2009.03
Šarūnas Burdulis
Department of Mathematics
Dartmouth College
Intel Core Duo low voltage processor L2300 (1.50GHz, 2MB L2, 667MHz
FSB)
1GB RAM (2 NonParity DDR2 SDRAM SoDIMM PC2-5300)
Intel Graphics Media Accelerator 950
12.1 inch XGA (1024x768) (Lenovo LTN121XJ-L07)
40GB 5400rpm Serial ATA (Toshiba MK4032GSX)
USB 2.0 CD-RW/DVD-ROM Combo Drive
Intel PRO/1000 Gigabit Ethernet
Intel PRO/Wireless 3945ABG
Firewire
SD Card Reader
56K V.92 Modem
$ lspci 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02) 00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 02) 00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02) 00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA AHCI Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02) 02:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Controller 03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02) 15:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b4) 15:00.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C552 IEEE 1394 Controller (rev 09) 15:00.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 18)
Debian installer detected Intel PRO/Wireless
and offered to install required packages from non-free,
but apparently it failed to install all that is needed.
To enable wireless, add non-free to /etc/apt/sources.list:
deb http://ftp.us.debian.org/debian/ lenny main
non-free
Then install binary firmware:
# apt-get update
# apt-get install firmware-iwlwifi
PowerTOP output with fully charged battery and wireless on. All other settings are at install defaults. The battery is quite old and is reported to last 2:07 hours under similar conditions in other OS.
# powertop -d PowerTOP 1.10 (C) 2007, 2008 Intel Corporation Collecting data for 15 seconds Cn Avg residency C0 (cpu running) ( 1.0%) C0 0.0ms ( 0.0%) C1 halt 0.0ms ( 0.0%) C2 0.0ms ( 0.0%) C3 11.2ms (99.0%) P-states (frequencies) 1500 Mhz 0.0% 1000 Mhz 100.0% Wakeups-from-idle per second : 88.7 interval: 15.0s Power usage (ACPI estimate): 14.8W (2.0 hours) Top causes for wakeups: 50.1% ( 32.7) interrupt : iwl3945 9.0% ( 5.9) avahi-daemon : schedule_timeout (process_timeout) 8.0% ( 5.2) kernel IPI : Rescheduling interrupts 6.1% ( 4.0) kernel module : usb_hcd_poll_rh_status (rh_timer_func) 3.3% ( 2.1) kernel module : neigh_table_init_no_netlink (neigh_periodic_timer) 3.1% ( 2.0) kernel core : clocksource_register (clocksource_watchdog) ... ... ...
Following PowerTOP suggestions, i.e. adding
kernel option
# echo 1500 > /proc/sys/vm/dirty_writeback_centisecs # echo min_power > /sys/class/scsi_host/host0/link_power_management_policy # echo 5 > /sys/bus/pci/drivers/iwl3945/0000:03:00.0/power_level # echo 5 > /proc/sys/vm/laptop_mode
results in slightly better efficiency:
Wakeups-from-idle per second : 68.7 interval: 15.0s Power usage (ACPI estimate): 12.8W (2.3 hours)
$ uname -a Linux gimli 2.6.26-1-686 #1 SMP Sat Jan 10 18:29:31 UTC 2009 i686 GNU/Linux
Kernel modules as loaded after the default install:
$ lsmod Module Size Used by i915 25280 2 drm 65256 3 i915 rfcomm 28272 0 l2cap 17248 5 rfcomm bluetooth 44900 4 rfcomm,l2cap ppdev 6468 0 parport_pc 22500 0 lp 8164 0 parport 30988 3 ppdev,parport_pc,lp ipv6 235300 16 acpi_cpufreq 6796 0 cpufreq_stats 3776 0 cpufreq_userspace 3172 0 cpufreq_conservative 5960 0 cpufreq_ondemand 6476 2 freq_table 4224 3 acpi_cpufreq,cpufreq_stats,cpufreq_ondemand cpufreq_powersave 1856 0 sbp2 18572 0 loop 12748 0 irtty_sir 4480 0 arc4 1824 2 sir_dev 10724 1 irtty_sir ecb 2624 2 crypto_blkcipher 15236 1 ecb pcmcia 29548 0 iwl3945 78772 0 serio_raw 4740 0 irda 95480 1 sir_dev firmware_class 6816 2 pcmcia,iwl3945 crc_ccitt 2080 1 irda yenta_socket 20620 1 rsrc_nonstatic 9504 1 yenta_socket pcmcia_core 31892 3 pcmcia,yenta_socket,rsrc_nonstatic mac80211 139680 1 iwl3945 iTCO_wdt 9508 0 psmouse 32336 0 i2c_i801 7920 0 bay 4160 0 pcspkr 2432 0 rng_core 3940 0 i2c_core 19828 1 i2c_i801 cfg80211 21576 2 iwl3945,mac80211 video 16432 0 output 2912 1 video battery 10180 0 ac 4196 0 snd_hda_intel 324248 1 snd_pcm 62596 1 snd_hda_intel snd_seq 41456 0 snd_timer 17800 2 snd_pcm,snd_seq snd_seq_device 6380 1 snd_seq snd 45604 7 snd_hda_intel,snd_pcm,snd_seq,snd_timer,snd_seq_device thinkpad_acpi 49632 0 soundcore 6368 1 snd intel_agp 22332 1 led_class 3908 2 iwl3945,thinkpad_acpi button 6096 0 agpgart 28776 3 drm,intel_agp snd_page_alloc 7816 2 snd_hda_intel,snd_pcm nvram 7116 1 thinkpad_acpi evdev 8000 7 ext3 105512 1 jbd 39444 1 ext3 mbcache 7108 1 ext3 ide_pci_generic 3908 0 [permanent] sd_mod 22200 2 piix 6568 0 [permanent] ide_core 96168 2 ide_pci_generic,piix usbhid 35904 0 hid 33184 1 usbhid ff_memless 4392 1 usbhid ata_generic 4676 0 ohci1394 24944 0 sdhci 13060 0 ahci 23596 1 ieee1394 75800 2 sbp2,ohci1394 mmc_core 39932 1 sdhci libata 140384 2 ata_generic,ahci scsi_mod 129356 3 sbp2,sd_mod,libata ehci_hcd 28428 0 uhci_hcd 18672 0 usbcore 118160 4 usbhid,ehci_hcd,uhci_hcd e1000e 84612 0 dock 8304 2 bay,libata thermal 15228 0 processor 32576 4 acpi_cpufreq,thermal fan 4164 0 thermal_sys 10856 4 video,thermal,processor,fan