[Bltk-discussion] How to Compute [watts] and what are the units of P/C states?

[Thitinan T. <thi...@ya...>]

Hello Everybody,=0A=0AMy CPU, AMD Athlon XP 1600+, from/proc/acpi/battery/B=
AT0/info it shows=0Adesign capacity: 4016 mAh=0Alast full capacity: 4011 mA=
h=0Adesign voltage: 9600 mV=0A=0AI used bltk to test 2 batteries one is 3mo=
nths age and another one 24months age. =0AWith the same profiles, of course=
 the battery lifetime from 2 batteries come out different. =0AIf I take thi=
s formula as following to calculate watts: =0A=0APower (watts) * t =3D V * =
(At)=0APower (watts) =3D V * (At) / t=0A=0AIn my case V=3D9600mVolts =3D 9.=
6Volts (from ACPI gives constant calue), (At)=3D4011mAh=3D4.011Ah=0AFor idl=
e profile:=0Athe old battery:  t(o)=3D49min=3D0.82h, Power (o) =3D 46.96Wat=
ts=0Athe new one: t(n)=3D207min=3D3.45h, Power(n) =3D 11.16Watts=0A=0AQuest=
ions:=0A1. Does it make sense that different batteries (on the same platfor=
m, same profile) give different power? =0AIf not, what parameters should be=
 the factor to compute watts, if voltage is constant? =0AWhich formula can =
we use to compute power? =0A=0A2. What are the units of C-state and P-state=
? Hz or sec?=0AIn my case (AMD Athlon XP 1600+) gives C1, C2 and P0, P1, P2=
, P3, P4 for C-State and P-State respectively. From one line of idle profil=
e shows C1=3D1890, C2=3D16361,,P0=3DP1=3DP2=3DP3=3D0, P4=3D5961, for the su=
mmation of P-state is approximately 6000.  =0A=0AThank you very much for yo=
ur help.=0ABest Regards,=0AThitinan=0A=0A__________________________________=
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