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Thread: Projector and Laptop monitor with xrandr

  1. #1
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    Projector and Laptop monitor with xrandr

    Hi,
    I have Debian stable on a laptop and all I want to do is to have a clone on a projector. I have succeeded to do this on any other CRT monitor, but I can't do this with the projector.

    The output of the xrandr -q gives the VGA1 connected. So, its not hardware's problem.

    Any ideas?

    Thx in advance!

  2. #2
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    Re: Projector and Laptop monitor with xrandr

    What exactly does "xrandr -q" say?

    I suspect it's actually is a hardware problem. Projectors are notorious for giving wrong EDID info or no info at all. Sometimes, there is a VGA hardware switch in between the laptop and projector that is causing trouble.

  3. #3
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    Re: Projector and Laptop monitor with xrandr

    The xrandr -q say that the VGA1 device is connected. I cannot post the exact output, because the projector is in work.

    But I don't think its a hardware issue, because in windows the projector works fine.

  4. #4
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    Re: Projector and Laptop monitor with xrandr

    Quote Originally Posted by bo01 View Post
    The xrandr -q say that the VGA1 device is connected. I cannot post the exact output, because the projector is in work.
    I am sure "xrandr -q" says more than that; for instance, it should also say what resolutions are supported. That would help for the next command, e.g. "xrandr --output VGA1 --mode 1024x768"

    But I don't think its a hardware issue, because in windows the projector works fine.
    Unfortunately, Xorg is more fussy about auto-detection. Windows usually do a better job handling unusual situation. That my personal experience/opinion.

  5. #5
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    Re: Projector and Laptop monitor with xrandr

    Yes, it gives the resolution supported and then I run the command with the --mode argument, but nothing happens. And no error message too.

    Anything else???

  6. #6
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    Re: Projector and Laptop monitor with xrandr

    What graphics hardware do you have?

    I re-read your first post, you mentioned you have Debian stable? I'm not sure if my experience with Ubuntu will fully apply.

    EDIT:
    Instead of xrandr on-the-fly configuration, you might have to revert back to manual xorg.conf editing for this to work.
    Last edited by chewearn; February 6th, 2010 at 03:43 PM.

  7. #7
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    Re: Projector and Laptop monitor with xrandr

    I have an Nvidia one. The configuration file are almost the same between Debian-Ubuntu. I don't know what to add in the xorg.conf.

    The strange thing is that, as I mentioned, with any other CRT monitor the xrandr work fine.

  8. #8
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    Re: Projector and Laptop monitor with xrandr

    Are you running proprietary nvidia driver, or open source "nv"? If it's proprietary, the proper way to set this up is using nvidia-settings.

    Code:
    nvidia-settings
    Or (if you need to write to xorg.conf)
    Code:
    gksudo nvidia-settings

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