[BRLTTY] plea for Linux build in hodkey for crytical situations

[Mgr. Janusz Chmiel]

Dear developers and users,
I AM very sorry for my out topic question. But because Brltty can also 
help in those situations, I AM asking you.
Does somebody of us know about special build in hod key combination of 
Linux, which can cause force shutdown in The case, when Linux display 
error that error read squashfs file system while rebooting from Ubuntu.
CTRL+ALT+DEL did not work. And I have read somewhere, that Linux has 
some build in hod key which can cause force shutdown. Ideal procedure 
would be, that this routine would securely save cached data to harddisk 
or if this routine would atleast enable kernel to turn SATA or SCSI 
drives off.
Because I have been forced to apply force shut down by using power 
button and this is very un soft to The harddisk heads.
But I did not have other choice. Since Ubuntu kernel contain special 
module, which is causing harddrive heads to move constantly and The only 
one possibility toavoid Ubuntu from doing that is to use build in DISKS 
utility and activate button sleep harddrive. But I could not do that in 
The stage, whereKernel displayed error about reading from squashfs file. 
And I even could not login to The console.
Only one consoles from seven worked but last line of text was bug 
related to reading. Yes, there was also second virtual console which 
have contained crucial technical information about timers and syncing.
I will try to analyse Ubuntu to determine, which binary module is 
responsible for detecting various hod keys including CTRL+ALT+DEL or 
CTRL+ALT+Function key 1 to 12 to switch between various virtual consoles.
I will try to consult also Linux kernel developers if it is technically 
possible to provide routine for secure shutdown when kernel module which 
is responsible for working with SQUASHFS compressed Linux file system 
detect bug.
The perfect was, that even this stage, Brltty have worked for Me.
I will also try to please kernel developers, if it would not be good 
idea to include shutdown algorithm for secure harddisk shutdown in The 
case, when media, which have been used for booting The system have been 
disconnected or if it is causing non solvable I/O errors.
Any help will be very welcomed.


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