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The user's manual recommends setting a refresh rate no higher than 60Hz, but I seem to be stuck at 75. Here are the relevant sections of my xorg.conf : Code: ...
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  1. #1
    Just Joined!
    Join Date
    Sep 2007
    Location
    Philadelphia, PA
    Posts
    16

    Refresh rate on Samsung SyncMaster 932B


    The user's manual recommends setting a refresh rate no higher than 60Hz, but I seem to be stuck at 75. Here are the relevant sections of my xorg.conf:
    Code:
    Section "Monitor"
            Identifier      "Samsung SyncMaster 932B"
            Option          "DPMS"
            HorizSync       60-65
            VertRefresh     50-60
    EndSection
    Code:
    Section "Screen"
            Identifier      "Default Screen"
            Device          "nVidia Corporation NV17 [GeForce4 MX 420]"
            Monitor         "Samsung SyncMaster 932B"
            DefaultDepth    24
    Code:
            SubSection "Display"
                    Depth           24
                    Modes           "1280x1024" "1152x864" "1024x768" "800x600" "640
    x480"
            EndSubSection
    EndSection
    Here's the output of xrandr:
    Code:
     SZ:    Pixels          Physical       Refresh
    *0   1280 x 1024   ( 339mm x 271mm )  *75  
     1   1152 x 864    ( 339mm x 271mm )   75  
     2   1024 x 768    ( 339mm x 271mm )   75  
     3    800 x 600    ( 339mm x 271mm )   75  
     4    640 x 480    ( 339mm x 271mm )   75  
    Current rotation - normal
    Current reflection - none
    Rotations possible - normal 
    Reflections possible - none
    Notice that the only refresh rate option is 75Hz.

    After I did dpkg-reconfigure xserver-xorg, the horizontal sync was set to 30-65 and the vertical refresh to 50-75. I manually edited the range in the hopes it would force the desired refresh rate. Is there some reason X would be ignoring the ranges I've set?

  2. #2
    Just Joined!
    Join Date
    Sep 2007
    Location
    Philadelphia, PA
    Posts
    16
    Okay, I found a solution. I downloaded a GTF modeline generator and got the appropriate modeline for 1280 x 1024 @ 60 Hz. For anyone else trying this method, note that you should probably add
    Code:
    #include <string.h>
    to the code to avoid warnings related to the strcmp library function. So my xorg.conf now looks like this:
    Code:
    # /etc/X11/xorg.conf (xorg X Window System server configuration file)
    #
    # This file was generated by dexconf, the Debian X Configuration tool, using
    # values from the debconf database.
    #
    # Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
    # (Type "man /etc/X11/xorg.conf" at the shell prompt.)
    #
    # This file is automatically updated on xserver-xorg package upgrades *only*
    # if it has not been modified since the last upgrade of the xserver-xorg
    # package.
    #
    # If you have edited this file but would like it to be automatically updated
    # again, run the following command:
    #   sudo dpkg-reconfigure -phigh xserver-xorg
    
    Section "Files"
            FontPath        "/usr/share/fonts/X11/misc"
            FontPath        "/usr/X11R6/lib/X11/fonts/misc"
            FontPath        "/usr/share/fonts/X11/cyrillic"
            FontPath        "/usr/X11R6/lib/X11/fonts/cyrillic"
            FontPath        "/usr/share/fonts/X11/100dpi/:unscaled"
            FontPath        "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
            FontPath        "/usr/share/fonts/X11/75dpi/:unscaled"
            FontPath        "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
            FontPath        "/usr/share/fonts/X11/Type1"
            FontPath        "/usr/X11R6/lib/X11/fonts/Type1"
            FontPath        "/usr/share/fonts/X11/100dpi"
            FontPath        "/usr/X11R6/lib/X11/fonts/100dpi"
            FontPath        "/usr/share/fonts/X11/75dpi"
            FontPath        "/usr/X11R6/lib/X11/fonts/75dpi"
            # path to defoma fonts
            FontPath        "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
    EndSection
    
    Section "Module"
            Load    "bitmap"
            Load    "ddc"
            Load    "extmod"
            Load    "freetype"
            Load    "glx"
            Load    "int10"
            Load    "vbe"
    EndSection
    
    Section "InputDevice"
            Identifier      "Generic Keyboard"
            Driver          "kbd"
            Option          "CoreKeyboard"
            Option          "XkbRules"      "xorg"
            Option          "XkbModel"      "pc104"
            Option          "XkbLayout"     "us"
    EndSection
    
    Section "InputDevice"
            Identifier      "Configured Mouse"
            Driver          "mouse"
            Option          "CorePointer"
            Option          "Device"                "/dev/input/mice"
            Option          "Protocol"              "ExplorerPS/2"
            Option          "Emulate3Buttons"       "true"
    EndSection
    
    Section "Device"
            Identifier      "nVidia Corporation NV17 [GeForce4 MX 420]"
            Driver          "nvidia"
            BusID           "PCI:1:0:0"
            Option          "UseFBDev"              "true"
    EndSection
    
    Section "Monitor"
            Identifier      "Samsung SyncMaster 932B"
            Option          "DPMS"
            HorizSync       30-81
            VertRefresh     56-75
            # 1280x1024 @ 60.00 Hz (GTF) hsync: 63.30 kHz; pclk: 108.88 MHz
            Modeline "1280x1024_60.00"  108.88  1280 1360 1496 1712  1024 1025 1028 
    1060  -Hsync +Vsync
    EndSection
    
    Section "Screen"
            Identifier      "Default Screen"
            Device          "nVidia Corporation NV17 [GeForce4 MX 420]"
            Monitor         "Samsung SyncMaster 932B"
            DefaultDepth    24
            SubSection "Display"
                    Depth           1
                    Modes           "1280x1024_60.00" "1152x864" "1024x768" "832x624
    " "800x600" "720x400" "640x480"
            EndSubSection
            SubSection "Display"
                    Depth           4
                    Modes           "1280x1024_60.00" "1152x864" "1024x768" "832x624
    " "800x600" "720x400" "640x480"
            EndSubSection
            SubSection "Display"
                    Depth           8
                    Modes           "1280x1024_60.00" "1152x864" "1024x768" "832x624
    " "800x600" "720x400" "640x480"
            EndSubSection
            SubSection "Display"
                    Depth           15
                    Modes           "1280x1024_60.00" "1152x864" "1024x768" "832x624
    " "800x600" "720x400" "640x480"
            EndSubSection
            SubSection "Display"
                    Depth           16
                    Modes           "1280x1024_60.00" "1152x864" "1024x768" "832x624
    " "800x600" "720x400" "640x480"
            EndSubSection
            SubSection "Display"
                    Depth           24
                    Modes           "1280x1024_60.00" "1152x864" "1024x768" "832x624
    " "800x600" "720x400" "640x480"
            EndSubSection
    EndSection
    
    Section "ServerLayout"
            Identifier      "Default Layout"
            Screen          "Default Screen"
            InputDevice     "Generic Keyboard"
            InputDevice     "Configured Mouse"
    EndSection
    
    Section "DRI"
            Mode    0666
    EndSection
    Hopefully someone will find this useful.

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