Bug 160561

Summary: no C-states on atom D525
Product: Base System Reporter: Viktor Štujber <viktor.stujber+freebsd-bugs_v4CCPfay>
Component: amd64Assignee: freebsd-amd64 (Nobody) <amd64>
Status: Closed FIXED    
Severity: Affects Only Me    
Priority: Normal    
Version: 9.0-BETA1   
Hardware: Any   
OS: Any   

Description Viktor Štujber 2011-09-08 15:30:09 UTC 
Freebsd HEAD running on the intel atom board I have does not provide
C-state power management, all cores run at full power.  BIOS is updated
to latest version.

The motherboard is:
http://www.intel.com/cd/products/services/emea/eng/motherboards/desktop/D525MW/overview/453835.htm
Comment 1 Viktor Štujber 2012-01-08 11:05:42 UTC 
A freebsd user with an identical issue pointed me at
http://download.intel.com/embedded/processors/prodbrief/323288.pdf which
lists various atom processors and their "C-states supported". Turns out
D525 has no C-state power management, so what we encountered was not a
bug, but an intentional (but not advertised) hardware 'feature'.
Comment 2 Andriy Gapon freebsd_committer freebsd_triage 2012-01-08 12:16:43 UTC 
State Changed
From-To: open->closed

Per the submitter this is not a FreeBSD problem.