http://bugzilla.kernel.org/show_bug.cgi?id=8950
Summary: Incorrect hardware limits reported by acpi-cpufreq on
Intel Q6600
Product: ACPI
Version: 2.5
KernelVersion: 2.6.23-rc3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Processor
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Most recent kernel where this bug did not occur: N/A (acpi-cpufreq would not
load on previous versions)
Distribution: Kubuntu 7.04 x86-64
Hardware Environment: Intel Core 2 Quad Q6600, XFX NForce 650i Ultra mainboard
(with latest BIOS)
Software Environment: Stock Kubuntu 7.04 with security updates
Problem Description: Cpufreq did not work at all on this setup on the Kubuntu
stock kernel (2.6.20), so I built 2.6.22-rc3, with Ubuntu config (updated with
make oldconfig). Now acpi-cpufreq loads, but cpufreq-info reports:
""""
available frequency steps: 44.61 GHz, 29.74 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 29.74 GHz and 29.74 GHz.
"""
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies lists:
"""
44613000 29742000
"""
Manually changing the governor to "userspace" and changing the frequency with
echo 44613000 > scaling_cur_freq
changes the reported current frequency, but has no effect on system performance
(verified with simple benchmarks).
Cpu frequency management is enabled in the BIOS. Scaling works fine on Windows
XP Pro.
Steps to reproduce:
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