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Old 09-16-2004, 05:52 PM   #1
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Registered: Sep 2004
Distribution: RedHat 6.2
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how to change screen resolution ?


I tried to change the resolution of screen from 800x640 to 1024x768 but no results ..

I am pasting below the relevant sections of the file /etc/X11/XF86Config .. and the changes (preceded by > ) that I made:

# 800x600 @ 100 Hz, 64.02 kHz hsync
Modeline "800x600" 69.65 800 864 928 1088 600 604 610 640 -HSync -VSync

># 1024x768 @ 76Hz, 62.5 kHz hsync
>Modeline "1024x768" 85 1024 1032 1152 1360 768 784 787 823 ->HSync -VSync

Subsection "Display"
Depth 16
> Modes "1024x768" "640x480" "800x600"
ViewPort 0 0

Section "Screen"
Driver "vga16"
Device "Generic VGA"
Monitor "My Monitor"
Subsection "Display"
> Modes "1024x768" "640x480" "800x600"
ViewPort 0 0

My monitor is AOC Spectrum 7Vlr. It supports upto 1280x1024. The video card: SiS 86C326 (rev 0B). I think the video card is capable of high resolution..

What else do I need to do to get 1024x768 resolution ...

Please help.. Thanks in advance..
Old 09-16-2004, 06:44 PM   #2
Registered: Apr 2002
Location: earth
Distribution: slackware by choice, others too :} ... android.
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Unless you happen to have a XF86Config-4 with
different values as well that should do the trick.

You can check which config file the server uses
by looking at /var/log/XFree86.0.log ...

Btw, if you added your distro to your profile
that would give people a better idea as to where
to start looking ;)

Old 09-16-2004, 06:45 PM   #3
Registered: Oct 2003
Location: North Carolina, USA
Distribution: Slackware 11
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For starters, vga16 is a pretty basic driver IIRC. It may not allow your card (even though it's kind of old) to do as much as you would like.

I would recommend:

1) BACKING UP your existing /etc/X11/XF86Config

2) run xf86config as root and choose your video card and monitor settings properly

Then you can mess with getting your modes working correctly.

Now, caveat, I run Slackware so I'm not exactly sure if these steps will work for you (hence step 1 being to backup existing file).

Also, regarding monitor settings, BE CAREFUL. If you don't have your actual HSync and VSync numbers don't just take wild some research with Google or whatever and get the actual HSync and VSync numbers.

Most modern monitors will not allow themselves to be damaged by out-of-range settings but it's always best not to test their self-preservation settings.

If you REALLY want to try it then choose some very conservative settings from the monitor list in xf86config and see how you fare.

Last edited by 187807; 09-16-2004 at 06:47 PM.
Old 09-17-2004, 10:27 AM   #4
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Registered: Sep 2004
Distribution: RedHat 6.2
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I dont have the XF86Config-4 file. I am running Red Hat 6.2. I think I will just stick with this resolution for now and work on the settings in the weekend so it doesnt hamper my days work.

Thanx for your inputs again.
Old 08-20-2012, 09:19 AM   #5
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If using 6.2 this is the solution I have came to that does work. Assuming you have tried xrandr, and system-config-display with no solution and you have the xorg.conf.d and no xorg.conf file.

Go to /etc/X11/xorg.conf.d and 'vi 10-screen.conf' (name of file really doesnt matter but you need the .conf part) and add the following in:

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" "800x600" "640x480"


After doing this restart the machine and let me know if it worked for you.


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