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Re: power management problems

On Thursday 13 September 2007, Jean-Marie Mouchel wrote:
> Hi,
> I am running 2.6.18 kernel (etch) on a DELL D610 laptop.
> I had many problems with the acpi-cpufreq module which dit not load
> properly, no easy control on frequency etc... (and much less than one
> hour working time, plus laptop getting hot - I guess hardware does not
> like that ! -).
> I changed to the speedstep-centrino module which works perfectly
> (p4-clockmod also worked well,  but less flexible).
> I have now more that 2 hours working time on battery, about the same
> under Windows XP.
> Regards,

Hi Jean,

Thanks a lot for hinting this.
I used to use speedstep-centrino until one ugly day when I saw this message in 
my syslog:

Sep 13 15:07:11 learner kernel: speedstep-centrino with 
X86_SPEEDSTEP_CENTRINO_ACPI config is deprecated.
Sep 13 15:07:11 learner kernel:  Use X86_ACPI_CPUFREQ (acpi-cpufreq) instead.
Sep 13 15:07:11 learner powersaved: Starting powersaved with ACPI support

This is when I moved to acpi-cpufreq. I think that would have been the time 
when I started seeing such low battery backups.
I'm back to speedstep-centrino and see good results. More investigation going 
on. Thanks again.

I've filed a bug report at:

> PS : Do you have an additional battery on the XPS ? Can you see it
> (/proc/acpi/battery/BAT0/info or BAT1)?

I don't have an additional battery. My battery is 6 Cell.

rrs@learner:~$ cat /proc/acpi/battery/BAT0/info
present:                 yes
design capacity:         4800 mAh
last full capacity:      1259 mAh
battery technology:      rechargeable
design voltage:          11100 mV
design capacity warning: 480 mAh
design capacity low:     145 mAh
capacity granularity 1:  48 mAh
capacity granularity 2:  48 mAh
model number:            DELL YF0806
serial number:           2004
battery type:            LION
OEM info:                SMP

Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."

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