Script to force resolution/hertz range

loadedmind · 01-24-2006, 11:32 AM

Hey all. I'm trying to create a script that will be placed into the startup for RH ES 4 so that it runs at each bootup. The script will force resolution and hertz because of what's attached. These are headless boxes all running ES 4 that are attached via keyboard/video/mouse dongles going to Avocent switches. The dongles need to ensure that the OS speaks a specific res and hertz because of the ddc information and what's supported within the firmware of the dongles. The range is 60-75 and 1024x768 res. I know I'm going to have to pipe the cat /etc/X11/Xorg.conf to something, but I get lost after I successfully grep the monitor section. I'm guessing some sort of sed statement would do the trick since I know it will always have the exact syntax, but perhaps someone has a quick and dirty fix for this?

Thanks ahead of time for putting any thought into this one.

Regards,
LoadedMind

Matir · 01-24-2006, 11:43 AM

Why don't you just permanently put it in Xorg.conf? It's not likely to change very often, is it?

loadedmind · 01-24-2006, 12:30 PM

The script would be to give out to customers that probably don't know too much about linux. That would be ideal, but now I'm trusting my customers to do this process which, in the past, they haven't been extremely detail-oriented. Trying to find the best way to ensure there are no errors on the user-side. Know what I mean?

Matir · 01-24-2006, 12:38 PM

Ah, now I understand completely. You could do something like:

Code:

TMP=`mktemp`
cp /etc/X11/xorg.conf $TMP
cat $TMP | sed 's/^[ \t]HorizSync.*$/HorizSync 60-75/' | sed 's/^[ \t]*Modes.*$/Modes "1024x768"/' > /etc/X11/xorg.conf
rm $TMP

No guarantees that will work, I just wrote it off the cuff.

loadedmind · 01-24-2006, 02:45 PM

Awesome! Thanks!

Matir · 01-24-2006, 04:38 PM

No problem. Let me know how it works out and if you don't mind, display the finished work here for anyone who has the same sort of problem.

loadedmind · 03-07-2006, 04:32 PM

Ok, I've taken that script and modified it a bunch after doing some research. This is what I've come up with so far:

----------------------------------------Begin Paste--------------------------------------------

#!/bin/bash
case "$1" in
install)
echo "Backing up and modifying /etc/X11/xorg.conf"
if test -f /etc/X11/xorg.conf
then
cp /etc/X11/xorg.conf /etc/X11/xorg-avocent.conf
XCONF="/etc/X11/xorg.conf"
cat $XCONF | sed 's/^[ \t]HorizSync.*$/HorizSync 60-75/'
| sed 's/^[ \t]*Modes.*$/Modes "1024x768"/' > /etc/X11/xorg.conf
echo blahh >> $XCONF
echo "Install Complete!"
exit
else
echo "you are not running xorg"
exit
fi
exit
;;
uninstall)
echo "Cleaning up..."
cp /etc/X11/xorg-avocent.conf /etc/X11/xorg.conf
echo "Uninstall Complete!"
exit
;;
*) echo "#########################################"
echo "# Utility to change resolution in linux #"
echo "# Please send bug reports to my ass #"
echo "#########################################"
echo ""
echo "Usage: $0 [install | uninstall]"
echo ""
exit
;;
esac
---------------------------------End Paste-----------------------------------

I realize this is pretty dirty and archaic, but I think it might actually get the job done. Thoughts? Comments?