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Based on my own experiences, sometimes I found my laptop hang after tweaked something in my Linux kernel/driver and miraculously caused it to crash. Nothing you have entered seems to work. It just “hanged” there. Before you start to reset your computer by unplug its battery or press power button to shut down, you should try the following.

Step 1:

Hold down the keys Alt and PrintScrn/SysRq.

Step 2:

While holding down the Alt and SysRq keys (there will be no visible output), type the following keys (in this order, one by one): R, E, I, S, U, B. The system will reboot after the last letter B is typed.

Each letter does a particular command and REISUB combined will enable a safe reboot. (It is not as safe as a normal reboot, but it’s far better than pushing that power button.)

Step 3:

The screen will go black and the system reboots.

This is a second to last resort (last being pushing that power button) for rebooting your computer. Do not use it if you can afford a normal reboot.

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