[Bugme-new] [Bug 10807] New: ACPI C-State missing since 2.6.19.3

Tue May 27 10:31:26 PDT 2008

http://bugzilla.kernel.org/show_bug.cgi?id=10807

           Summary: ACPI C-State missing since 2.6.19.3
           Product: ACPI
           Version: 2.5
     KernelVersion: >= 2.6.19.3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Processor
        AssignedTo: acpi_power-processor at kernel-bugs.osdl.org
        ReportedBy: matthias_dienstbier at yahoo.de

Latest working kernel version: 2.6.18.8
Kernel 2.6.19 to 2.6.19.2 won't compile, so not tested
Earliest failing kernel version: 2.6.19.3
Distribution: Arch Linux
Hardware Environment:
 * Intel Pentium Dual-Core / Core 2 Duo CPU
 * Intel GM965 / PM965 Chipset
Software Environment: Vanilla-kernel

Problem Description:
ACPI C3-State (Pentium) or C4-State (Core 2) isn't detected anymore and laptop
consumes more power. I've also tested some other Live-CDs: if kernel <=
2.6.18.8 C3 works, if kernel is newer C3 doesn't work. Problem still exists in
version 2.6.25.4.

Bootmessages kernel version 2.16.18.8:
Allocate Port Service[0000:00:1c.5:pcie02]
ACPI: AC Adapter [ACAD] (on-line)
ACPI: Battery Slot [BAT1] (battery absent)
ACPI: Power Button (FF) [PWRF]
ACPI: Lid Switch [LID0]
ACPI: Power Button (CM) [PWRB]
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu0Ist]
[20060707]
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu0Cst]
[20060707]
ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3])
ACPI: Processor [CPU0] (supports 8 throttling states)
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu1Ist]
[20060707]
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu1Cst]
[20060707]
ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])
ACPI: Processor [CPU1] (supports 8 throttling states)
Real Time Clock Driver v1.12ac

2.6.19.3:
Allocate Port Service[0000:00:1c.5:pcie02]
ACPI: AC Adapter [ACAD] (on-line)
ACPI: Battery Slot [BAT1] (battery absent)
ACPI: Power Button (FF) [PWRF]
ACPI: Lid Switch [LID0]
ACPI: Power Button (CM) [PWRB]
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu0Ist]
[20060707]
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu0Cst]
[20060707]
Monitor-Mwait will be used to enter C-1 state
Monitor-Mwait will be used to enter C-2 state
ACPI: CPU0 (power states: C1[C1] C2[C2])
ACPI: Processor [CPU0] (supports 8 throttling states)
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu1Ist]
[20060707]
ACPI (exconfig-0455): Dynamic SSDT Load - OemId [ PmRef] OemTableId [ Cpu1Cst]
[20060707]
ACPI: CPU1 (power states: C1[C1] C2[C2])
ACPI: Processor [CPU1] (supports 8 throttling states)
Real Time Clock Driver v1.12ac

/proc/acpi/processor/CPU0/power 2.6.18.8:
active state:            C3
max_cstate:              C8
bus master activity:     00000000
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[000]
usage[00000010] duration[00000000000000000000]
    C2:                  type[C2] promotion[C3] demotion[C1] latency[001]
usage[00000060] duration[00000000000000352022]
   *C3:                  type[C3] promotion[--] demotion[C2] latency[017]
usage[00034890] duration[00000000000477579415]

2.6.19.3:
active state:            C2
max_cstate:              C8
bus master activity:     00000000
maximum allowed latency: 8000 usec
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[001]
usage[00000370] duration[00000000000000000000]
   *C2:                  type[C2] promotion[--] demotion[C1] latency[017]
usage[00023870] duration[00000000000166137636]

"acpitool -c" 2.6.18.8:
  CPU type               : Intel(R) Pentium(R) Dual  CPU  T2330  @ 1.60GHz 
  CPU speed              : 1596.004 MHz 
  Cache size             : 1024 KB
  Bogomips               : 3196.88 
  Bogomips               : 3192.11 

  # of CPU's found       : 2

  Processor ID           : 0
  Bus mastering control  : yes
  Power management       : yes
  Throttling control     : yes
  Limit interface        : yes
  Active C-state         : C3
  C-states (incl. C0)    : 3
  Usage of state C1      : 60 (0.2 %)
  Usage of state C2      : 39778 (99.8 %)
  T-state count          : 8
  Active T-state         : T0

  Processor ID           : 1
  Bus mastering control  : yes
  Power management       : yes
  Throttling control     : yes
  Limit interface        : yes
  Active C-state         : C3
  C-states (incl. C0)    : 3
  Usage of state C1      : 128 (0.2 %)
  Usage of state C2      : 75167 (99.8 %)
  T-state count          : 8
  Active T-state         : T0

2.6.19.3:
  CPU type               : Intel(R) Pentium(R) Dual  CPU  T2330  @ 1.60GHz 
  CPU speed              : 1596.005 MHz 
  Cache size             : 1024 KB
  Bogomips               : 3196.92 
  Bogomips               : 3192.04 

  # of CPU's found       : 2

  Processor ID           : 0
  Bus mastering control  : yes
  Power management       : yes
  Throttling control     : yes
  Limit interface        : yes
  Active C-state         : C2
  C-states (incl. C0)    : 3
  Usage of state C1      : 440 (1.3 %)
  Usage of state C2      : 33768 (98.7 %)
  T-state count          : 8
  Active T-state         : T0

  Processor ID           : 1
  Bus mastering control  : yes
  Power management       : yes
  Throttling control     : yes
  Limit interface        : yes
  Active C-state         : C1
  C-states (incl. C0)    : 3
  Usage of state C1      : 273 (0.7 %)
  Usage of state C2      : 2642 (7.2 %)
  T-state count          : 8
  Active T-state         : T0

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