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

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    Ubuntu 12.04 Precise Pangolin

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

    Hi.
    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 https://wiki.ubuntu.com/HardwareSupp...sVideoCardsAti
    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 wiki.cchtml.com
    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 http://paste.ubuntu.com/87354/
    Output of lshw is at http://paste.ubuntu.com/87356/
    cat xorg.conf output is at http://paste.ubuntu.com/87360/
    Last edited by hanzj; December 17th, 2008 at 11:46 PM.

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