Key combinations made with alt, the sysrq key and another key are executed by the kernel whatever the state of the system; if it is frozen the classic command is to combine alt and the sysrq key with REISUB, which will safely close processes and reboot the system.

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Can Magic SysRq be used to switch workstations or kill specific processes?

My PC, running Ubuntu from a live CD, is frozen. I think it's because I have too many Firefox tabs open, which is overloading my memory. Is there anyway to use Magic SysRq to only kill Firefox? Or to ...
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Does the Magic SysRq Key Always Work?

My computer is running Ubuntu from a Live CD and is frozen to the point where I can't even turn num lock on and off. Does the Magic SysRq key work even now? And is it something that's enables by ...
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251 views

REISUB not working when Ubuntu freezes

I am using 12.04 LTS on a Dell Inspiron 15 3521. Whenever the system hangs up with keyboard becoming unresponsive, REISUB does not give any results. Now I edited etc/sysctl.conf file as was suggested ...
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Alt-SysRq-E kills init

NOTE: Yes, I have a QWERTY keyboard. I also fully enabled SysRq with echo 1 > /proc/sys/kernel/sysrq while root earlier. Tonight my laptop froze up while having Chromium and Minecraft open. After ...
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How can I troubleshoot why Ubuntu keeps crashing on my laptop?

I have a one year old Acer Aspire 4752G netbook running Kubuntu 12.04 LTS with all the latest distribution updates installed. It was previously running great until about a week ago when it suddenly ...
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How do I diagnose Hang on Shutdown?

Since one or two months ago, my laptop with ubuntu 12.10x64 hangs during shutdown. There's just a black screen, no harddisk activity, it justs sits there. I feel it happens near the end of a normal ...
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206 views

How to give control over keyboard back to X server after Alt + SysRq + R trick

Situation: an application freezes the X server and no keyboard input works. So I use Alt+SysRq+R to take the keyboard out of raw mode (make the kernel take control of the keyboard away from the X ...
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How to get Alt+SysRq work on a Dell Latitude E6530?

I have a Dell Latitude E6530. The keyboard has a SysRq key (Fn+Home). However the magic keys (especially the famous REISUB) doesn't work. SysRq is enabled in /proc/sys/kernel/sysrq (I get 1 if I cat ...
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Shut down computer from keyboard

Is there a keyboard shortcut available to shutdown the computer? I know I can use the Power button, but I would like to be able to it from the keyboard. If such a shortcut does not exist already, ...
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ALT+SysRq+REISUB hangs at “resetting” (without actually resetting/restarting)

I'm trying Alt + SysRq + REISUB to see how it would be used to restart my system safely in case of emergency. However, I find that Alt + SysRq + REISUB hangs at "resetting" (without actually ...
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Alt + sysrq + REISUB doesn't reboot my laptop

On occasion, my laptop has become stuck so I've used the magic key combination of Alt + SysRq + REISUB to perform a safe reboot. However, it doesn't seem to work for me as when I press the B key to ...