svn commit: r219046 - head/sys/x86/cpufreq

Jung-uk Kim jkim at
Fri Feb 25 23:32:06 UTC 2011

On Friday 25 February 2011 06:14 pm, Jung-uk Kim wrote:
> Author: jkim
> Date: Fri Feb 25 23:14:24 2011
> New Revision: 219046
> URL:
> Log:
>   Set C1 "I/O then Halt" capability bit for Intel EIST.  Some
> broken BIOSes refuse to load external SSDTs if this bit is unset
> for _PDC.  It seems Linux and OpenSolaris did the same long ago.
>   MFC after:	1 week

Please note, however, it only works when cpufreq(4) is loaded with 
acpi(4) because acpi_cpu evaluates _PDC (or _OSC) only once.

FYI, this is an OpenSolaris PR I found:

Jung-uk Kim

More information about the svn-src-all mailing list