Re: cannot seem to change refresh rate of monitor

From: Anon (Anon_at_nona.com)
Date: 10/31/04 

Date: Sun, 31 Oct 2004 01:24:11 -0400

On Sun, 24 Oct 2004 21:53:13 +0100, Philip Gaskell wrote:

> Hi,
>
> I'm having a little trouble altering the refresh rate of my monitor, I'm
> using a Philips 107E 17" CRT, I have manually edited the monitor
> sections in the xorg.conf file; it is as follows
>
> Section "Monitor"
> Identifier "Monitor0"
> VendorName "Philips"
> ModelName "107E"
> DisplaySize 360 270
> HorizSync 30.0 - 70.0
> VertRefresh 85
> Option "dpms"
> EndSection
>
>
> the values I got from http://www.i-tech.com.au/products/item792.asp. At
> the minute the refresh rate is far too slow, and changing to these
> values doesn't seem to have changed much, my machine dual boots fedora
> core 2 and win2k, in both I have a resolution of 1024*768, in win2k I
> have a refresh rate of 85Hz and I can see no flickering, how can I fix
> the flickering in fedora core 2 (gnome)?
>
> Oh, my graphics card is a S3 Trio 3D/2X, and in the hardware browser
> fedora has detected it right

Found this about your monitor:
Monitor: Philips 107E (17INCH/CM2600); frequencies: 30-70kHz horisontal,
50-120Hz vertical.
Try adding the full vertical range in your X11 file (XF86config-4 or xorg)
    HorizSync 30-70
    VertRefresh 50-120
    Option "DPMS"

After restarting X, use "xvidtune" to adjust your monitor settings.
Start xvidtune from a terminal (read the warning and don't overdrive
your monitor)
Immediately after starting xvidtune click on the "Show" button. This will
give you your current settings.
Adjust the setting to your liking and hit the show button again.
You should now have two groups of settings for use in a mode line.
Copy these two lines and edit your X11 config file and add both modelines
in the Monitor section. Here is a copy of my Monitor section:
Section "Monitor"
    Identifier "Generic Monitor"
    HorizSync 30-64
    VertRefresh 50-100
    Option "DPMS"
    # Modeline "1024x768" 78.80 1024 1040 1136 1312
    768 769 772 800 +hsync +vsync
    # Modeline "1024x768" 78.80 1024 1096 1192 1312
    768 769 772 800 +hsync +vsync
    Modeline "1024x768" 78.80 1024 1084 1180 1312
    768 769 772 800 +hsync +vsync

    # Modeline "1280x1024" 108.00 1280 1328 1440 1688
   1024 1025 1028 1066 +hsync +vsync
    # Modeline "1280x1024" 108.00 1280 1344 1456 1688
   1024 1025 1028 1066 +hsync +vsync
    # Modeline "1280x1024" 108.00 1280 1352 1464 1688
   1024 1025 1028 1066 +hsync +vsync
    Modeline "1280x1024" 108.00 1280 1340 1452 1676
   1024 1025 1028 1066 +hsync +vsync
EndSection

As you can see I have multiple modeline for different resolutions. Please
note that a modeline starts with "ModeLine" and ends with "+vsync" all on
one line (just in case the lines get wrapped or chopped).

The first modeline contains your original settings and should be
commented out with a #
The second modeline will contain your new settings and should not
be commented out.

Now restart X, if all is well then your done.

If X doesn't start then edit your X11 file again, uncomment the first
modeline (original settings) then comment out the second modeline (new
settings). Examine the logs files for possible failures and try again.
It may take a couple of trys to get the exact fit and finish you want, as
evidenced by my own Montior section, but its worth it.

Hope this helps.

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