[ltp] When/where/what for low power consumption?

[Gilson Laurent]

Hello

>    What commands do you use to put your system into low power consumption
>    mode, and when/where do you issue these commands (on system startup,
>    on ACPI events, etc.)?

Oh... there are quite a lot (R51, radeon 7500). The classics first:

- turn down the display-brightness.

- cpufreqd

- "iwconfig eth1 power period 1000" for the ipw2200

- "rovclock -c 80 -m 110" and "radeontool dac off" for the radeon (the new
ati-driver don't work with 7500, so i can't use powerplay)

- undervolting the CPU using this:
http://gentoo-wiki.com/HOWTO_Undervolt_a_Pentium_M_CPU (echo
"1100,988,892,828,748,700" >
/sys/devices/system/cpu/cpu0/cpufreq/voltage_table)

- Turn off the HD after startup, the system runs of a ramdisc created in the
initrd. For a normal workstation you need about 400-450 MB RAM for HD-images
(use squashfs, it helps). Changes are saved at shutdown.


The offical runtime for my laptop is 3:30-4:00. I get about 4:30 using
openoffice and surfing (3:30 under windows). The fan does not run at all.
Temperatures form ibm-acpi after 40 min:  33(CPU) 37(WLAN) 27(battery)
37(gfx) 25(CD-ROM)

cu

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