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Thread: Change screen resolution in 9.04

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  1. #1
    Join Date
    Oct 2005
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    96

    Change screen resolution in 9.04

    Much to my surprise, I managed to get Ubuntu 9.04 working on an old Mac G4. The only thing wrong so far is that I can't figure out how to change the screen resolution, which is currently at 800x600. The System>Preferences>Display app doesn't give me any options but 800x600 and 640x480 even though the monitor is happy at higher resolutions. My monitor is a Sony Multiscan 17sfII which runs 1024x780 @ 75hz on the same Mac with no trouble. I tried an earlier version of Kubuntu (6.10) which had a bunch of monitor profiles with it and I was hoping this distro did too, but if it does I can't find them.

    Isn't there a prefs file somewhere I can edit to deal with this cramped display? Sorry if this is newbie stuff, but really, in linux terms, that's what I am.

  2. #2
    Join Date
    Jan 2006
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    Re: Change screen resolution in 9.04

    You'll need to manually edit your /etc/X11/xorg.conf file.

    First, make a backup of the original:

    Code:
    sudo cp /etc/X11/xorg.conf  /etc/X11/xorg.conf.bak
    (note the Capital X)

    From a terminal, you can edit the original with root priveleges:

    Code:
    gksudo gedit /etc/X11/xorg.conf
    There might be next to nothing inside, but don't worry.

    The specs for your monitor were found, and I suggest adding these lines to your xorg.conf:

    Code:
    Section "Monitor"
            Identifier      "Configured Monitor"
            HorizSync       31-65
            VertRefresh     50-120
    EndSection
    
    Section "Screen"
            Identifier      "Default Screen"
            Monitor         "Configured Monitor"
            Device          "Configured Video Device"
            DefaultDepth    24
                 SubSection      "Display"
                    Viewport        0 0
                    Depth           24
                    Modes           "1280x1024"
                 EndSubSection
    EndSection
    Be mindful of what lines need start and end-quotes, and those line that don't need quotes.

    Save the file, quit the editor, and then use the logout function to restart X. Or you could just restart the computer. There are other ways to do this, but as a start, this is easiest.

    Let us know how it goes!
    Last edited by stream303; May 9th, 2009 at 10:33 PM.
    20" G5 iMac - AMD64 HP desktop
    http://www.ppclinux.info/

  3. #3
    Join Date
    Oct 2005
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    96

    Re: Change screen resolution in 9.04

    THANK YOU SO MUCH.

    I'm copying this onto my main Mac so I can do this when I reboot the Ubuntu system later this morning. I read a little on this and as a result I was so afraid of messing with the xorg.conf file that I ALREADY backed it up!

    Very helpful; thank you again.

    UPDATE: I got it working, thanks to your help! I first simply added the monitor but didn't realize I needed to comment out the duplictaed portions of the original. When I did that and rebooted I got the high resolution screen. And now I also see a bunch of other resolutions supported, too.

    This is just great.

    Thanks again!
    Last edited by Benboom; May 9th, 2009 at 03:55 PM. Reason: Formatting

  4. #4
    Join Date
    Oct 2005
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    96

    Re: Change screen resolution in 9.04

    Issue solved!
    Last edited by Benboom; May 9th, 2009 at 03:56 PM.

  5. #5
    Join Date
    Oct 2005
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    96

    Re: Change screen resolution in 9.04

    Issue solved! Typing this on large screen!
    Last edited by Benboom; May 9th, 2009 at 04:02 PM.

  6. #6
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    Re: Change screen resolution in 9.04

    Wow - that usually doesn't happen. I thought for sure that this was just an exercise to something larger. I'm glad it worked right off the bat.

    Which machine do you have?
    http://www.everymac.com/systems/appl...wermac-g4.html

    Also, normally I just check to make sure that System > Preferences > Appearances > Fonts > Subpixel smoothing is checked for lcd's and In the details tab I run "slight" hinting.
    20" G5 iMac - AMD64 HP desktop
    http://www.ppclinux.info/

  7. #7
    Join Date
    Oct 2009
    Location
    Europe
    Beans
    7
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Change screen resolution in 9.04

    Hey thanks that worked for me i know have an acceptable resolution just wondering though, Was that only for the g4 mac specs? I'm using a fujitsu siemens v5535 just seems to be a lil sluggish maybe its the refresh rate idk. Thanks again i will have a little play around and see if it can be improved!

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