http://bugzilla.kernel.org/show_bug.cgi?id=10952
Summary: "scaling_max_freq" constantly shifting between minimum
and maximum frequency
Product: ACPI
Version: 2.5
KernelVersion: 2.6.25.7
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: None found
Earliest failing kernel version: 2.6.22 perhaps (Ubuntu gutsy did not exhibit
this problem)
Distribution: Ubuntu Hardy
Hardware Environment: Intel Core 2 Duo T7500
Software Environment: ubuntu kernel 2.6.24-19 and vanilla 2.6.25.7
Problem Description:
Regardless of the system load, the "scaling_max_freq" value will suddently, but
quickly, decrease (pass through all available middle frequencies) until it
reaches the lowest available frequency. Then, it will stay there for a duration
of time (more than 10 minutes), regardless of the system load. During this
time, it is not possible to raise the cpu frequency in any way. switching the
governor from "ondemand" to "performance" has no effect (probably because of
the limiting factor of "scaling_max_freq"). After this undefined period of time
is over, the value of the "scaling_max_freq" will quickly rise to its maximum
value, passing through each available frequency in between.
This cycle of maximum frequency change repeats indefinitely, at seemingly
random intervals. Furthermore, it is not possible to change the
"scaling_max_freq" value. Although echoing a new valid value with not produce
any errors, a 'cat' immediately after the echo will show the old value.
Steps to reproduce:
Just wait. Also seems to occur when the system is under load (ironically).
I've also posted a launchpad bug here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/242006
This bug is probably related, but is not a duplicate of these bugs:
http://bugzilla.kernel.org/show_bug.cgi?id=10383
http://bugzilla.kernel.org/show_bug.cgi?id=9919
Addng acpi_oci="!Windows 2006" does not remove the problem.
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