cpuspeed stuck in lowest speed after hibernate ?

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Hi,

I have just noticed that sometimes (not everytime...) after a hibernate/resume 
cycle, my machine seems to be stuck in its lowest cpu speed state. It has 
worked fine for quite some time  (although I have only had hibernate working 
since FC5).

Has anyone else seen anything like this ? I include below extracts 
from /proc/. I have searched around in the logs but not really found 
anything, but then I'm not sure what to look for or where.

I thought it might be a 2.6.17 kernel issue, since I recently updated to 
2.6.17-1.2145_FC5, but I see the same thing with 2.6.16-1.2133_FC5

cheers Chris

jonesc@localhost ~ > cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 9
model name      : Intel(R) Pentium(R) M processor 1500MHz
stepping        : 5
cpu MHz         : 600.000
cache size      : 1024 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr mce cx8 mtrr pge mca cmov pat clflush 
dts acpi mmx fxsr sse sse2 tm pbe est tm2
bogomips        : 1200.12

jonesc@localhost ~ > cat /proc/acpi/processor/CPU0/*
processor id:            0
acpi id:                 0
bus mastering control:   yes
power management:        yes
throttling control:      yes
limit interface:         yes
active limit:            P0:T0
user limit:              P0:T0
thermal limit:           P0:T0
active state:            C2
max_cstate:              C8
bus master activity:     12347887
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[000] 
usage[00000010]
   *C2:                  type[C2] promotion[C3] demotion[C1] latency[001] 
usage[00703531]
    C3:                  type[C3] promotion[C4] demotion[C2] latency[085] 
usage[00000039]
    C4:                  type[C3] promotion[--] demotion[C3] latency[185] 
usage[00000757]
state count:             8
active state:            T0
states:
   *T0:                  00%
    T1:                  12%
    T2:                  25%
    T3:                  37%
    T4:                  50%
    T5:                  62%
    T6:                  75%
    T7:                  87%


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