Bug 40442
| Summary: | cpuinfo_max_freq lost 500MHz | ||
|---|---|---|---|
| Product: | Power Management | Reporter: | Harald Dunkel (harri) |
| Component: | cpufreq | Assignee: | Len Brown (lenb) |
| Status: | CLOSED UNREPRODUCIBLE | ||
| Severity: | normal | CC: | acpi-bugzilla, florian, maciej.rutecki, rjw |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | Linux bugs.afaics.de 3.0.0 #2 SMP PREEMPT Tue Aug 2 22:11:04 CEST 2011 i686 GNU/Linux | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
| Bug Depends on: | |||
| Bug Blocks: | 36912 | ||
| Attachments: |
config file
output of dmesg |
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Created attachment 67372 [details]
output of dmesg
> powernow: This module only works with AMD K7 CPUs > p4-clockmod: Warning: EST-capable CPU detected. The acpi-cpufreq module > offers voltage scaling in addition to frequency scaling. You should use that > instead of p4-clockmod, if possible. ondemand governor failed, too long transition latency of HW, fallback to performance governor > p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available > cpufreq-nforce2: No nForce2 chipset. > ondemand governor failed, too long transition latency of HW, fallback to > performance governor # # x86 CPU frequency scaling drivers # # CONFIG_X86_PCC_CPUFREQ is not set CONFIG_X86_ACPI_CPUFREQ=m CONFIG_X86_POWERNOW_K6=m CONFIG_X86_POWERNOW_K7=m CONFIG_X86_POWERNOW_K7_ACPI=y CONFIG_X86_POWERNOW_K8=m CONFIG_X86_GX_SUSPMOD=m CONFIG_X86_SPEEDSTEP_CENTRINO=m CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE=y CONFIG_X86_SPEEDSTEP_ICH=m CONFIG_X86_SPEEDSTEP_SMI=m CONFIG_X86_P4_CLOCKMOD=m CONFIG_X86_CPUFREQ_NFORCE2=m CONFIG_X86_LONGRUN=m CONFIG_X86_LONGHAUL=m CONFIG_X86_E_POWERSAVER=m When you build these as modules, your kernel is at the mercy of the distro's user-space scripts to decide which order to load them. Do you see a difference with p4-clockmod excluded from your kernel? CONFIG_X86_P4_CLOCKMOD=n the output from grep . /sys/devices/system/cpu/cpu0/cpufreq/* for the success and failure case will help show what is happening. Sorry for the delay, but I cannot reproduce this problem anymore. I tried 3.0.0, 3.0.1 and 3.0.4. The config file hasn't changed, of course. Ok, shout if it pops up again. |
Created attachment 67362 [details] config file Running 3.0 my Pentium M lost 500MHz. "cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" shows: 1500000 If I move back to 2.6.39.3 then I get the expected 2000000.