Problem With Monitor

Post by **Zaheer** » Tue Nov 25, 2003 11:09 pm

AOA,
I got a problem after Installation of Redhat I have set the H.Size and V.Size wrong by my mistake,:(. Now whenever I boot Redhat my PC automatically shuts off and It says that V.Sync and H.Sync frequency overrange.Now how can I recover the stable positions of V. and H. of my Monitor.My monitor is a ViewSonic E50.

Plz urgent help needed,
Regards

jargon · Post by **jargon** » Tue Nov 25, 2003 11:42 pm

It just shuts off or it closes the X server?

Either way, if you still have the Redhat CD, pop it in , boot to it, and at the prompt enter rescue mode. It will require, typying "linux rescue" or something similar.

Then it will tell you how to chroot to your mounted installation , do the chroot command it shows you and using any text editor open /etc/X11/XF86Config or /etc/X11/XF86Config-4, whatever Redhat uses as the config. file for X11,

Change the values for the H & V freq., save and reboot, it should help.

Im assuming you are using Redhat 9.
Otherwise it might be a little different.
Good Luck!

zaeemarshad · Post by **zaeemarshad** » Wed Nov 26, 2003 3:12 pm

there is the XF86config tool installed along with Xserver that u can use to reset your configurations with a new set that you select in case you hate to mess with the text files although they are the easiest and the best once u are comfortable with them. i remember something like xvidtune used to be for changing monitor frequencies. I guess the best option is to edit the frequencies manually.

Note: I assume you no responsibilty of whatsoever happens if you use this information. It is correct to my knowledge and i have used it myself but i take no responsiblity of any damage caused by the use of this information.

(This information is not meant to scare you but just the extra bit of protection. I hate lawsuits!!!)

Regards
Zaeem Arshad

Faraz.Fazil · Post by **Faraz.Fazil** » Thu Nov 27, 2003 10:17 am

No problem dude.

Start linux in rescue mode from the rh9 cd, as explained earlier.
Edit /etc/X11/XF86Config file with a text editor like joe or emacs.
Browse to the Monitor section, which looks like:

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "ViewSonic E40"
DisplaySize 270 200
HorizSync 30.0 - 54.0
VertRefresh 55.0 - 100.0
Option "dpms"
EndSection

(That is for my viewsonic e40 monitor)

Set the HorizSync and VertRefresh values to required values.Save the file.
Reboot, take the cd out, boot normally and enjoy.

There are also some tools like XF86Config and XConfigurator that can do the config more easily...but they donot come installed on some distros...and i recommend the manual method..coz its so simple.

zaeemarshad · Post by **zaeemarshad** » Thu Nov 27, 2003 11:54 am

if you dont know the default values then try looking on an installation of redhat 7.2 as it configures the monitor frequencies before starting the installation. other versions 8.0 etc configure monitor frequencies after installation. Or you may take a look at any of your friendz files which may be using the default values. unfortunately i myself use custom frequencies for my Dell Trinitron which might not work for you.

Regards
Zaeem Arshad

farhanksa · Post by **farhanksa** » Thu Nov 27, 2003 12:32 pm

aoa

man there is also a backup of Xf86config.backup in /etc/X11
pls make another copy of it and rename .backup file to the older file name
and then startx

outstream · Post by **outstream** » Thu Nov 27, 2003 8:46 pm

AoA

does the backup of xf86.conf exists by default? cuz i remember when i intentionally messed with contents of xf86.conf, first i had created backup myself as there was no xf86conf.backup existed by default.

man there is also a backup of Xf86config.backup in /etc/X11

Faraz.Fazil · Post by **Faraz.Fazil** » Fri Nov 28, 2003 11:47 am

The backup is created only if you use the full gui redhat-config-xfree86 utility.

He did not mention if he used it or not.

If you edit the file manually, the backup must ofcourse be created by yourself.Thats why i always recommend backing up your settings file before messing it up.

farhanksa wrote:aoa

man there is also a backup of Xf86config.backup in /etc/X11
pls make another copy of it and rename .backup file to the older file name
and then startx

Post by **Zaheer** » Sat Dec 06, 2003 8:00 pm

AOA,
How can I go to the /etc folder to edit values from rescue disk.Reply me as soon as possible.
Regards
Zaheer

Faraz.Fazil · Post by **Faraz.Fazil** » Sat Dec 06, 2003 9:25 pm

Zaheer,

1.Boot from redhat linux cd 1
2.Choose rescue mode
3.DO a chroot /mnt/sysimage
4.Open/jump to the XF86Config file with an editor through console (terminal) .here is how:

General command: texteditorname filename

e.g for emacs:

emacs /etc/X11/XF86Config

or for joe:

joe /etc/X11/XF86Config

5.Make the changes, save the file.

6.Reboot

7.Enjoy!

8.Next time read the forum to see if your question has already been answered.

Post by **Zaheer** » Sun Dec 07, 2003 9:02 pm

AOA,
Thanks to allz I got the Solution by Faraz's method.
i m happy now cheerss

Faraz.Fazil · Post by **Faraz.Fazil** » Mon Dec 08, 2003 7:01 pm

No problem and Congrats Zaheer.

AS i said before,next time, search the forum to see if your question has already been answered.

Post by **lambda** » Thu Dec 11, 2003 3:05 pm

and if you don't have any linux cds handy, 'e' to edit the linux boot entry in grub, hit 'e' on the kernel line, add ' S' to the end of the line, hit 'b' to boot into single-user mode.

linuxpakistan.net

Problem With Monitor

Problem With Monitor

how to jump to /etc/x11/xf86config

thanks for help