View Full Version : [xubuntu] Reducing power consumption - Macbook Air 2010

December 4th, 2012, 01:54 PM
I have Xubuntu installed on a late 2010 Macbook Air (Core 2 Duo + Nvidia 320m GPU). I'm trying to find ways to reduce power consumption, aiming for under 10w when idling.

So far, I've:

- Installed laptop-mode-tools
- Turned off bluetooth
- Reduced the minimum brightness level on the display

However, even after this battery life is quite poor. The output from powertop shows:

The battery reports a discharge rate of 11.5 W
The estimated remaining time is 3 hours, 25 minutes

Summary: 213.9 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and 5.2% CPU

Usage Events/s Category Description
100.0% Device Audio codec hwC0D4: Nvidia
100.0% Device Audio codec hwC0D0: Cirrus
100.0% Device Audio codec hwC0D3: Nvidia
100.0% Device Audio codec hwC0D5: Nvidia
3.0% Device Display backlight
20.2 ms/s 145.5 Process /usr/lib/firefox/firefox
14.0 ms/s 10.3 Process /usr/bin/X :0 -core -auth
3.5 ms/s 20.9 Timer hrtimer_wakeup
2.7 ms/s 0.00 Interrupt [0] timer/0
1.8 ms/s 4.4 Interrupt [17] ohci_hcd:usb3
1.6 ms/s 3.2 Timer tick_sched_timer
1.4 ms/s 24.8 Process powertop
1.0 ms/s 0.00 Interrupt [1] timer(softirq)
1.0 ms/s 0.00 kWork do_dbs_timerI would appreciate any help in identifying things I can get rid of to improve my battery life...

December 4th, 2012, 04:51 PM
You may also look into CPU throttling. Heres a link with lots more that maybe helpful.


December 4th, 2012, 05:10 PM
Thread moved to the "Apple Users" forum.

December 4th, 2012, 05:17 PM
Since you are already using powertop, are there any suggestions from this tool? If yes, it may be worth posting them.