Questions tagged [sysrq]

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SysRQ+B (boot) not working but O (turning off) is

For some reason, my Linux machine will properly turn off when striking SysRq+O, but won't reboot as expected when doing SysRq+B. Both of these ones show up in the help message (with SysRq+H) and all ...
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0answers
46 views

Is my disk safe after a SysRq reboot?

Every time I do a SysRq S-U-B sequence (I have tried others, too, but I suppose these are the commands that matter) my system does a full hard drive scan on the subsequent boot. Unfortunately ...
6
votes
2answers
927 views

Remapping SysRq in Linux

The designers of my new keyboard decided that for some f:in reason the PrintScreen key must sit between AltGr and RCtrl. So now I have this problem: I like having the magic SysRq key available ...
0
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1answer
265 views

What is is the bitmask for these SysRq commands?

I for the life of me still can't wrap my mind around bitmasks. I am sure they are very simple, I just haven't found something that makes how they work click in my brain yet. What would be the bitmask ...
7
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2answers
4k views

Alt+SysRq on a laptop

I have a Lenovo T410, and I would like to use the SysRq key, but whenever I press the Alt+SysRq+letter combination, I keep getting the print screen dialog in linux. Is there a way around this? I ...
9
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1answer
29k views

Does the 'sysrq' key have any function in Windows? [duplicate]

Possible Duplicate: What does the SysRq key do? Does the SYSRQ key have any function in Windows? I know it is used in Linux to pass commands directly to the kernel, and in old OSs for similar ...
15
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2answers
6k views

How to check which SysRq functions are enabled?

The file /proc/sys/kernel/sysrq contains a single number, such as: 1 (enable all SysRq commands), 0 (disable all), or a base-10 positive integer which functions as a binary bitmask, enabling a subset ...
0
votes
1answer
372 views

Linux error when resume from RAM

The last two times that I have resumed my laptop from sleep, it has hung and given me this set of errors: [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 1sec aborting [drm:...
5
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2answers
2k views

What is Sysrq+J “Thaw frozen filesystems” and why it fails?

Is it expected to unfreeze processes that are in uninterruptible sleep because of filesystem issue (NFS, FUSE, bug)? If I press Sysrq+J on my Linux, it halts the system and prints "Emergency Thaw on ...