有时，我们所有人都不得不通过按住电源按钮直到关机来迫使电脑关机。这种机制是基于硬件还是基于固件，或者两者都是？今天的超级用户问答帖子回答了一位好奇的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户阅读器user4493605想知道什么固件或硬件机制可以实现强制关机：

Although I am not entirely certain about this, I am pretty sure that pushing and holding the power button down on all computers will force them to shut down after varying lengths of time. This is particularly useful if the computer freezes or some other error necessitates a total reboot.

What I am interested in is whether this forced shutdown mechani** is hardcoded into the computer’s underlying firmware or built into the computer on a hardware level. If the mechani** is firmware-based, then it is logical to assume that a CPU-level error would prevent this mechani** from properly triggering, which leads me to believe that this is a hardware function.

To summarise, is the universal forced shutdown mechani** built in at the hardware or firmware level? Can someone elaborate on the mechani**’s nature, variants, and general history.

什么固件或硬件机制允许强制关机？

答案

超级用户贡献者DavidPostill为我们提供了答案：

Is the universal forced shutdown mechani** built in at the hardware or firmware level?

Both the motherboard (hardware) and the BIOS (firmware) are involved in the process.

Source: How Does the Power Button Work?

Source: How Do These Modern Power Butt*** on Devices Work? (Answer by Olin Lathrop)

有什么要补充的解释吗？在评论中发出声音。想从其他精通技术的Stack Exchange用户那里了解更多答案吗？在这里查看完整的讨论主题。

图片来源：Josh Swannack（Flickr）