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I have been installing (Red Hat) Linux on an IBM NetVista X40. This is a fairly new, compact system, with the motherboard and hard drive mounted directly behind the LCD display. So there is no monitor type as such.
I am a complete beginner with Linux, but I have a text-based system up and running. However, I have been unable to configure X. The configurator recognises my (SiS) video card, but not the display. So I have to use the generic display description, which requires me to know the "vertical and horizontal syncs". I believe the vertical sync is the refresh rate - 60 Hz, but I don't know the horizontal sync; IBM technical support don't, and nor do my technical contacts in IBM development. I am trying SiS, who I think produce the display, but without much hope (they are in Taiwan, and don't think users are their problem !)
Red Hat give ambivalent advice. On one hand, they warn me not to guess the syncs, because that could damage the display. On the other, they suggest "trial and error" !
Can someone tell me any of the following :
1. What is the real risk of trial and error ? Is it any different for an LCD display than for a CRT ?
2. What are probable values for the horizontal sync for a 15in LCD ?
3. Is there any other way I can find out what it might be ?
4. Any other way round ?
Any help much appreciated.