From: bugme-daemon@bugzilla.kernel.org
To: cpufreq@www.linux.org.uk
Subject: [Bug 9636] New: cpufreq reports too low max freq on Intel P4
Date: Wed, 26 Dec 2007 04:34:41 -0800 (PST) [thread overview]
Message-ID: <bug-9636-3570@http.bugzilla.kernel.org/> (raw)
http://bugzilla.kernel.org/show_bug.cgi?id=9636
Summary: cpufreq reports too low max freq on Intel P4
Product: Power Management
Version: 2.5
KernelVersion: 2.6.23
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: cpufreq
AssignedTo: cpufreq@www.linux.org.uk
ReportedBy: peter.ganzhorn@googlemail.com
Most recent kernel where this bug did not occur: -
Distribution: Debian testing
Hardware Environment: Intel P4 3.0GHz HT, Intel 945 chipset
Software Environment: Debian testing
Problem Description:
Using the acpi-cpufreq driver the CPU will not switch to a frequency higher
than 1.5 GHz; the sysfs cpufreq interface (cpuinfo_max_freq) reports 1.5 GHz to
be the maximum frequency available as well.
The same kernel without cpufreq support enabled does not show those problems,
the CPU will run at 3 GHz without cpufreq.
Kernel 2.6.23 and 2.6.24-rc* both show the problem.
Here some output with cpufreq enabled:
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
1500000
# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
1500000
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1500000 1400000
Actually it *should* report frequencies up to 3 GHz, but only does report up to
1.5 GHz.
I'm gonna attach the /proc/cpuinfo data to this bug report, let me know if you
need any other information.
This is a really, really nasty bug.
Steps to reproduce: Depends on my hardware I guess.
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next reply other threads:[~2007-12-26 12:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-26 12:34 bugme-daemon [this message]
2007-12-26 12:35 ` [Bug 9636] cpufreq reports too low max freq on Intel P4 bugme-daemon
2007-12-26 12:39 ` bugme-daemon
2008-01-01 18:15 ` bugme-daemon
2008-01-27 11:20 ` bugme-daemon
2008-01-27 11:21 ` bugme-daemon
2008-03-02 19:44 ` bugme-daemon
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