battery life on presario 720

[Rudolph Pereira]

Hello,
I have a presario 720au laptop (only has acpi support), 
and I am trying to work out why it's
running time on battery is so low under freebsd.
Under linux and windows xp, I can get up to about 4 hours of battery
life, while on freebsd (-current, compiled jul 9), it's less than two
hours (closer to 1:45).

Is there something fundamental I'm missing? Both windows xp and linux
seem to run quieter/cooler (I assume they are turning off fans, idling
the cpu, etc), but I cannot achieve the same effect with freebsd.

I've attached a dmesg, if that's of any help. All the OSs are pretty
much stock standard installs with no tweaking. Linux is 2.4.21 +acpi
patches, and freebsd only has nate's EC patch (which has since been
committed, iirc). I've tried using my own compiled dsdt/aml table but
that doesn't seem to change anything.

If anyone can point me in the right direction, or give any other
information, it would be appreciated.

thanks

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Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
	The Regents of the University of California. All rights reserved.
FreeBSD 5.1-CURRENT #2: Wed Jul  9 17:23:59 EST 2003
    rudolph at psi:/var/tmp/obj/var/tmp/src/sys/C720AU-current
Preloaded elf kernel "/boot/kernel/kernel" at 0xc045a000.
Preloaded acpi_dsdt "/boot/acpi_dsdt.aml" at 0xc045a244.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc045a28c.
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 1096206103 Hz
CPU: mobile AMD Duron(tm) Processor (1096.21-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x671  Stepping = 1
  Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
  AMD Features=0xc0480000<MP,AMIE,DSP,3DNow!>
real memory  = 251658240 (240 MB)
avail memory = 239599616 (228 MB)
Pentium Pro MTRR support enabled
VESA: v2.0, 15296k memory, flags:0x1, mode table:0xc039b242 (1000022)
VESA: S3 Incorporated. Twister BIOS
ACPI: DSDT was overridden.
    ACPI-0375: *** Info: Table [DSDT] replaced by host OS
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <PTLTD    RSDT  > on motherboard
pcibios: BIOS version 2.10
Using $PIR table, 7 entries at 0xc00fdf50
acpi0: power button is handled as a fixed feature programming model.
Timecounter "ACPI-safe"  frequency 3579545 Hz
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x8008-0x800b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_button0: <Sleep Button> on acpi0
acpi_button1: <Power Button> on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
acpi_acad0: <AC adapter> on acpi0
acpi_cmbat0: <Control method Battery> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib0: slot 7 INTD is routed to irq 9
pcib0: slot 7 INTC is routed to irq 5
pcib0: slot 9 INTA is routed to irq 4
pcib0: slot 11 INTA is routed to irq 11
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pcib1: could not get PCI interrupt routing table for \\_SB_.PCI0.AGP_ - AE_NOT_FOUND
pci1: <ACPI PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 82C686B UDMA100 controller> port 0x1840-0x184f at device 7.1 on pci0
atapci0: Correcting VIA config for southbridge data corruption bug
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <serial bus, USB> at device 7.2 (no driver attached)
pci0: <bridge, PCI-unknown> at device 7.4 (no driver attached)
pci0: <multimedia, audio> at device 7.5 (no driver attached)
pci0: <simple comms> at device 9.0 (no driver attached)
cbb0: <TI1410 PCI-CardBus Bridge> mem 0xffbfe000-0xffbfefff at device 10.0 on pci0
cardbus0: <CardBus bus> on cbb0
pccard0: <16-bit PCCard bus> on cbb0
pcib0: slot 10 INTA is routed to irq 11
rl0: <RealTek 8139 10/100BaseTX> port 0x1400-0x14ff mem 0xe8010000-0xe80100ff irq 11 at device 11.0 on pci0
rl0: Realtek 8139B detected. Warning, this may be unstable in autoselect mode
rl0: Ethernet address: 00:08:02:2e:ca:e1
miibus0: <MII bus> on rl0
rlphy0: <RealTek internal media interface> on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> port 0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
ppc0 port 0x778-0x77b,0x378-0x37f irq 7 drq 3 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse, device ID 3
acpi_ec0: <embedded controller> port 0x66,0x62 on acpi0
orm0: <Option ROMs> at iomem 0xe0000-0xe3fff,0xdc000-0xdffff,0xc0000-0xcbfff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 8250 or not responding
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 10.000 msec
IPsec: Initialized Security Association Processing.
acpi_cpu: throttling enabled, 16 steps (100% to 6.2%), currently 100.0%
pccard0: <unknown card> (manufacturer=0x0156, product=0x0002) at function 0
pccard0:    CIS info: Avaya Communication, Avaya Wireless PC Card, Version 01.01
ata1-slave: timeout waiting for interrupt
ata1-slave: ATAPI identify failed
ad0: 19077MB <FUJITSU MHR2020AT> [38760/16/63] at ata0-master UDMA100
acd0: CDROM <SR243T> at ata1-master PIO4
Mounting root from ufs:/dev/ad0s2a
uhci0: <VIA 83C572 USB controller> port 0x1800-0x181f irq 9 at device 7.2 on pci0
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered