cpufreq est and Enhanced Sleep (Cx) States for Intel Core and above

[Stephane E. Potvin]

Adam McDougall wrote:
> On Sat, Dec 09, 2006 at 07:29:23PM -0500, Adam McDougall wrote:
> 
>   src/sys/i386/cpufreq/est.c has many Pentium M cpus but nothing                                     
>   from the Intel Core and Core 2 families that I can see.  I tried
>   looking up the values myself, but could not find them in:
>   http://www.intel.com/design/mobile/datashts/314078.htm                                             
>                                                                                                      
>   It seems that even the latest version of the Linux kernel does not
>   list values for at least Yonah (Core 2).  Is it a big mystery, or is
>   this data actually available somewhere?  I have a Core 2 Duo 
>   T7600 in my laptop and est won't touch my cpu because it doesn't 
>   recognize it.  I did get it to use some other form of speed control
>   by putting hint.acpi_perf.0.disabled="1" in /boot/loader.conf according
>   to another post.
>   
>   Another thing I wish could work is the Enhanced cpu Sleep States;
>   this Dell Latitude D820 laptop only sees C1 although the document
>   above indicates it should probably support 4 unique states.  Is 
>   there a way I can debug and/or fix this?  I can post dumps of the
>   acpi stuff and/or verbose boot logs if it would be helpful.  
>   
>   Thanks
>   _______________________________________________
> 
> I am attaching my asl and dsdt acpi dumps incase someone knows for
> something to look for as for why it thinks I only have C1, unless 
> its related to the speed control problem above.  
> 
Hi Adam,

It's only finding the C1 state for various reasons that you'll find 
described in some details in the following email that I send to the acpi 
mailing list in June this year. The major reason being that the acpi cpu 
driver does not support well multiprocessor systems.

http://docs.freebsd.org/cgi/getmsg.cgi?fetch=116103+0+archive/2006/freebsd-acpi/20060611.freebsd-acpi

The email also included a patch to add support for multiprocessor 
systems to the acpi cpu driver. I've not updated the patch since then so 
it might or might not apply cleanly to a recent current.

Steph