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Old 07-21-2004, 02:34 PM   #1
mrvikki
LQ Newbie
 
Registered: Mar 2004
Posts: 21

Rep: Reputation: 15
refresh rates in X


Okay I've read through a lot of posts...one even where a guy freaked out and went back to MS Windows...and cannot find an answer to the refresh rate problem.

I just migrated from windows2K and am using the Gnome Desktop environment packaged with Slackware 10.0

I'm having a bit of trouble configuring X windows to display the correct resolution / refresh rate.

A brief history:
I installed the NVidia drivers and edited the xorg.conf file that came with slackware 10 distribution. I modified it so that it said driver "nvidia". It loaded with a nvidia splash screen and all was well. Except that the resolution was only 1024x768@60Hz. I went to the Gnome Desktop Preferences|screen resolution option. The screen resolution dialog would only let me do 1024x768 at 60Hz and 83Hz (83 caused it to be really weird looking). On windows2k the same graphics card/monitor was doing 1280x1024@75Hz.

So I text edited xorg.conf and added to all the color depths 8, 16, 24 etc "1280x1024" to the "1024x768" "800x600" etc. Everything loaded again in 1024x768@60Hz. In the screen resolution dialog, 1280x1024 did not come up.

Then I ran the xorgconfig program and ran through it picking a monitor that could do "1280x1024" @ 76.
and added the "nvidia" line to the driver. I got the nvidia splash screen and up came the desktop at 1280x1024. So apparently that added the 1280x1024 capability that I failed to do so manually entereing. HOWEVER, in the screen resolution dialog in GNOME, it will still only let me pick 60Hz. (no 75Hz option present).

Here's the first question. When I was running windows2k at 1280x1024@75Hz...is that 75Hz vertical or horizontal refresh? Windows2K never distinguished...

Also how do I get it to run 1280x1024 at the desired refresh of 75Hz? In the xorgconfig program I can only pick a monitor capable of 1280x1024@74 or 1280x1024@76 but my monitor used to run at 1280x1024@75. How can I set this so in the screen resolution dialog I can up the refresh to 75Hz from 60Hz?

Any help would be greatly appreciated.
Thanks!
Vik
 
Old 07-22-2004, 03:00 AM   #2
HappyTux
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Registered: Mar 2003
Location: Nova Scotia, Canada
Distribution: Debian AMD64
Posts: 3,513

Rep: Reputation: 69
Have you put the proper values for the Horizontal and Vertical refresh rates for your monitor in the configuration file most times in my experience the configuration program(s) usually setup very conservative rates. And you should look in the log file of X everything thing you need should be in the file if your monitor is DDC compatible and of course you are loading the ddc module in the config file when starting X, on my system the file name is /var/log/XFree86.0.log. If you cannot get it going can you post the config file you are using and the log file. To answer your question at the bottom X will use the highest refresh rate possible according to what the monitor tells it from the DDC information, the abilities of the driver used and the modes supported by the video card.

Edit: An example of what the section looks like in my config.
Code:
# KDS Visual Sensations VS 190i
Section "Monitor"
        #DisplaySize    350     265     # mm
        Identifier      "Monitor0"
        Option  "DPMS"  "true"
        VendorName      "KDS"
        ModelName       "KDS1985"
        HorizSync 30 - 95 # DDC-probed
        VertRefresh 50 - 120 # DDC-probed

Last edited by HappyTux; 07-22-2004 at 03:02 AM.
 
Old 07-22-2004, 11:29 AM   #3
mrvikki
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Registered: Mar 2004
Posts: 21

Original Poster
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how do you load the DDC module?
 
Old 07-22-2004, 12:28 PM   #4
HappyTux
Senior Member
 
Registered: Mar 2003
Location: Nova Scotia, Canada
Distribution: Debian AMD64
Posts: 3,513

Rep: Reputation: 69
Quote:
Originally posted by mrvikki
how do you load the DDC module?
Make sure it is in this section.

Code:
Section "Module"
#       Load  "GLcore"
#       Load  "dri"
        Load  "ddc"
        Load  "int10"
        Load  "bitmap"
        Load  "dbe"
        Load  "vbe"
        Load  "extmod"
        Load  "glx"
        Load  "record"
        Load  "xtrap"
        Load  "speedo"
        Load  "freetype"
        Load  "type1"
EndSection
 
  


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