How To Fix Sysrq Not Working (Solved)

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Sysrq Not Working

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Sync is great when your system is locked up, it allows you to 's'ync your disks and will certainly lessen the chance of data loss and fscking. What you’ll need You’ll probably want a kernel that’s not old enough to remember the time when there were only three Star Wars films. For the purpose of magic SysRq, the SysRq key is whichever key sends the scan code 99. Not the answer you're looking for?

SysRq and Print Screen share a key. The Magic SysRq system works by registering key operations against a key op lookup table, which is defined in 'drivers/char/sysrq.c'. In a bold departure from tradition, Thinkpads have recently been bereft of that oft neglected key. The SysRq key is usually the same key as PrintScreen. More hints

This Sysrq Operation Is Disabled

It may work for all of your keyboards, though. Some keyboards may not have a key labeled SysRq. Adv Reply March 17th, 2012 #3 veroslav View Profile View Forum Posts Private Message Way Too Much Ubuntu Join Date Aug 2010 Location Sweden Beans 269 DistroUbuntu 12.04 Precise Pangolin

Ubuntu Desktop You press the key combo Alt + SysRq + command key. Thanks. I'd say if you can't find the logs, try REISUB again and extract the logs. /proc/sys/kernel/sysrq Offline #5 2014-05-13 13:02:33 bdantas Member Registered: 2014-05-13 Posts: 85 Re: Alt+SysReq REISUB not working @IMBJR - I am struggling with the same issue.

The last few examples of Magic SysRq were spectacularly destructive. Reisub Not Working Most modern Linux distributions include support for the Magic SysRq keystrokes compiled into the base kernel. Tango Icons Tango Desktop Project. UNIX is a registered trademark of The Open Group.

With this feature, you can enable only the hardware-triggered commands that you’re willing to suffer the consequences of. Reisub Ubuntu ALL UNANSWERED Ask Your Question 1 SysRq R E I S U B is not working. One cannot simply(TM) type "sudo reboot" once the machine is unresponsive, let alone switch to a workspace with an open terminal. You can follow his misadventures on his blog www.TheNubbyAdmin.com or if you have a short attention span, his Twitter account @Nonapeptide.

Reisub Not Working

If your keyboard doesn't have a key labeled SysRq or PrintScreen, it may not have a key that sends the scan code that Linux expects. So, I don't understand the upvotes of this answer because it's about a very short period period in time (see the bug report). ;) –gertvdijk Aug 17 '13 at 22:38 1 This Sysrq Operation Is Disabled How to get Alt+SysRq+B to work as expected (reboot)Thanks! Kernel.sysrq = 176 See important comments below in SAK section. 'l' - Shows a stack backtrace for all active CPUs. 'm' - Will dump current memory info to your console. 'n' - Used to

For details and our forum data attribution, retention and privacy policy, see here UbuntuCommunityAsk!DeveloperDesignDiscourseHardwareInsightsJujuShopMore ›AppsHelpForumLaunchpadMAASCanonical current community chat Ask Ubuntu Ask Ubuntu Meta your communities Sign up or log in to Intel Core i7 860 2,8 GHz - 8 GB DDR3 - 1,5 TB SATA 3G - nVidia GeForce GTX 260 1,8 GB - Ubuntu 12.04 Precise Pangolin Adv Reply March How do I get the last lines of dust into the dustpan? October 11, 2016 Making the Most of Attending a Tech Conf... This Sysrq Operation Is Disabled Ubuntu

That's about it. Reply Leave a Reply Cancel reply Comments are moderated and not published in real time. And I can use it under i3 when the machine is responsive -- but that's not when you want to use it. LightDM seems to be the part of the problem, as stopping it first (# systemctl stop lightdm) before trying the magic key sequence causes Alt+SysRq+E to work as expected.

PrtSc and SysRq are on the same key. No Sysrq Key On Keyboard Unfortunately, I didnt't see any output after I pressed 'B', if it printed something, it must have been very short message, because as soon as I pressed 'B', the screen went I managed to boot it the next time without any problems.

Now that you've identified a scan code, run setkeycodes … 99 as root to assign that scan code to key code 99.

You might have to do some keystroke hokey-pokey to see if your hardware can only handle a limited amount of keystrokes. Offline #6 2014-05-13 13:08:57 lucke Member From: Poland Registered: 2004-11-30 Posts: 4,018 Re: Alt+SysReq REISUB not working There's "Restart=Always" in /usr/lib/systemd/system/lightdm.service, so the only process left running, systemd, restarts lightdm.Rebooting works So if SysRq doesn't work out of the box for a certain keyboard, run 'showkey -s' to find out the proper scancode sequence. Reisub Doesn't Work This page was last modified on 27 February 2015, at 00:08.

Then use 'setkeycodes 84' to define this sequence to the usual SysRq code (84 is decimal for 0x54). In some distributions of Linux, the kernel loglevel is too low to display SysRq output. If understood properly, it can be a very useful tool in an administrator’s careful hands. A help_msg string, that will print when SysRQ prints help An action_msg string, that will print right before your handler is called.

my F12 key. However, some OSs still use it for their own purposes. To make this change permanent, either add the setkeycodes command to /etc/rc.local, or configure udev to change the keycode mappings. Last edited by bdantas (2014-05-13 13:41:39) Offline #10 2014-05-13 16:05:57 IMBJR Member From: INDCMPLX Registered: 2014-03-16 Posts: 75 Re: Alt+SysReq REISUB not working With the /usr/lib/systemd/system/lightdm.service mod in place, I've made

For a bit more context, 1984 was one year after the PC/XT had been released. In that case, a sequence of Magic SysRq commands would be in order. B should immediately reboot your system, same as if you'd hit the reboot button (in a slightly less controlled way, of course). Really.

And if you don't understand the upvotes, then why don't you explain why you don't? –gertvdijk Aug 17 '13 at 22:37 Considering James confirms all sysrq commands work with I was allowed to enter the airport terminal by showing a boarding pass for a future flight. See what was logged. October 24, 2016 Changing direction: Pingdom's new ...

Should I use Alt-key with Prnt Scr or only Prnt Scr? /Veroslav Intel Core i7 860 2,8 GHz - 8 GB DDR3 - 1,5 TB SATA 3G - nVidia GeForce GTX The following sequence works on all the laptops I've seen: Press and hold Alt. Does boiling tap water make it potable? You should use them only as last resorts and only if you know what you’re doing.

Next, Alt+SysRq+u will remount all disks as read only. The full list of SysRq operations that can be allowed or disallowed is in the SysRq documentation, but I’ll reproduce them here for ease.