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I have enabled SysRq in the kernel like this:

#echo 1 > /proc/sys/kernel/sysrq 

and confirmed that it worked.

Fn-F1 is my SysRq key, but every time I press Alt-Fn-F1 and any other letter that should go here like t it doesn't work. It just takes a screenshot. Even pressing r takes a screenshot.

It this common? How do I get around this? I'm using Fedora 16

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Did you follow the tips on Magic SysRq Key ? – Mat Dec 27 '11 at 12:30
Are you releasing Fn (and Alt and F1) before you press t? If you're not, you may be pressing Fn+t instead. And what do you mean by “takes a screenshot”? That sounds like a software thing, triggered by pressing a key, so what key would trigger a screenshot in your setup? – Gilles Dec 27 '11 at 23:21
I press Alt then Fn then F1 then t, in that order holding down each preceding key until the sequence is complete – rubixibuc Dec 28 '11 at 5:04
No one seems to have mentioned it yet, but it may be relevant that on almost all keyboards I have seen, SysRq shares a physical key with PrintScreen, and the Fn key may be required to get SysRq on laptops. – jw013 Feb 14 '12 at 17:52

If you have a laptop which requires you to press an Fn key to activate the Sysrq key then press Alt-Fn-Sysrqkey let go of Fn then press the required key or key combo

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Don't forget to accept your answer if it is the correct one. – jw013 Feb 14 '12 at 17:52

In order to avoid screenshot, use CTRL+sysRq+key.

E.g., you would have to press CTRL+Fn+F1, release Fn and then press M to show the memory usage.

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