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Thread: HOWTO: change resolution/refresh rate in Xorg

  1. #41
    Join Date
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    Finland
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    Hardy Heron (Ubuntu Development)

    Re: HOWTO: change resolution/refresh rate in Xorg

    Quote Originally Posted by smokinfish
    But I don't know all that stuff about my monitor - it's just the screen attached to my laptop - which is a Sony Vaio PCG-R600HMPD
    Find your laptops manual in Sonys support pages, check the specification sheet / page for details of display.
    http://esupport.sony.com/perl/select...?DIRECTOR=DOCS

    Alternatively you can try to run sudo ddcprobe and sudo xresprobe vesa to get more information. Also command lspci | grep -i vga may reveal some useful information.

    If I'd have to guess, your problem with resolution is driver related, not about monitor setting (vertrefresh/horizsync). In my experience that's more common with CTR monitors.

    It's not really that difficult to tweak xorg.conf file, lots of Linux newbies have succeeded. Yes, it's a shame that autodetection fails every now and then, but making a tool to guess some settings and correcting xorg.conf would be fixing the problem at the wrong end and it would never be ready.

    A howto page and helpful community forum is a more flexible (even though burdensome) solution until the problem has been fixed by time (old monitors do not autodetect) and programmers. Some distributions make it easier. Buying a preinstalled computer with Linux on it, makes it a non-problem. If this discussion needs to be continued, let's move it to more appropriate forum and prevent cluttering this thread, which is more about getting the first aid, collecting all the tips&tricks to make Xorg.conf resolution/refresh-rate related settings in Ubuntu. Thank you very much.
    Last edited by heimo; February 20th, 2006 at 07:00 AM.

  2. #42
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    Re: HOWTO: change resolution/refresh rate in Xorg

    I added some Modelines for 1680x1050 and 1440x900 at 60 Hz, and I can at least get those resolutions now. Someone on the HP forums said Linux seems to require 60 Hz for LCD displays, seems silly. Anyhow At both those resolutions I have line of white pixels about 1 pixel high at the bottom of the screen. Is there a tool to adjust the geometry of the displayed image on the physical screen?

  3. #43
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    Re: HOWTO: change resolution/refresh rate in Xorg

    I just made a new install great

  4. #44
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    Re: HOWTO: change resolution/refresh rate in Xorg

    Quote Originally Posted by fangorious
    I added some Modelines for 1680x1050 and 1440x900 at 60 Hz, and I can at least get those resolutions now. Someone on the HP forums said Linux seems to require 60 Hz for LCD displays, seems silly.
    I used to think that too, as I couldn't get my LG L1750S (LCD) to display its full 1280x1024@75 Hz. But I found that the only modeline configurators that worked for me were the http://sh.nu/nvidia/gtf.php and http://zaph.com/Modeline/ . this last one generates a XFree line, but it works as fine as the normal modeline.

    Now my monitor is working right @75 Hz.

    Try for yourself different modeline calculators and see if any of them works.

  5. #45
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    Re: HOWTO: change resolution/refresh rate in Xorg

    Quote Originally Posted by Rellik
    Great tip thanks! Would anyone mind telling me, though, how to stop that secondary X once it's started? Very useful, not having to restart the computer and all could have saved me half an hour at least as I'm working with this xorg stuff
    On that secondary X, press CTRL+ALT+Backspace. That will terminate the X server and return you to the remainder X. Tested.

  6. #46
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    Ubuntu 9.04 Jaunty Jackalope

    Re: HOWTO: change resolution/refresh rate in Xorg

    excellent thread it helped me with my monitor problems, thank you

  7. #47
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    Re: HOWTO: change resolution/refresh rate in Xorg

    A great thread like this is like a gift that keeps on giving. I just got a 24 " Dell 2405FPW and I can at least get 1600x1200 instead of 800x600. Thank you. Thank you. Thank you.
    Something Clever and Witty should go here....
    _____________________________
    Registered Linux User #390345

  8. #48
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    Ubuntu Breezy 5.10

    Re: HOWTO: change resolution/refresh rate in Xorg

    Quote Originally Posted by pbb
    Since this guide seems mostly for beginners, I suggest updating the guide with the remark tseliot made ("Ok, you shouldn't have put that command into the terminal..."). Beginners do make beginnner's mistakes, and this saves them from having to read through the comments.
    As a super-noob, I have a really dumb question. Where (if not in a terminal window) should I enter the following command to close Xorg?

    sudo /etc/init.d/gdm stop

    Thanks!

  9. #49
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    Ubuntu 14.04 Trusty Tahr

    Question Re: HOWTO: change resolution/refresh rate in Xorg

    Im NEW to Linux and i edited my xorg.conf & I was wondering if someone can take a look at it and tell me if i did it correctly. I got the Horizontal Freq & Vertical Freq from my monitor manual, Here's my xorg.conf:


    # /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/X11/fonts/misc"
    FontPath "/usr/share/X11/fonts/cyrillic"
    FontPath "/usr/share/X11/fonts/100dpi/:unscaled"
    FontPath "/usr/share/X11/fonts/75dpi/:unscaled"
    FontPath "/usr/share/X11/fonts/Type1"
    FontPath "/usr/share/X11/fonts/CID"
    FontPath "/usr/share/X11/fonts/100dpi"
    FontPath "/usr/share/X11/fonts/75dpi"
    # paths to defoma fonts
    FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
    FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
    EndSection

    Section "Module"
    Load "GLcore"
    Load "bitmap"
    Load "ddc"
    Load "dri"
    Load "extmod"
    Load "freetype"
    Load "glx"
    Load "int10"
    Load "type1"
    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" "ImPS/2"
    Option "Emulate3Buttons" "true"
    Option "ZAxisMapping" "4 5"
    EndSection

    Section "Device"
    Identifier "NVIDIA Corporation NV40 [GeForce 6800 GT]"
    Driver "nvidia"
    BusID "PCI:1:0:0"
    VideoRam 256
    EndSection

    Section "Monitor"
    Identifier "NEC MultiSync FE992"
    Option "DPMS"
    HorizSync 30-98
    VertRefresh 50-160
    EndSection

    Section "Screen"
    Identifier "Default Screen"
    Device "NVIDIA Corporation NV40 [GeForce 6800 GT]"
    Monitor "NEC MultiSync FE992"
    DefaultDepth 24
    SubSection "Display"
    Depth 1
    Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
    SubSection "Display"
    Depth 4
    Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
    SubSection "Display"
    Depth 8
    Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
    SubSection "Display"
    Depth 15
    Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
    SubSection "Display"
    Depth 16
    Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
    SubSection "Display"
    Depth 24
    Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
    EndSection

    Section "ServerLayout"
    Identifier "Default Layout"
    Screen "Default Screen"
    InputDevice "Generic Keyboard"
    InputDevice "Configured Mouse"
    EndSection

    Section "DRI"
    Mode 0666
    EndSection


    Thankyou in advance.

  10. #50
    Join Date
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    Palo Alto, CA
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    Ubuntu Breezy 5.10

    Re: HOWTO: change resolution/refresh rate in Xorg

    Hey Christopher,

    Before you edited your xorg.conf, did you close Xorg? If so, where did you type sudo /etc/init.d/gdm stop?

    Thanks

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