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HPR4137: I used reisub key sequence to reboot my frozen Linux computer
In two earlier episodes I have been talking about digiKam photo
management software. I hope to come back to that topic in another
episode in the future. But not today.
Today I will talk about what happened to me about two weeks ago.
Maybe it was because I had used the hibernate state, which I rarely use,
that caused my laptop to behave somewhat strange. So I decided to turn
it off. It was my Lenovo Thinkpad T460p laptop, running Linux Mint
Debian Edition.
So I turned it off the normal way with the soft button inside the
operating system. But instead of power off I was shown a full terminal
screen with a lot of text what it was doing. But it never came to the
conclusion to turn off.
I have learned that in those situations, although tempting, that on
Linux I should not force turn off with the physical mechanical power
button. I have tried that before on another Linux laptop, and it was not
a success, rather the opposite.
What I should do with Linux is to talk with electrodes directly to
the central brain, or in other words, call the Linux kernel with help of
a system request and by that sidestep the operating system.
A System Request is done with the SysRq key on the keyboard. In this
situation I did the reisub key sequence with a system request:
If I hold the System Request key together with the Alternate Alt key,
and when still holding them down, I type the letters r, e, i, s, u and
b, one by one in a very slow pace, I take seconds between them. Then I
release all keys and the machine reboots.
This was very successful for me and the laptop has since then worked
as normal.
I use an external full size keyboard that has a System Request
key.
But not all laptops has such a key any more. System Request can be
reached also on all or most of those laptops with some key combination.
But that key combination varies between manufacturers and models.
In the show notes I add a link to a How to geek article about reisub
as well as to Wikipedia about System Request:
How-To Geek: Cleanly
Restarting Your System. Use the Magic SysRq Key on Linux to Fix Frozen X
Servers, Cleanly Reboot, and Run Other Low-Level Commands
Wikipedia: Magic SysRq
key
View all episodes
By Hacker Public Radio
4.2
3434 ratings
In two earlier episodes I have been talking about digiKam photo
management software. I hope to come back to that topic in another
episode in the future. But not today.
Today I will talk about what happened to me about two weeks ago.
Maybe it was because I had used the hibernate state, which I rarely use,
that caused my laptop to behave somewhat strange. So I decided to turn
it off. It was my Lenovo Thinkpad T460p laptop, running Linux Mint
Debian Edition.
So I turned it off the normal way with the soft button inside the
operating system. But instead of power off I was shown a full terminal
screen with a lot of text what it was doing. But it never came to the
conclusion to turn off.
I have learned that in those situations, although tempting, that on
Linux I should not force turn off with the physical mechanical power
button. I have tried that before on another Linux laptop, and it was not
a success, rather the opposite.
What I should do with Linux is to talk with electrodes directly to
the central brain, or in other words, call the Linux kernel with help of
a system request and by that sidestep the operating system.
A System Request is done with the SysRq key on the keyboard. In this
situation I did the reisub key sequence with a system request:
If I hold the System Request key together with the Alternate Alt key,
and when still holding them down, I type the letters r, e, i, s, u and
b, one by one in a very slow pace, I take seconds between them. Then I
release all keys and the machine reboots.
This was very successful for me and the laptop has since then worked
as normal.
I use an external full size keyboard that has a System Request
key.
But not all laptops has such a key any more. System Request can be
reached also on all or most of those laptops with some key combination.
But that key combination varies between manufacturers and models.
In the show notes I add a link to a How to geek article about reisub
as well as to Wikipedia about System Request:
How-To Geek: Cleanly
Restarting Your System. Use the Magic SysRq Key on Linux to Fix Frozen X
Servers, Cleanly Reboot, and Run Other Low-Level Commands
Wikipedia: Magic SysRq
key
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