In a previous post I was asked what I was seeing when it came to power usage on the laptop. I thought it'd be interesting to do some tests and see what I could find.
Here's how I setup the computer:
- Brightness = Max 100% (10)
- On Demand CPU performance on = ( echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor)
- Sound card power management enabled = (echo 1 > /sys/module/snd_hda_intel/parameters/power_save)
- File System power saving = ON ( sudo echo 1500 > /proc/sys/vm/dirty_writeback_centisecs)
First Test
Wifi-Bluetooth-Web Browser (Chromium) = ON
ATI Discrete Graphics = ON
Intel Graphics = ONd
Power Usage = 54.1W
Second Test
Wifi-Bluetooth-Web Browser (Chromium) = ON
ATI Discrete Graphics = ON
Intel Graphics = OFF
Power Usage = 59.4W
Third Test
Wifi-Bluetooth-Web Browser (Chromium) = ON
ATI Discrete Graphics = OFF
Intel Graphics = ON
Power Usage = 17.7W
Fourth Test
Wifi-Web Browser (Chromium) = ON
BlueTooth = OFF
ATI Discrete Graphics = OFF
Intel Graphics = ON
Power Usage = 17.7W
Fifth Test
Wifi-Web Browser (Chromium) = OFF
BlueTooth = OFF
ATI Discrete Graphics = OFF
Intel Graphics = ON
Power Usage = 17.3W
Last Test
Wifi-Chromium = ON
BlueTooth = OFF
ATI Discrete = OFF
Intel Integrated = ON
Power Usage=20.5W
Now a suspend was done
Power Usage after Suspend = 44.2W
So to those that were asking. The suspend bug does seem to affect this system. Powertop isn't showing whats using the extra power either. Before and after suspend wakeups seem to be consistent.
