That sounds weird, as none of those keys is the SysRq key. But if it works ...
Another issue that may happen with this SysRq use is with non-qwerty keyboards. If you use a non-qwerty keyboard, use the keys where REISUB would have been if it were a qwerty-keyboard.
The short delay between the keys is to give the software time to respond. If you're too fast, you may get damaged files. The functions of the keys are:
R - Switch the keyboard from raw mode to XLATE mode. I'm not sure what that means exactly.
E - Send the terminate signal to all processes except init. This is a kind request for those processes to terminate, giving them opportunity to save files. They may need some time for this.
I - Send the kill signal to all processes except init. This terminates all remaining processes (except init) immediately.
S - Sync, flushes all file changes to permanent storage. This may take some time.
U - Remount filesystems in read-only mode. This blocks further writes to the filesystem.
B - Reboot.
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Originally Posted by Impavidus
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