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Thread: MagicSysRq keys for assistance with Ubuntu troubles

  1. #21
    Join Date
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    Re: MagicSysRq keys for assistance with Ubuntu troubles

    Does anyone know how to type Alt Sysrq on a Macbook Pro?

  2. #22
    Join Date
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    Ubuntu Jaunty Jackalope (testing)

    Wink Re: MagicSysRq keys for assistance with Ubuntu troubles

    For what it is worth, and for completeness sake, there are a couple more interesting sysRq you could use in order to dump some info whenever you have been "frozen out":

    'ALT+SysRq+ 0'-'9' - Sets the console log level, controlling which kernel messages will be printed to your console., so that you don't get flooded.

    'ALT+SysRq+m' - dumps memory info to your console

    'ALT+SysRq+p' - dumps the current registers and flags to your console

    'ALT+SysRq+q' - dumps all timers info to your console

    'ALT+SysRq+t' - dumps a list of current tasks and info to your console

    'ALT+SysRq+w' - dumps uninterruptable (blocked) state tasks.

    Also worth pointing out imo:

    'ALT+SysRq+k' - Is the "Secure Access Key" (SAK), which kills all programs on the current virtual console. In the OP it says "It is a bad idea to do this on a console where X is running. The GUI will stop and you cant see what you type", but it should be pointed out that it is a VERY good idea to use it at a tty if you want to be sure there is no trojan program running at console in order to could grab your password when you login.
    It will kill all programs on given console and make sure that the login prompt you see is actually the real init and not a trojan!

    Cheers!
    Retire, miscreants, to your muddy billabongs and forget even passive attempts to educate windozian zombies: how can those of easy virtue, who simply stroll into a store and "buy" programs off the rack, compare to us?

  3. #23
    Join Date
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    Kottawa, Sri Lanka
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    Ubuntu 10.04 Lucid Lynx

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    I added the magic SysRq keys mentioned by Cannaregio. Thank you Cannaregio.
    Think carefully before executing commands containing "rm", especially "sudo rm -rf ", if you require more information concerning this matter, read this.
    I am an experimenter, give me the most stable OS and I can make it unstable in a few hours.

    C == seriously fast == FTW!

  4. #24
    Join Date
    Nov 2007
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    Winston Salem, NC, USA
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    Ubuntu

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    What's a guy to do when he's on a laptop and must use a "Function" key to access system keys such as "Print Screen" and such? Once I hold down the "Function" key, it disables all of the basic keys (such as Alt). What's the safest way to shut down a frozen laptop like mine?

    Or do I just need to pull the plug and pray?

    Thanx!
    gotee12
    Professional Ubuntu Noob

  5. #25
    nikoPSK is offline Chocolate-Covered Ubuntu Beans
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    Ubuntu 8.04 Hardy Heron

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    Quote Originally Posted by gotee12 View Post
    Or do I just need to pull the plug and pray?
    LOL, that's windows.

  6. #26
    Join Date
    Jan 2008
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    4

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    Thank you for great document.

    By the way, according to Wikipedia, safe reboot is R+E+I+S+U+B.
    see http://en.wikipedia.org/wiki/Magic_S...sing_Elephants

    What it is difference from the key stroke in the thread?
    Should I execute Sync command before Term and Kill or after Term and Kill?

  7. #27
    Join Date
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    Ubuntu 10.04 Lucid Lynx

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    Well, I do not know the true difference, but I think it is always better to write the data to the hard disk before terminating and killing the processes.
    Think carefully before executing commands containing "rm", especially "sudo rm -rf ", if you require more information concerning this matter, read this.
    I am an experimenter, give me the most stable OS and I can make it unstable in a few hours.

    C == seriously fast == FTW!

  8. #28
    Join Date
    Jan 2008
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    73
    Distro
    Ubuntu 7.10 Gutsy Gibbon

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    Quote Originally Posted by gotee12 View Post
    What's a guy to do when he's on a laptop and must use a "Function" key to access system keys such as "Print Screen" and such? Once I hold down the "Function" key, it disables all of the basic keys (such as Alt). What's the safest way to shut down a frozen laptop like mine?

    Or do I just need to pull the plug and pray?

    Thanx!
    I second this question... holding this key combination ends up endlessly populating my printscreen dialogs... alt+fn+insert(prt sc)

  9. #29
    Join Date
    Nov 2007
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    38

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    I have the same problem.
    Is thera a way to find out the equivalent keys in different laptos/keyboard?

  10. #30
    Join Date
    May 2006
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    Kubuntu Karmic Koala (testing)

    Re: MagicSysRq keys for assistance with Ubuntu troubles

    Quote Originally Posted by jdc View Post
    Does anyone know how to type Alt Sysrq on a Macbook Pro?
    I would love to see this answered!

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