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Thread: dual monitor Screen Resolutions reverts to mirrored after reboot/logging-out

  1. #1
    Join Date
    May 2005
    At home
    Ubuntu 12.04 Precise Pangolin

    Question dual monitor Screen Resolutions reverts to mirrored after reboot/logging-out

    Am using Ubuntu 8.10.

    I have a video card that accepts 2 monitors. So I want to have a dual monitor setup, wherein, side-by-side, they act as one extra wide monitor.

    My two CRT monitors are NEC MultiSync FP2141SB and AOC 9KLR.

    My video card:
    ~$ lspci | grep -i vga
    05:00.0 VGA compatible controller: ATI Technologies Inc R480 [Radeon X850XT Platinum (PCIE)]
    According to the Net, my NEC MultiSync FP2141SB supports up to 2,048 x 1,536 resolution at 85 Hz.

    But in the "Monitor Resultion Settings" window, the max that the NEC monitor goes up to is 1680 x 1050 (16:10).

    So, In System > Preferences > Screen Resolution,
    I remove the check box that is on "Mirrored Screens".

    I then choose the ff:
    AOC Intl 18": 1280 x 960 (4:3) at 60 Hz refresh
    NEC 20": 1400 x 1050 (4:3) at 85 Hz refresh.
    I then hit the Apply button. Sometimes, it works, just right.
    But other times, I get a mirrored effect, with both monitors displaying the "AOC Intl 18" box on the upper left of each screen after I hit Apply and before clicking the Close button.
    I don't know why it sometimes works and sometimes doesn't.

    Also, even thought it's now working just fine now, after I reboot or log-out, the resolutions revert back to mirrored screens.

    I don't know what's going on.

    I have _not_ turned on hardware acceleration. I have not touched System > Administration > Hardware Drivers. In other words, I have NOT turned on ATI/AMD proprietary FGLRX graphics driver.

    According to
    Make : ATI
    Model Radeon X850 XT
    Chipset/Driver [blank]
    Auto-detected? Yes
    2D Yes
    3D Yes
    Ubuntu Version Edgy & Dapper
    Comments if X server does not start with driver "Ati" (first boot) change it to "vesa" and then follow the instructions on
    Last Updated [blank]
    Below are outputs of what may be helpful info. If you need to know some more, please let me know.

    To see the output of dmesg, pls see
    Output of lshw is at
    cat xorg.conf output is at
    Last edited by hanzj; December 17th, 2008 at 11:46 PM.

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