Public bug reported:
Binary package hint: linux-source-2.6.22
(using gutsy, but I think it was the same in feisty)
using a "Genuine Intel(R) CPU T2400 @ 1.83GHz"
if the computer was unplugged at boot time
* both processors go to C3 when the laptop is unplugged. (1)
* CPU0 goes to C2, CPU1 to C3 when the laptop is plugged in. (2)
whereas, if the computer was plugged at boot time
* CPU0 goes to C3, CPU1 to C2 when the laptop is unplugged. (3)
* both processors go to C2 when the laptop is plugged in. (4)
=> So it looks like CPU1 available powerstate are defined at boot time
and never modified, whereas CPU0 changes when the laptop is plugged or
unplugged.
---------
(1)
cat /proc/acpi/processor/CPU*/power
active state: C3
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
C1: type[C1] promotion[C2] demotion[--] latency[001]
usage[00000010] duration[00000000000000000000]
C2: type[C2] promotion[C3] demotion[C1] latency[001]
usage[00024024] duration[00000000000114130312]
*C3: type[C3] promotion[--] demotion[C2] latency[057]
usage[00112408] duration[00000000000645676141]
active state: C3
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
C1: type[C1] promotion[C2] demotion[--] latency[001]
usage[00000010] duration[00000000000000000000]
C2: type[C2] promotion[C3] demotion[C1] latency[001]
usage[00551884] duration[00000000002261918965]
*C3: type[C3] promotion[--] demotion[C2] latency[057]
usage[04377438] duration[00000000031179229264]
---------
(2)
cat /proc/acpi/processor/CPU*/power
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[00000010] duration[00000000000000000000]
*C2: type[C2] promotion[--] demotion[C1] latency[001]
usage[00071033] duration[00000000000410369580]
active state: C3
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
C1: type[C1] promotion[C2] demotion[--] latency[001]
usage[00000010] duration[00000000000000000000]
C2: type[C2] promotion[C3] demotion[C1] latency[001]
usage[00565392] duration[00000000002326080358]
*C3: type[C3] promotion[--] demotion[C2] latency[057]
usage[04501678] duration[00000000031832189184]
---------
(3)
cat /proc/acpi/processor/CPU*/power
active state: C3
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
C1: type[C1] promotion[C2] demotion[--] latency[001]
usage[00000010] duration[00000000000000000000]
C2: type[C2] promotion[C3] demotion[C1] latency[001]
usage[00003896] duration[00000000000022791437]
*C3: type[C3] promotion[--] demotion[C2] latency[057]
usage[00024417] duration[00000000000235697781]
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[00000010] duration[00000000000000000000]
*C2: type[C2] promotion[--] demotion[C1] latency[001]
usage[00112419] duration[00000000001047405218]
---------
(4)
cat /proc/acpi/processor/CPU*/power
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[00000010] duration[00000000000000000000]
*C2: type[C2] promotion[--] demotion[C1] latency[001]
usage[00072639] duration[00000000000618470508]
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[00000010] duration[00000000000000000000]
*C2: type[C2] promotion[--] demotion[C1] latency[001]
usage[00070689] duration[00000000000656339622]
** Affects: linux-source-2.6.22 (Ubuntu)
Importance: Undecided
Status: New
--
second core CPU power state depends on battery state at boot time
https://bugs.launchpad.net/bugs/129812
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