Regeneration

I'm using Ubuntu 8.10 on Lenovo 3000 C100 and the battery life time is really poor (2 hours). I removed all the eye candy features and its still poor. Any ideas how to sort it out?

xiaomhome

What powersaving features are you using??? (I dont use ubuntu anymore, it just got too bloated)

Some tools
laptop-mode (screen, hd, p4 throlling and other powersaving stuff)
http://samwel.tk/laptop_mode/

cpufreqd (control cpu frequency with simple rules - temperature, ac status etc..)
http://cpufreqd.sourceforge.net/

Recompile a kernel with timer frequency low (100MHz) and Tickless System, you can find this at
Processor type and features -> Timer Frequency, Tickless System
(Enable audio powersaving at Devices --> Sound card support --> alsa (advanced linux sound architecture) (or build the driver outside the kernel - see alsa official site) --> your codec --> powersaving)

Note: If you do consider compilling a kernel, build a kernel from scratch: (Highly recommended)
$ cd /patch/to/kernel/source
$ make allnoconfig
$ make menuconfig or make xconfig
$ make install && make modules_install && make install
-- Fix grub or lilo

Disable your internet interfaces (wifi, ethernet) (there are also modified wireless drivers that reduce the wifi antena power consumption but thats too risky)
# ifconfig <interface> down
or
# rmmod <interface module>

rmmod other modules you dont use. If your notebook has a nvidia graphic card and you dont use eye candy (e.g. compiz) force low performance always. (Sorry dont remember any article that explains that but a little googling around you should be able to find it)

Enable your sound card powersaving features (at kernel and a configuration file located here: /etc/conf.d/alsa - I dont know where ubuntu devs left that file)

Regeneration

Thanks for the help, but the battery lifetime is still poor (2h). I was forced to install Windows XP where it seems a lot better (4h). I think this laptop uses some kind of unique PM driver to control its PM features.

xiaomhome

Look at this:
http://www.lesswatts.org/

Regeneration

* Enable the power aware SMP scheduler
- Only one core on the laptop.
* Use SATA link power management
- No SATA ports here.
* Enable WiFi power management
- Already enabled.
* Check for unused Bluetooth
- Already disabled.
* Use gigabit ethernet speeds only when needed
- Ethernet don't support gigabit and already disabled anyway.

Unixlord

Try running Intel PowerTOP and see what's leeching all that battery life. Is your CPU successfully throttling clock speed and voltages at idle?

__________________
IQ, when aggregated, follows Ohm's law.

Regeneration

Its a sucky Celeron, no clock throttling.

Regeneration

I solved the issue by using p4_clockmod and powernowd modules.

1. sudo apt-get remove powernowd
2. sudo modprobe p4_clockmod
3. sudo nano /etc/modules and adding p4_clockmod
4. sudo apt-get install powernowd
5. verify with cat /proc/cpuinfo