Re: SSDT on Sony VAIO
From: Jens Haug <hidden>
Date: 2003-01-17 07:37:53
On Fri, Jan 17, 2003 at 02:22:42AM +0900, Adachi, Kenichi wrote:quoted
Incidentally I didn't know the existence of CpuFreq project when I made the above statement. Dominik, if BIOS tells OS via ACPI _PCT to access FFH to initiate FID/VID change (in AMD PowerNow!), how current code coordinates it? I'm going to look into code soon, but I'd appreciate very much if you give me some insight in advance.Currently, it fails with this error message. If you add your patch, frequency transitions will still fail - the ACPI processor driver doesn't know anything about the PowerNow internals. So loading of teh ACPI cpufreq driver will be aborted at latest in acpi_cpufreq_init, if not earlier. So, actually I can't think of any way to use the ACPI processr driver for CPU frequency transitions in these cases - you need to use the "legacy" powernow-k7.c driver instead (which is currently developed by Dave Jones).
Did I understand this? I'm not sure. ACPI P-States use the cpufreq infrastructure (in 2.5.x). Cpufreq itself uses either the ACPI processor driver (for supported CPUs) or a special driver (like powernow-k7). So, in the future, ACPI P-States will use Cpufreq, Cpufreq will use powernow-k7, and everybody will be happy. Or can't we use P-States here at all, and everything will be done by Cpufreq like on a non-ACPI system? Jens -- Jens Haug IKFF Universität Stuttgart Tel. 0711/685-6422 Pfaffenwaldring 9 Fax 0711/685-6356 70550 Stuttgart haug-X6ztD3ggwzuBAmxm6OvjtTjhTm2NLCe8@public.gmane.org ------------------------------------------------------- This SF.NET email is sponsored by: Thawte.com Understand how to protect your customers personal information by implementing SSL on your Apache Web Server. Click here to get our FREE Thawte Apache Guide: http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0029en