[LUG] Linux visual classes

[Kate Evans-Jones - RSG <klev at pml.ac.uk>]

Hi All,

My first posting and a request for help!

How do I convince Linux that it can support 8 bit Pseudocolor AND 24 bit
Truecolor at the same time? I wish to use 24 bit depth as default as I
have a very nice monitor but software I am using (an IDL program) needs
8 bit depth. I have edited the XF86Config file to add another "Display"
Subsection to the Screen Section but it defaults to 8 bit unless I tell
it otherwise and then doesn't provide the other depth options, (checked
using xdpyinfo). 

The Screen Section of XF86Config looks like:

Section "Screen"
    Indentifier "Screen1"
    Device   "nVidia Corporation|NV15 (Geforce2 GTS)"
    Monitor  "My Monitor"
    DefaultDepth  24
    Subsection "Display"
    	Depth  8
	Modes  "1028x768" "800x600"
    EndSubSection
    Subsection "Display"
    	Depth  24
	Modes  "1028x768" "800x600"
    EndSubSection
EndSection

And the output of xdpyinfo gives number of visuals:    9
  default visual id:  0x21
  visual:
    visual id:    0x21
    class:    TrueColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x22
    class:    DirectColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits
....

All using 24 planes, no options for 8 bit depth.

This works on our UNIX Suns why not the Linux PC? Thankyou 

Kate
-- 

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Kate Evans-Jones, Remote Sensing Group  Ph,Fx: +44 (0)1752 633485,633101
Plymouth Marine Laboratory,             E-mail: klev at pml.ac.uk 
Prospect Place, Plymouth PL1 3DH, UK    Web site: www.npm.ac.uk/rsdas/
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