Weird freeze

[Reindl Harald]

Am 20.08.2012 17:32, schrieb Aaron Konstam:
> On Mon, 2012-08-20 at 16:27 +0200, Reindl Harald wrote:
>>
>> Am 20.08.2012 16:21, schrieb Aaron Konstam:
>>> On Mon, 2012-08-20 at 16:00 +0200, Reindl Harald wrote:
>>>>
>>>> Am 20.08.2012 15:55, schrieb Aaron Konstam:
>>>>>> If a system hangs, the most important thing is to get all your data
>>>>>> written to disk, to minimize data loss. This is done by pressing "S",
>>>>>> after pressing and holding down AltGr+Prt(SysRq). An often cited and
>>>>>> well known combination (and easy to remember) is R-E-I-S-U-B. 
>>>>>>
>>>>>> Hope this helps!
>>>>>
>>>>> Well I need to ask .What key is AltGR? and Prt and SysReg are the same
>>>>> key. So what keys are you pressing?
>>>>
>>>> forget the AltGr
>>>> it is the same as CTRL+ALT and on most keyboards the right ALT-key
>>>>
>>>> CTRL+ALT+PRINT   = SysRQ
>>>> CTRL+ALT+PRINT+S = emergency sync
>>>>
>>>> http://en.wikipedia.org/wiki/Magic_SysRq_key
>>>>
>>>
>>> The web site is helpful, but the key sequences do not work.
>>> In my case I am told to press ALT + Fn + SysRg , let up on Fn and let us
>>> say press b. The system should reboot. There is a screen blink but no
>>> reboot.
>>> I can't make any of the options seem to work. What am I doing wrong?
>>
>> please post also to the list
>>
>> i am only using reply-all because moderated and it takes
>> up to days until moderators are realsing posts here....
>>
>> "Fn" sounds like a notebook
>> on many notebook-keaboards you need to press "Fn+Print" fro the
>> print-key itself, so you need "CTRL+ALT+Fn+Print+S" for emergency sync
>>
> 
> I did that. Bur CRTL+Alt+Fn+Prnt Scrn + b did not reboot the machine.
> How do you make this feature work?

/etc/sysctl.conf:
kernel.sysrq = 1

followed by "sysctl -p" at least
for security this is NOT enabled as default

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