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: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
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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