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Subjecttime goes backwards periodically on laptop if booted in low-power mode
My Toshiba laptop (running stock Red Hat 7.2, kernel 2.4.7-10) 
appears to suffer from a power management-related time hiccup: when
I boot in low-power mode, then switch to high-power mode,
time goes backwards by 10ms several times a second.
According to the thread
Subject: [PATCH]: allow notsc option for buggy cpus
From: Anton Blanchard <>
Date: 2001-03-10 0:58:29
this can be fixed by disabling the TSC option, but there
ought to be a runtime fix. Was a runtime fix ever put
together for this situation?

FWIW, the system is a Toshiba Satellite 2805, and /proc/cpuinfo reports

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 746.342
cache size : 256 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 pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 1490.94

when booted in high power mode; when booted in low power mode,
/proc/cpuinfo changes as follows:

< cpu MHz : 746.342
> cpu MHz : 383.295
< bogomips : 1490.94
> bogomips : 750.38

- Dan

p.s. there were three other (unresolved?) threads about similar
time problems, but I don't think I'm suffering from these.

Subject: gettimeofday question
From: Russell King <>
Date: 2001-03-03 12:49:04

Subject: 40ms/10ms error in do_gettimeofday()
From: Bernard Imbert <>
Date: 2000-04-04 10:15:57

Subject: problems with do_slow_gettimeoffset()
From: Jason Sodergren <>
Date: 2000-03-30 22:35:36
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