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- 4.4-rc1 XPS 13 9350 with wifi on, screen brightness 50%, idling
- - Running just "powerstat" to get actual battery drain wattage :
- Time User Nice Sys Idle IO Run Ctxt/s IRQ/s Watts
- 23:57:59 0.2 0.0 0.1 99.6 0.0 1 108 37 7.01
- 23:58:09 0.1 0.0 0.1 99.8 0.0 1 96 35 6.86
- 23:58:19 0.1 0.1 0.1 99.8 0.0 1 86 28 6.81
- 23:58:29 0.1 0.1 0.1 99.8 0.0 1 96 37 6.85
- [...]
- 00:02:29 0.1 0.1 0.1 99.8 0.0 1 101 36 6.83
- 00:02:39 0.1 0.0 0.1 99.8 0.0 1 81 28 7.18
- 00:02:49 0.2 0.1 0.1 99.7 0.0 1 88 30 6.95
- -------- ----- ----- ----- ----- ----- ---- ------ ------ ------
- Average 0.1 0.0 0.1 99.8 0.0 1.0 92.5 31.3 6.91
- StdDev 0.1 0.0 0.0 0.1 0.0 0.0 13.7 4.3 0.11
- -------- ----- ----- ----- ----- ----- ---- ------ ------ ------
- Minimum 0.1 0.0 0.1 99.6 0.0 1.0 76.7 24.5 6.81
- Maximum 0.2 0.1 0.1 99.9 0.0 1.0 153.6 44.2 7.18
- -------- ----- ----- ----- ----- ----- ---- ------ ------ ------
- Summary:
- 6.91 Watts on average with standard deviation 0.11
- - So far, nothing new. Battery drainage around 7W which amounts roughly to 6-7 hours battery life, not great. Windows 10 reported more, around 9-10. Here's the part that gets interesting. There is a way to run powerstat to get directly the componentwise energy consumption which is what powercfg does.
- Running the command "powerstat -RD" gives the following :
- Time User Nice Sys Idle IO Run Ctxt/s IRQ/s Watts dram uncore core pkg-0
- 23:52:19 0.3 0.1 0.1 99.5 0.0 1 197 68 1.86 0.52 0.03 0.04 1.86
- 23:52:29 0.1 0.1 0.1 99.8 0.0 1 94 34 1.94 0.51 0.00 0.14 1.94
- 23:52:39 0.1 0.0 0.1 99.9 0.0 1 91 27 1.79 0.51 0.00 0.02 1.79
- 23:52:49 0.1 0.1 0.0 99.9 0.0 1 86 31 1.78 0.51 0.00 0.01 1.78
- 23:52:59 0.0 0.1 0.1 99.9 0.0 1 83 25 1.81 0.51 0.00 0.03 1.81
- 23:53:09 0.1 0.0 0.1 99.8 0.0 1 101 35 1.80 0.51 0.00 0.02 1.80
- -------- ----- ----- ----- ----- ----- ---- ------ ------ ------ ------ ------ ------ ------
- Average 0.1 0.0 0.1 99.8 0.0 1.0 108.7 36.6 1.83 0.51 0.01 0.04 1.83
- StdDev 0.1 0.0 0.0 0.1 0.0 0.0 40.1 14.7 0.05 0.00 0.01 0.05 0.05
- -------- ----- ----- ----- ----- ----- ---- ------ ------ ------ ------ ------ ------ ------
- Minimum 0.0 0.0 0.0 99.5 0.0 1.0 83.4 24.6 1.78 0.51 0.00 0.01 1.78
- Maximum 0.3 0.1 0.1 99.9 0.0 1.0 197.4 68.4 1.94 0.52 0.03 0.14 1.94
- -------- ----- ----- ----- ----- ----- ---- ------ ------ ------ ------ ------ ------ ------
- Summary:
- 1.83 Watts on average with standard deviation 0.05
- Note: power read from RAPL domains: dram, uncore, core, package-0.
- These readings do not cover all the hardware in this device.
- - This is very interesting because it means that CPU + GPU only take around 2W in Linux. powercfg in Windows 10 indicated that the CPU + GPU took around 3W (see here : https://twitter.com/cheddarpirtelo/status/668184552209297408 ), so the CPU + GPU takes even less power in Linux than Win10! Yet the total energy consumption in Linux seems to be around 7W?? How can this be? Some component(s) is hogging the remaining 5W not attributed to CPU + GPU. Disabling the wifi, bluetooth, lowering brightness do not help much so the only cause I see here is the SSD!
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