Tagged Questions

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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16 views

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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2answers
33 views

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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1answer
154 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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0answers
75 views

map sysrq to a key other than AltrGr+prtscr

the keyboard layout on my laptop (lenovo x230 or t430s) makes it too easy to trigger magic sysrq, since AltGr and prtscr keys are right beside each other. i've disabled magic sysrq because i'd often ...
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2answers
105 views

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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1answer
3k views

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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2answers
4k views

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 ...
2
votes
1answer
170 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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2answers
2k views

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 ...
31
votes
16answers
93k views

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, ...
7
votes
1answer
296 views

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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5answers
9k views

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 ...