Thread: CPU Scaling stuck in "Performance" mode on Lucid Lynx 10.04 using P4 2.0GHz CPU

hello, all,

i've been doing lots of research on issue haven't come solution yet. i'm hoping reply familiar type of problem can offer in diagnosing and/or correcting problem.

installed fresh instance of lucid lynx 10.04 32-bit on sony vaio pcg-grz610 laptop. had cpu frequency scaling working on machine under hardy heron 8.04.

when first tried install gnome cpu scaling applet, not allow me to, saying frequency scaling unsupported. installed cpufreqd , cpufrequtils packages , added p4_clockmod module /etc/modules. on reboot, able install gnome applet without trouble.

however, i'm finding that, although applet active , shows current speed, not let me control cpu speed. can select wish drop-down menu, applet remains stuck on "performance" no matter do, result cpu runs fast can @ times (automatically slowing temporarily heat-related reasons).

i've tried directly change governor setting "ondemand" using command line, not respond either using cpufreq-set command or directly injecting 'ondemand' /sys/devices/system/cpu/cpu0/cpufreq/scaling-governor.

strangely, can minor improvement following steps:

1) comment out p4_clockmod in /etc/modules
2) reboot , login (cpu scaling applet reports scaling not supported)
3) use terminal load p4_clockmod ('sudo modprobe p4_clockmod')
4) logout , login (without rebooting)

@ point, scaling applet allows me manually set specific speed (e.g. 750 mhz), still reverts "performance" governor if choose governor setting.

if can offer insight issue, appreciated.

for additional information, output cpufreq-info , cpuid:

code:

cpufrequtils 006: cpufreq-info (c) dominik brodowski 2004-2009 report errors , bugs cpufreq@vger.kernel.org, please. analyzing cpu 0:   driver: p4-clockmod   cpus run @ same hardware frequency: 0   cpus need have frequency coordinated software: 0   maximum transition latency: 10.00 ms.   hardware limits: 250 mhz - 2.00 ghz   available frequency steps: 250 mhz, 500 mhz, 750 mhz, 1000 mhz, 1.25 ghz, 1.50 ghz, 1.75 ghz, 2.00 ghz   available cpufreq governors: conservative, ondemand, userspace, powersave, performance   current policy: frequency should within 250 mhz , 2.00 ghz.                   governor "performance" may decide speed use                   within range.   current cpu frequency 2.00 ghz.   cpufreq stats: 250 mhz:0.00%, 500 mhz:44.61%, 750 mhz:3.07%, 1000 mhz:0.64%, 1.25 ghz:0.19%, 1.50 ghz:0.96%, 1.75 ghz:0.00%, 2.00 ghz:50.53%  (13)

code:

 eax in    eax      ebx      ecx      edx 00000000 00000002 756e6547 6c65746e 49656e69 00000001 00000f27 00010809 00000400 bfebf9ff 00000002 665b5101 00000000 00000000 007b7040 80000000 80000004 00000000 00000000 00000000 80000001 00000000 00000000 00000000 00000000 80000002 20202020 20202020 20202020 6e492020 80000003 286c6574 50202952 69746e65 52286d75 80000004 20342029 20555043 30302e32 007a4847  vendor id: "genuineintel"; cpuid level 2  intel-specific functions: version 00000f27: type 0 - original oem family 15 - pentium 4 extended family 0 model 2 -  stepping 7 reserved 0  brand index: 9 [not in table] extended brand string: "              intel(r) pentium(r) 4 cpu 2.00ghz" clflush instruction cache line size: 8 hyper threading siblings: 1  feature flags bfebf9ff: fpu    floating point unit vme    virtual 8086 mode enhancements de     debugging extensions pse    page size extensions tsc    time stamp counter msr    model specific registers pae    physical address extension mce    machine check exception cx8    compxchg8b instruction sep    fast system call mtrr   memory type range registers pge    pte global flag mca    machine check architecture cmov   conditional move , compare instructions fgpat  page attribute table pse-36 36-bit page size extension clfsh  cflush instruction ds     debug store acpi   thermal monitor , clock ctrl mmx    mmx instruction set fxsr   fast fp/mmx streaming simd extensions save/restore sse    streaming simd extensions instruction set sse2   sse2 extensions ss     self snoop ht     hyper threading tm     thermal monitor 31     reserved  tlb , cache info: 51: instruction tlb: 4kb , 2mb or 4mb pages, 128 entries 5b: data tlb: 4kb , 4mb pages, 64 entries 66: 1st-level data cache: 8kb, 4-way set assoc, 64 byte line size 40: no 2nd-level cache, or if 2nd-level cache exists, no 3rd-level cache 70: trace cache: 12k-micro-op, 4-way set assoc 7b: 2nd-level cache: 512kb, 8-way set assoc, sectored, 64 byte line size

note output within session in manually loaded p4_clockmod module; "current policy" line in cpufreq-info output shows range 2.0ghz 2.0ghz.

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