From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeroen Van der Vegt Subject: Userspace: available processorspeeds Date: Mon, 06 Oct 2003 11:19:25 +0200 Sender: cpufreq-bounces@www.linux.org.uk Message-ID: <3F81339D.6010305@ITS.TUDelft.nl> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: cpufreq-bounces@www.linux.org.uk Content-Type: text/plain; charset="us-ascii"; format="flowed" To: cpufreq@www.linux.org.uk Hello, I'm trying to write a userspace processor-speed governor for my laptop, an Asus L3000D. It has an AMD Athlon Mobile processor and runs on Linux 2.6.0-test5 (and Debian unstable). For some reason, my laptop crashes when the speed changes from maximum to minimum at once. So my program is to step the speed only to the next level available. This is repeated every 5 seconds, so both the maximum and minimum speed are reachable. The available speeds are printed when the module PowerNow is loaded, but isn't there a 'better' way to retrieve this information? There doesn't seem to be a file listing all possible speeds in either /proc nor /sys. Have I overlooked a file perhaps, or is there some function call I can use? Besides this, I have experienced the following weirdness: according to /sys/.../scaling_min_freq, my processor's minimum speed is 532 Mhz. I have, however, had it running at 292Mhz (as reported by /proc/cpuinfo). It's not really reproducible unfortunately, and I only noticed it once or twice.The laptops keeps working fine though, so it's not much of a problem to that respect. Any actions I should take the next time I see it? Regards, Jeroen van der Vegt.