04-12-2019
Thanks for the very detailed response Robin, this relieves some of my "unknown pain points" around the process. The P9 is in pre-production so I wanted to take the time to blow away rootvg and restore it (for documentation purposes), better now than when the system is live and something goes sideways resulting in needing to restore rootvg for which I have no proven guide to rely on.
My plan is to restore MKSYSB to the same hardware and document, so should not have any IP conflicts and such.
Into the unknown I go
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LEARN ABOUT OPENDARWIN
restoretextmode
restoretextmode(1) Svgalib User Manual restoretextmode(1)
NAME
restoretextmode - save or restore the SVGA registers for textmode.
SYNOPSIS
restoretextmode {-r|-w} filename
DESCRIPTION
The state of the SVGA is written to or restored from filename using the vga_gettextmoderegs(3) and vga_settextmoderegs(3) functions.
As of this writing this file is 385 bytes long but this might change with future versions.
Please do not fiddle with the contents of the file except when you know what you do. It might even result in hardware damage. Because of
that, you should think twice to make this command available to all users on your system.
The purpose of this program is usually to recover from a crashed console due to an svgalib, Xfree or other program bug. First save the
state of the SVGA card when on a text console. After the crash restore this state. The savetextmode(1) and textmode(1) script makes this
procedure very easy.
OPTIONS
-w filename
write the SVGA state to the file filename.
-r filename
restore the SVGA state from the file filename.
SEE ALSO
svgalib(7), vgagl(7), libvga.config(5), vga_gettextmoderegs(3), vga_settextmoderegs(3), dumpreg(1), convfont(1), fix132x43(1), restore-
font(1), restorepalette(1), runx(1), savetextmode(1), setmclk(1), textmode(1).
AUTHOR
This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced utility as well as of the
original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.
Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections
to this first version of the svgalib manual.
Svgalib (>= 1.2.11) 2 Aug 1997 restoretextmode(1)