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[Bug 741884] New: no /proc/acpi/processor/
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Tue, 17 Jan 2012 14:01:21 +0000
  • Message-id: <>

Summary: no /proc/acpi/processor/
Classification: openSUSE
Product: openSUSE 12.1
Version: Final
Platform: x86-64
OS/Version: SuSE Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Kernel
AssignedTo: kernel-maintainers@xxxxxxxxxxxxxxxxxxxxxx
ReportedBy: giecrilj@xxxxxxxxxxxx
QAContact: qa@xxxxxxx
Found By: ---
Blocker: ---

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101
Firefox/9.0.1 Putting the Processor to Sleep (C-states)¶

Modern processors have several power saving modes called C-states. They reflect
the capability of an idle processor to turn off unused components in order to
save power. The operating system puts the processor to sleep whenever there is
no activity. In this case, the operating system sends the CPU a halt command.
There are three idle states: C1, C2, and C3. In the most economic state, C3,
even the synchronization of the processor cache with the main memory is halted.
Therefore, this state can only be applied if no other device modifies the
contents of the main memory via bus master activity. Some drivers prevent the
use of C3. The current state is displayed in /proc/acpi/processor/*/power.

Or isn‘t it?

Reproducible: Always

Steps to Reproduce:
1. { ls /proc/acpi/processor/; }

Actual Results:
1. ls: cannot access /proc/acpi/processor/: No such file or directory

Expected Results:
1. Something.

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