Notebook does not power off when battery is critically low

Question

After discharging the battery completely, my notebook suspends instead of shutting down.
That happens regardless of using intel graphics or NVIDIA graphics mode on ubuntu 15.04.

Can this issue be kernel (3.19) related? Power behavior in ubuntu 14.10 (3.16) was correct.
To prevent the battery from getting damaged it is important that the machine shuts down.

As hibernation is disabled by default and not selectable in system settings, I wonder why -
power section in system settings is configured to power off the laptop - how can I fix this?

Hardware specifications:

• SCHENKER XMG Advanced (CLEVO based) notebook series

• i7-4710MQ | 16GB RAM | GTX 860M | 250GB SSD | 1TB HDD

• intel Wireless AC-7260 + Bluetooth | 77 Wh Lithium battery

• Hybrid graphics intel HD 4600 & NVIDIA GeForce + Optimus

GPU driver information:

• nvidia-* (current stable) from Proprietary GPU Drivers PPA

Output from gsettings:

$ gsettings get org.gnome.settings-daemon.plugins.power critical-battery-action
shutdown

Answer 1

感谢 @AB 和 @Serg 合作解决这个问题！
最近我们找到了问题的根源和解决方案：

• 在 Ubuntu 14.04 中，默认 gsettingscritical-battery-action设置为'suspend'.
• 在 Ubuntu 15.04 中，默认 gsettingscritical-battery-action设置为'shutdown'.
• 在 Ubuntu 15.10 中，默认 gsettingscritical-battery-action设置为'suspend'.

所以默认设置必须是'suspend'. 您可以通过在终端中执行来更改它：

gsettings set org.gnome.settings-daemon.plugins.power critical-battery-action suspend  

现在When power is critically low系统设置 GUI 中的部分不再有任何条目：

这似乎是 gsettings 中的一个错误，因为'suspend'设置会导致'shutdown'操作。
作为帮助解决这种好奇心的贡献，我在 launchpad.net 上提交了一份错误报告：

https://bugs.launchpad.net/ubuntu/+source/d-conf/+bug/1492174

更新：状态更改为“已确认”，因为该错误影响多个用户。