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On Dienstag, 18. Dezember 2007, Walter Dnes wrote: |
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> I've figured out how to force a hard lockup on my system, by trying to |
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> log on to my ADSL service when the modem is switched off. Yeah, I know... |
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> Patient: Doctor, it hurts when I do that. |
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> Doctor: In that case... *DON'T DO THAT*. |
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> |
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> During one such lockup, I discovered that Magic SysRq doesn't work in |
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> X. For those of you who haven't heard of it... |
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> less /usr/src/linux/Documentation/sysrq.txt |
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> |
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> The feature that I wanted to access was the ability to force an |
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> emergency sync of the disks before powering off the system. This would |
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> require simultaneously pressing {ALT}{SysRq}s after which I want to |
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> force a boot with {ALT}{SysRq}b |
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> |
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the 'best' sequence is e-i-u-b (u = remount ro also syncs.. and leaves the fs |
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in a clean state). |
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To get the keyboard back from X try K (to sack X) or R (to pry it out of X |
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cold, dead fingers). |
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Another thing you can try: add something you want to be done (like switching |
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to a vt or a certain sysrq-key) to your acpid config and let acpid run. If |
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the keyboard hangs, just push the power button ... |
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for example: |
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event=.* |
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action=chvt 1 |
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in /etc/acpi/events/default switches to vt1 if you push the power button. |
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Pretty usefull, if X is in deep shit mode again. |
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-- |
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