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Thread: Blank screen after starting X11

  1. #1
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    Blank screen after starting X11

    I am struggling to run knoppix on a machine that is my main linux box.

    Its starts fine, goes as far as entering run level 5, then I see starting X11, then the screen goes blank and after a while the monitor goes on standby.

    The CD and hard drive keep working so I guess its a video card / monitor issue.

    The videocard is an onboard ATI 3D rage pro and the monitor a Mag 1595

    This occurs with both knoppix 3.3 and knoppix 3.4-ct

    I have installed RH 9 and SUSE 9 Pro on this machine before without a problem

    I've looked in the FAQs and tried running as VGA=VESA and the other one recommended ( this is from memory so I could have got it the wrong way around)

    Can any one point me in the right direction?


    thanks a mil

    :P

  2. #2
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    Try typing inknoppix xvrefresh=60 xmodule=ati screen=1024x768 at the boot screen then enter. You probably only need the xvrefresh=60 cheat code in the line and you can use a lower screen value if you want.

  3. #3
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    Stephen you are a star

    the xvrefresh=60 did the trick

    what was going wrong with the normal boot? and how did you pick that up?

    thanks a mil


  4. #4
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    Quote Originally Posted by DinB
    Stephen you are a star

    the xvrefresh=60 did the trick

    what was going wrong with the normal boot? and how did you pick that up?

    thanks a mil

    It is older hardware that monitor will not do the 72 hz refresh rate (IIRC) at 1024x768 that knoppix tries to use when it starts X. I have an old Acer here that was made around the same time as yours the best I can get it to use is 67 hz.

  5. #5
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    ok that explains it, intersting it was not an issue with RH or SUSE, but now I know

    thanks again stephen

  6. #6
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    Quote Originally Posted by DinB


    ok that explains it, intersting it was not an issue with RH or SUSE, but now I know

    thanks again stephen
    Never happened to me with Mandrake either, I have the same ATI card in that machine only Knoppix has a problem with the monitor if I put a more recent model of monitor there it works fine. Strangely enough Knoppix will do 1152x768/60hz on that monitor but no other distro will so go figure eh!

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