i386/133388: est causes wrong dev.cpu.0.freq_levels values

[Pierre-Luc Drouin]

>Number:         133388
>Category:       i386
>Synopsis:       est causes wrong dev.cpu.0.freq_levels values
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Apr 05 00:00:09 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Pierre-Luc Drouin
>Release:        Problem since 7.1-release has been installed
>Organization:
>Environment:
>Description:
FreeBSD stable >=7.1 gets the wrong CPU levels for my Pentium M 2.0 GHz when est is enabled. The maximum level is 1500 instead of 2000. Output from sysctl:

dev.cpu.0.freq: 1500
dev.cpu.0.freq_levels: 1500/-1 1312/-1 1200/-1 1050/-1 1000/-1 875/-1
800/-1 700/-1 600/-1 525/-1 450/-1 375/-1 300/-1 225/-1 150/-1 75/-1
dev.est.0.%desc: Enhanced SpeedStep Frequency Control
dev.est.0.freq_settings: 1500/-1 1200/-1 1000/-1 800/-1 600/-1 

Output when est is disabled via hint.est.0.disabled="1" in device.hints:

dev.cpu.0.freq: 1745
dev.cpu.0.freq_levels: 1995/-1 1745/-1 1496/-1 1246/-1 997/-1 748/-1 498/-1 249/-1
dev.p4tcc.0.%desc: CPU Frequency Thermal Control
dev.p4tcc.0.freq_settings: 10000/-1 8750/-1 7500/-1 6250/-1 5000/-1 3750/-1 2500/-1 1250/-1

Output from dmesg:
Mar 30 15:08:03 mdaemon kernel: CPU: Intel(R) Pentium(R) M processor 2.00GHz (1995.14-MHz 686-class CPU)
Mar 30 15:08:03 mdaemon kernel: Origin = "GenuineIntel"  Id = 0x6d8  Stepping = 8
Mar 30 15:08:03 mdaemon kernel: Features=0xafe9fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,TM,PBE>
Mar 30 15:08:03 mdaemon kernel: Features2=0x180<EST,TM2>
Mar 30 15:08:03 mdaemon kernel: AMD Features=0x100000<NX>
Mar 30 15:08:03 mdaemon kernel: real memory  = 1073577984 (1023 MB)
Mar 30 15:08:03 mdaemon kernel: avail memory = 1032699904 (984 MB)
Mar 30 15:08:03 mdaemon kernel: ACPI APIC Table: <DELL   D05    > 

Output from devinfo:
cpu0 pnpinfo _HID=none _UID=0 at handle=\_PR_.CPU0
       ACPI I/O ports:
           0x1014
           0x1015
           0x1016
     est0
     p4tcc0
     acpi_perf0
     acpi_throttle0
     cpufreq0 
>How-To-Repeat:
It has been reported on the acpi mailing list that this problem was also affecting Dual-Core Pentium 1.8GHz processors
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: