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, > JMM > 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: http://bugzilla.kernel.org/show_bug.cgi?id=9014 > 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 -- Ritesh Raj Sarraf RESEARCHUT - http://www.researchut.com "Necessity is the mother of invention."
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