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Thread: Ubuntu on Dual-Monitor Desktop detects single laptop screen

  1. #1
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    Ubuntu on Dual-Monitor Desktop detects single laptop screen

    I have a custom built gaming computer with 2 monitors, after using Ubuntu on my laptop since 8.04 on up to 12.04 I decided to install the same 12.04 on my desktop which usually runs Windows.

    The main problem I'm having now is it only detects 1 monitor and treats it like a laptop monitor. I read in other places this is usually dismissed by the community as a "silly" bug and should be fixed sometime soon as I guess most people have just one monitor anyways.

    During installation it detected the 2nd monitor just fine and duplicated my screen onto it but after installation it remained unused. At one point I did use synaptic to export a list of all the installed packages on my laptop to my Desktop for download so I don't know if that fiddled with anything or not.

    I use the 2nd monitor pretty often for a lot of different stuff. Is there anyway to fix this, if theres no way to fix it now and I have to wait until some unspecified time in the future for it to be fixed then I need to stop setting up Ubuntu and re-install Windows.

    Also, is this Ubuntu specific, I have other Desktops installed so would Kubuntu or some other one be able to detect the 2nd monitor?
    I speak English, ちょっと日本語を話します

  2. #2
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    To see if we can fix it with a quick command, run

    Code:
    xrandr
    with both screens connected, and post output.

  3. #3
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    The output is below

    Code:
    xrandr: Failed to get size of gamma for output default
    Screen 0: minimum 320 x 175, current 1920 x 1080, maximum 1920 x 1080
    default connected 1920x1080+0+0 0mm x 0mm
       1920x1080      50.0     51.0* 
       1680x1050      52.0     53.0  
       1600x1024      54.0  
       1440x900       55.0  
       1400x1050      56.0     57.0     58.0  
       1360x768       59.0     60.0  
       1280x1024      61.0     62.0     63.0  
       1280x960       64.0     65.0  
       1152x864       66.0     67.0     68.0     69.0     70.0     71.0     72.0  
       1024x768       73.0     74.0     75.0     76.0     77.0     78.0  
       960x720        79.0     80.0  
       960x600        81.0  
       960x540        82.0  
       928x696        83.0     84.0  
       896x672        85.0     86.0  
       840x525        87.0     88.0     89.0     90.0     91.0  
       832x624        92.0  
       800x600        93.0     94.0     95.0     96.0     97.0     98.0     99.0    100.0    101.0    102.0  
       800x512       103.0  
       720x450       104.0  
       720x400       105.0  
       700x525       106.0    107.0    108.0    109.0  
       680x384       110.0    111.0  
       640x512       112.0    113.0    114.0  
       640x480       115.0    116.0    117.0    118.0    119.0    120.0    121.0    122.0  
       640x400       123.0  
       640x350       124.0  
       576x432       125.0    126.0    127.0    128.0    129.0    130.0    131.0  
       512x384       132.0    133.0    134.0    135.0    136.0  
       416x312       137.0  
       400x300       138.0    139.0    140.0    141.0    142.0  
       360x200       143.0  
       320x240       144.0    145.0    146.0    147.0  
       320x200       148.0  
       320x175       149.0
    I speak English, ちょっと日本語を話します

  4. #4
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    Hm, what about

    Code:
    lspci | grep -i vga
    lshw -C video
    Please post output.

    Oh, and I doubt Kubuntu would do a better job of detecting- sounds like drivers to me.

  5. #5
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    Following output below

    lspci | grep -i vga
    Code:
    01:00.0 VGA compatible controller: NVIDIA Corporation GT200 [GeForce GTX 260] (rev a1)
    lshw -C video
    Code:
    *-display               
           description: VGA compatible controller
           product: GT200 [GeForce GTX 260]
           vendor: NVIDIA Corporation
           physical id: 0
           bus info: pci@0000:01:00.0
           version: a1
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
           configuration: driver=nvidia latency=0
           resources: irq:16 memory:cc000000-ccffffff memory:b0000000-bfffffff memory:ca000000-cbffffff ioport:8c00(size=128) memory:cd000000-cd07ffff
    I speak English, ちょっと日本語を話します

  6. #6
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    In about 3 hours I'm going to switch to the NVIDIA post release update proprietary driver, perhaps that may reset whatever is convincing Ubuntu it's handling a laptop screen.

    Would anything else come into factor for this problem, such as some of the packages that carried over from my laptop or something to do with the linux kernel. Maye a configuration file. Or just *buntu. If it's *buntu then it's not fixable and I needn't configure ubuntu any further, but I don't want to come to that conclusion just right away mainly because I dislike Windows and the week-long setup process it puts me through rather than the few hours with Ubuntu.
    I speak English, ちょっと日本語を話します

  7. #7
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    I can't conceive the package transfer affecting this in any way.
    I'm pretty sure the Nvidia driver will fix it for you. This is a very common issue.

  8. #8
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    The driver update didnt work. Same issue.
    I speak English, ちょっと日本語を話します

  9. #9
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    You tried running

    Code:
    sudo apt-get update
    sudo apt-get install nvidia-current nvidia-settings
    sudo nvidia-xconfig
    And a reboot?

  10. #10
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    Re: Ubuntu on Dual-Monitor Desktop detects single laptop screen

    That worked,

    In case anyone else has this problem and can't get it resolved, here is what worked for me.

    run from the terminal or console,
    Code:
    sudo nvidia-settings
    This launches the special app for controlling your nvidia card, apparently Ubuntu can't control it probably due to proprietary drivers and firmware so Ubuntu thinks it's a laptop screen. This happens even if the correct drivers are installed so all configuration must go through this tool.

    I think you can select it from the launcher / other menu but I tend to mainly use the terminal. Either way the program won't pop-up automatically.

    The tool is a bit complicated at first but you must click the button "Save to X File" before closing the app or all changes are temporary.

    Thanks cortman
    I speak English, ちょっと日本語を話します

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