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Re: Xf86 4.1.0.1 configuration problem



Conor McCutcheon <conor@mccutch.com> wrote:

Thank you, that has made my xserver at least find a functioning display.
I still am having some inexplicable difficulties though.  I have a very
poor monitor, only capable of 640x480 at 8bpp (better than a herc mono
though), and I cannot compel X to use that and only that resolution
without it doing something shitty to my screen.  I have in my "Screen"
section of the configuration:
SubSection "Display"
	Modes "640x480"
	Depth  8
EndSubSection
I would think that this is exactly what I would want, but the X server
reports that it finds no display for depth/fbbpp 4/4.  When I set the
depth to 4, it works, but I do not understand why it insists on having
4bpp.  I can force it to go to 8 by using the DefaultDepth option, but
then it sets the resolution to 320x200, and uses half of my screen
instead of the full thing.  I am stuck...


Check out the video card's memory / memory setting. It sounds like X is trying to give you a display that will "fit" within the memory limits of the card.

For 640 X 480 X 8 resolution you will need 2457600 BITS (2.4576 Megs) of video memory.

For 320 X 200 X 8 you need only 512000 (0.512 Megs) of video memory.

As an aside, I find your report that the MONITOR is placing limits on your color depth quite unusual. I have never seen one that does this, except for some of the very old digital monitors circa 1980 time... Most analog monitors only place limits on your resolutions via the synch rates for the vertical and horizontal ranges. Most analog monitors can handle whatever color depth you can throw at them as long as you keep the horizontal and vertical synch signals within range. I wonder what type monitor you have?? (Model #, Make, etc). BTW, I am using the terms "digital" and "analog" here in the sense of how the monitor processes the video signals provided. A "digital" monitor is quite rare..

Video cards, on the other hand ARE limited in color depth by the amount of on-board memory provided, as implied above.

Cheers,
-Don Spoon-







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