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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?


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Old 07-11-2003, 03:41 AM   #1
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Registered: Jun 2003
Location: London/Sevenoaks, England
Distribution: Fedora, mostly
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Roving horizontal lines

Dear All,
I am using a pretty old monitor, which I have managed to get to work at a res. of 800x600, but I had severe problems trying to get it up to the standard 1024x768.

I discovered that my monitor did not fit the standard VESA modes set by XFree86, so I had to put in the refresh rates manually.

When I managed to find these out from the manufacturer and key them into the Monitor control panel, I found that my monitor has the 'roving horizontal lines' problem, as set out in the man page for XFree86Config (about halfway down, under the 'monitor' section).

I read that the fix for this is to manually specify a 'modeline' in /etc/X11/XF86Config, adjusting manually one of the values therein - the only problem was that when I did so, following the example given me by a previous log given by the X server, it gave me an error.

It told me that the 'virtual height' of the monitor was set to 0, when the minimum required by the monitor was '128'. I don't understand what this 'virtual height' is, and especially how on earth my setting this 'modeline' - which was all to do with horizontal and vertical refresh rates and 'dot clocks' and 'sync starts' (none of which I can either understand or find explanation for anywhere on the internet or amongst the XFree86 man pages or website) - had anything to do with it.

My distro is RHL 9 (Shrike) pretty much out of the box, if that is any help. I can't get my hands on the X server log right now, but I will happily produce it in all its 'glory' if it could be useful in solving this problem.


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