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Old 01-20-2006, 03:01 PM   #1
itz2000
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I would like to change screen refresh rate to 75Hz

I would like to change screen refresh rate to 75Hz, and when I click on (right click) -- > Configure Desktop--> Display --> Refresh Rate there's only 60HZ without option to change!


I use Mandriva 2006 (KDE at the moment), my screen is Philips LCD 17" 170B, my Graphic card ABit Radeon 9600XT 256MB....
I think Xorg 6.9
Latest Radeon drivers are installed.


suggestions?
 
Old 01-20-2006, 03:09 PM   #2
saman007uk
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You need to enter the correct vertical and horizontal refresh rates into the xorg config file.
 
Old 01-20-2006, 04:05 PM   #3
itz2000
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where is that... and can I have an example for a settings for 75hz??
 
Old 01-20-2006, 04:16 PM   #4
Lordandmaker
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Config file's at /etc/X11/xorg.conf (note capital X).

No idea on settings for 75Hz, though.
 
Old 01-20-2006, 05:52 PM   #5
itz2000
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here's my xorg.conf...

what to change

Code:
# File generated by XFdrake.

# **********************************************************************
# Refer to the XF86Config man page for details about the format of
# this file.
# **********************************************************************

Section "Files"
    # Multiple FontPath entries are allowed (they are concatenated together)
    # By default, Mandrake 6.0 and later now use a font server independent of
    # the X server to render fonts.
    FontPath "unix/:-1"
EndSection

Section "ServerFlags"
    #DontZap # disable <Crtl><Alt><BS> (server abort)
    AllowMouseOpenFail # allows the server to start up even if the mouse does not work
    #DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
EndSection

Section "Module"
    Load "dbe" # Double-Buffering Extension
    Load "v4l" # Video for Linux
    Load "extmod"
    Load "type1"
    Load "freetype"
    Load "glx" # 3D layer
    Load "dri" # direct rendering
EndSection

Section "InputDevice"
    Identifier "Keyboard1"
    Driver "keyboard"
    Option "XkbModel" "pc105"
    Option "XkbLayout" "us,il"
    Option "XkbOptions" "grp:alt_shift_toggle,grp_led:scroll,compose:rwin"
EndSection

Section "InputDevice"
    Identifier "Mouse1"
    Driver "mouse"
    Option "Protocol" "ExplorerPS/2"
    Option "Device" "/dev/mouse"
    Option "ZAxisMapping" "6 7"
EndSection

Section "Monitor"
    Identifier "monitor1"
    VendorName "Plug'n Play"
    ModelName "Philips 170B"
    HorizSync 30-82
    VertRefresh 56-76

    # Monitor preferred modeline (60.0 Hz vsync, 64.0 kHz hsync, ratio 5/4)
    ModeLine "1280x1024" 108 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync

    # TV fullscreen mode or DVD fullscreen output.
    # 768x576 @ 79 Hz, 50 kHz hsync
    ModeLine "768x576"     50.00  768  832  846 1000   576  590  595  630

    # 768x576 @ 100 Hz, 61.6 kHz hsync
    ModeLine "768x576"     63.07  768  800  960 1024   576  578  590  616
EndSection

Section "Device"
    Identifier "device1"
    VendorName "ATI"
    BoardName "ATI Radeon (fglrx)"
    Driver "ati"
    Option "DPMS"
EndSection

Section "Screen"
    Identifier "screen1"
    Device "device1"
    Monitor "monitor1"
    DefaultColorDepth 24

    Subsection "Display"
        Depth 8
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 15
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 16
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 24
        Virtual 1280 1024
    EndSubsection
EndSection

Section "ServerLayout"
                                
    Identifier "layout1"
    InputDevice "Keyboard1" "CoreKeyboard"
    InputDevice "Mouse1" "CorePointer"
    Screen "screen1"
EndSection
what to change it to?

thanks
 
Old 01-21-2006, 04:14 PM   #6
itz2000
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Please advise... my eyes are turnning red and I'm not joking!
 
Old 01-24-2006, 03:50 AM   #7
itz2000
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guys? (random text to avoid message error)
 
Old 01-24-2006, 04:04 AM   #8
kassle
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wew ... think what you only need to set the correct monitor models
in the control panel ... duh ... dunno how in KDE, but in gnome it
is located in System Setting --> Display --> Hardware

after done back to the resolution setting, higher refresh rate
would be available

good luck
 
Old 01-24-2006, 05:39 AM   #9
Wim Sturkenboom
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These are the specs and your X configuration is correct from that perspective.

Use video timing calculator to calculate your modelines.
Select the resolution and click 'calculate' It will show a modeline under heading 4 that you can copy to your X config file (before the first modeline).
Let us know if it works.
Last edited by Wim Sturkenboom; 01-24-2006 at 06:12 AM.
 
Old 01-24-2006, 07:54 AM   #10
itz2000
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thanks
I've changed xorg.conf to this (changed only 1 line... tell me if this correct)

Code:
# File generated by XFdrake.

# **********************************************************************
# Refer to the XF86Config man page for details about the format of
# this file.
# **********************************************************************

Section "Files"
    # Multiple FontPath entries are allowed (they are concatenated together)
    # By default, Mandrake 6.0 and later now use a font server independent of
    # the X server to render fonts.
    FontPath "unix/:-1"
EndSection

Section "ServerFlags"
    #DontZap # disable <Crtl><Alt><BS> (server abort)
    AllowMouseOpenFail # allows the server to start up even if the mouse does not work
    #DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
EndSection

Section "Module"
    Load "dbe" # Double-Buffering Extension
    Load "v4l" # Video for Linux
    Load "extmod"
    Load "type1"
    Load "freetype"
    Load "glx" # 3D layer
    Load "dri" # direct rendering
EndSection

Section "InputDevice"
    Identifier "Keyboard1"
    Driver "keyboard"
    Option "XkbModel" "pc105"
    Option "XkbLayout" "us,il"
    Option "XkbOptions" "grp:alt_shift_toggle,grp_led:scroll,compose:rwin"
EndSection

Section "InputDevice"
    Identifier "Mouse1"
    Driver "mouse"
    Option "Protocol" "ExplorerPS/2"
    Option "Device" "/dev/mouse"
    Option "ZAxisMapping" "6 7"
EndSection

Section "Monitor"
    Identifier "monitor1"
    VendorName "Plug'n Play"
    ModelName "Philips 170B"
    HorizSync 30-82
    VertRefresh 56-76
    
    # Monitor preferred modeline (60.0 Hz vsync, 64.0 kHz hsync, ratio 5/4)
    Modeline "1280x1024"   135   1280 1296 1440 1688   1024 1025 1028 1066  +hsync +vsync
       
    # TV fullscreen mode or DVD fullscreen output.
    # 768x576 @ 79 Hz, 50 kHz hsync
    ModeLine "768x576"     50.00  768  832  846 1000   576  590  595  630
    
    # 768x576 @ 100 Hz, 61.6 kHz hsync
    ModeLine "768x576"     63.07  768  800  960 1024   576  578  590  616
EndSection

Section "Device"
    Identifier "device1"
    VendorName "ATI"
    BoardName "ATI Radeon (fglrx)"
    Driver "ati"
    Option "DPMS"
EndSection

Section "Screen"
    Identifier "screen1"
    Device "device1"
    Monitor "monitor1"
    DefaultColorDepth 24
    
    Subsection "Display"
        Depth 8
        Virtual 1280 1024
    EndSubsection
    
    Subsection "Display"
        Depth 15
        Virtual 1280 1024
    EndSubsection
    
    Subsection "Display"
        Depth 16
        Virtual 1280 1024
    EndSubsection
    
    Subsection "Display"
        Depth 24
        Virtual 1280 1024
    EndSubsection
EndSection

Section "ServerLayout"
    Identifier "layout1"
    InputDevice "Keyboard1" "CoreKeyboard"
    InputDevice "Mouse1" "CorePointer"
    Screen "screen1"
EndSection
Shall I keep the first mode line or it does not matter?

After I went to (right click)--> Configure Desktop --> Display --> Refresh Rate was still only 60HZ... Was it because I havn't done restart since? or maybe because I deleted the first mode line? or maybe it will stay 60HZ but will actually do 75 HZ?

Thanks alot.
 
Old 01-24-2006, 08:00 AM   #11
Dtsazza
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You will need to restart X for the changes to take effect.
 
Old 01-24-2006, 08:19 AM   #12
stress_junkie
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itz2000,
I noticed that in your first post you said that you are using an LCD monitor. There is a good chance that your monitor will not support 75 Hz. If you have shopped for monitors lately you may have noticed that they are starting to list the time that it takes for a pixel to change from white to black. Older monitors didn't tell us that because they took a long time and because they were very similar. If you want an LCD that will support 75 Hz then you will need a monitor that can change pixels from white to black in 8ms. That happens to be the fastest rate that I've seen advertised on any LCD monitors.

Any time that you change the settings for your monitor you should read the monitor's user guide. It will tell you the refresh rate, RAMDAC setting, etc. that you need to create your XF96Config modelines. If you set the refresh rate or the modeline timings too high you can destroy your monitor.

Quote:
Please advise... my eyes are turnning red and I'm not joking!
I really can't believe that having an LCD monitor at 60 Hz is hurting your eyes. That might be true in a CRT because the pixels are constantly changing brightness but an LCD doesn't do that. In an LCD all of the pixels remain at a constant brightness until the graphic card tells the pixel to change. So 60 Hz on your LCD isn't hurting your eyes. I have my LCD monitors set at 60 Hz and I use them all day without any problems.
Last edited by stress_junkie; 01-24-2006 at 08:26 AM.
 
Old 01-24-2006, 08:30 AM   #13
mr_coffee
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me too! my LCD is @ 60Hz and looks saucey.
 
Old 06-09-2019, 07:09 PM   #14
mikedelo
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Having same issue
I just bought a second monitor that needs to be set for 75Hz to get the 1920x1080 resolution.
Reading around the internet, I am still not sure what needs to be changed in my xorg file. Please help!

My xorg file.... Sorry, I do not know how to copy and paste it as done in other posts.
Attached Thumbnails
Click image for larger version Name: Screenshot.png Views: 45 Size: 42.5 KB ID: 30730  
 
Old 06-09-2019, 11:30 PM   #15
ehartman
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Quote:
Originally Posted by itz2000 View Post
I would like to change screen refresh rate to 75Hz, and when I click on (right click) -- > Configure Desktop--> Display --> Refresh Rate there's only 60HZ without option to change!
You only got (or need) 75Hz when you're still using a CRT type of display.
LCD (flat-screen) ones always only support 60Hz
 
  


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