http://bugzilla.kernel.org/show_bug.cgi?id=9807
Summary: ACPI processor idle driver creates
/proc/acpi/processor/*/power although C2 or C3 isn't
supported
Product: ACPI
Version: 2.5
KernelVersion: 2.6.24-rc8
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Processor
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected], [EMAIL PROTECTED]
Latest working kernel version: None
Earliest failing kernel version: All
Distribution: FC8
Hardware Environment: All
Software Environment: All
Problem Description: ACPI processor idle driver makes sense only if the
processor supports
C2 or C3. For legacy C0 and C1, just the original pm_idle is working
, statistics info about promotion, demotion, latency, usage and
duration are empty or 0, so these are misleading, users'll think their
CPUs support C states (C2 or C3), /proc/acpi/processor/CPU*/power
shouldn't exist for this case at all.
Steps to reproduce:
[EMAIL PROTECTED] ~]# dmesg | grep power
[EMAIL PROTECTED] ~]# cat /proc/acpi/processor/CPU0/info
processor id: 0
acpi id: 1
bus mastering control: yes
power management: no
throttling control: yes
limit interface: yes
[EMAIL PROTECTED] ~]# cat /proc/acpi/processor/CPU0/power
active state: C0
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 2000 usec
states:
C1: type[C1] promotion[--] demotion[--] latency[000]
usage[00000000] duration[00000000000000000000]
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