > > upgrade udev on your distro? > > Udev 196 and 197 + linux <= 3.6.11 yield correct CPU autoprobing. However, > udev 197 + linux 3.7.2 do not. I haven't tested udev 196 with 3.7.2 though, > but it does not look like a udev issue. Hmm, I'll bet this has something to do with the fact that HW_PSTATE is in another CPUID function on AMD than on Intel and udev doesn't see that bit to load acpi-cpufreq automatically. Before I go and install archlinux here, where can I get the udev sources which are in your archlinux installation to stare at them a little? :) Especially the cpu autoprobing part which supposedly uses the cpuid kernel driver. > I don't know if it matters, but I also have AMD microcode "0x10000c8", > albeit it didn't cause problems with 3.6.11... Nah, microcode doesn't have anything to do with it. Thanks. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --