Power consumption sampled with powerstat on 201208-11536 Dell Latitude
6430u
Sample rate: 15s, with 360 data points (90 min)
Result:
A. Without the "options snd-hda-intel power_save_controller=N"
1. with "sudo pm-powersave false"
4.18 Watts on Average with Standard Deviation 0.27
2. with "sudo pm-powersave true"
4.17 Watts on Average with Standard Deviation 0.24
B. With the "options snd-hda-intel power_save_controller=N"
1. with "sudo pm-powersave false"
4.13 Watts on Average with Standard Deviation 0.20
2. with "sudo pm-powersave true"
4.13 Watts on Average with Standard Deviation 0.17
Hardware config:
This is a laptop with SSD, with wireless card removed, and Media Card / Mic /
Camera / WWAN / WLAN / BT disabled in BIOS.
System settings:
* 14.04.1 + update
* auto update disabled
* no lock after sceen off
* idle time set to 1min
* Keyboard backlight off
* screen backlight set to minimum
* ifconfig will be disabled later
Scenario:
1. With laptop powered off, disconnect the cable after the battery is fully
charged
2. Power it on around 5 seconds later after unplugging the adapter
3. Run a test script manually right after boot into desktop:
#!/bin/bash
sudo ifconfig eth0 down
sudo pm-powersave false
powerstat 15 360 | tee 1-powersave-false
4. Leave it there for 90 minutes, then modify the script (or add parameter) for
next cycle, power off.
Attachment is the test report and the alsa-base.conf config file
Please double confirm this with another tester.
Thank you
** Attachment added: "powerstat.tar.gz"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1383997/+attachment/4340960/+files/powerstat.tar.gz
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https://bugs.launchpad.net/bugs/1383997
Title:
HDMI audio hot-plug detection does not work well with laptop running
on battery with 14.04
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