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Thread: cannot increase refresh rate above 75hz ,

  1. #1
    Join Date
    Jul 2009
    Location
    Islamabad / Rawalpindi
    Beans
    87
    Distro
    Ubuntu 10.04 Lucid Lynx

    cannot increase refresh rate above 75hz ,

    hi
    i have dell optiplex 755 . it has builtin intel gma 3100 (not x3100) .. i cannot set it refresh rate above 75hz while resolution is set to 1280X1024..

    i would like to set the resolutio at 1152 X 960 ( dont konw the exact values but in i want a value above 1024 x 768 and below 1280 X 1024 . and at a refresh rate of 80 hz .. as i have crt and at 75 its flickering a bit..

    in windows xp i have no issue with this. i can set to 85hz ..

    i am using ubuntu 10.04 lts
    Thanks

  2. #2
    Join Date
    Jul 2009
    Location
    Islamabad / Rawalpindi
    Beans
    87
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: cannot increase refresh rate above 75hz ,

    please any help ?

  3. #3
    Join Date
    Jul 2009
    Location
    Islamabad / Rawalpindi
    Beans
    87
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: cannot increase refresh rate above 75hz ,

    ok i solved the issue .. by following this post .

    Quote Originally Posted by blackened View Post
    Reconfiguring xorg under 8.10 doesn't work anymore for almost anything (unless you have a manually configured xorg.conf and want to restore it to a clean one). Your best bet will be using xrandr to add new resolutions/refresh rates. Should be something like this:

    Find the modeline for your appropriate resolution/refresh a la:
    Code:
    cvt <hres> <vres> <refresh>
    This will spit out a modeline that you need to paste into the following command:
    Code:
    xrandr --newmode <modeline attained from cvt command>
    Then add it to the monitors listed modes (example for 1280x1024@75):
    Code:
    xrandr --addmode VGA 1280x1024_75.00
    After doing all that you should see the newly listed resolution in System->Preferences->Screen Resolution.

    Sorry if this is confusing. It's not exactly an easy thing to give examples of.

    i got a glitch when i typed the third command and then i typed the xrandr to find my default display is not vga but vga1 ..

    follow that post for if ur issue is not solved or ask me ..

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