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Re: XF 4.x config (was RE: [PLUG] how do you change resolutionsetting after the install)
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LeRoy Cressy wrote:
>
> There are some things that you just have to do by hand. Most of the
> configurators do not handle high end monitors very well.
>
> Using your favorite text editor hand edit your XF86Config file.
>
> The important items in this are: DefaultColorDepth 32
>
> which automatically sets the color depth to 32 BPP instead of having the
> system default to 8 BPP
>
> Or this is like runing
> startx -- -bpp 32
>
A little caution here. We've deprecated the -bpp option in 4.0x
versions because of confusion between color depth and bits-per-pixel.
If you use -bpp you'll get a warning or error in XFree86 4.0x. Use
-depth instead. Also, must drivers don't support depth 32 (or
DefaultColorDepth 32), because most PC graphics hardware doesn't really
support a color depth of 32 planes (I forget the exact term here. The
important point is that past usage of -bpp 32 was incorrect for most
cases because graphics cards usually store 24 bits of color information
in a 32 bit word. And don't support more than 24 bits of color
information.)
Again, I only speaking about XFree86 4.0 and 4.0.1 or later.
> The following subsections specify the resolutions beginning with the
> first one as the default. With X you can switch resolutions on the fly
> with <CTRL><ALT><Keypad +> This will recycle you through the various
> resolutions in your screen section.
>
> The first resolution is the default. Also, you might want to make your
> own modelines for your monitor. For instance, I've found that some of
> the ``standard'' modes are not good, and normally they don't include the
> high end graphics mode 1600x1200.
>
> I have also found that sometimes there are resolutions that you don't
> want or desire so I take them out using only the resolutions that you
> want.
>
> Another important thing to note is not all applications will run at 32
> BPP. They will all run at 8 BPP though this color depth only has 256
> colors.
>
Very true. I've found depth 16 a good compromise for most of my uses.
There are generally speed differences also. Depth 8 is usually fastest,
depth 16 slower and depth 24 slowest. These are the most common
depths. They relate to Windows driver numbers you may have seen like
this:
Depth Colors
8 256 - SVGA, ...
16 16K - Hi-color, ...
24 32M - Truecolor
> Section "Screen"
> Driver "Accel"
> Device "ATI XPERT 128 AGP"
> Monitor "GS790"
> DefaultColorDepth 32
> BlankTime 0
> SuspendTime 0
> OffTime 0
> SubSection "Display"
> Depth 8
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> SubSection "Display"
> Depth 15
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> SubSection "Display"
> Depth 16
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> SubSection "Display"
> Depth 24
> Modes "1600x1200" "1280x1024" "1024x768"
> : EndSubSection
> SubSection "Display"
> Depth 32
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> EndSection
>
> Section "Screen"
> Driver "SVGA"
> Device "ATI XPERT 128 AGP"
> Monitor "GS790"
> DefaultColorDepth 32
> BlankTime 0
> SuspendTime 0
> OffTime 0
> SubSection "Display"
> Depth 8
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> SubSection "Display"
> Depth 15
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> SubSection "Display"
> Depth 16
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> SubSection "Display"
> Depth 24
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> SubSection "Display"
> Depth 32
> Modes "1600x1200" "1280x1024" "1024x768"
> EndSubSection
> EndSection
>
> Jeff Dean wrote:
> >
> > Since my original post, I've installed XFree86 v4.0.1 on a RH6.0 box.
> > After the installation, you're instructed by Xinstall.sh to run
> >
> > XFree86 -configure
> >
> > to generate an initial config file. This worked as far as detecting mouse
> > and graphics card and yielded a basic working XF86Config. However, it
> > didn't handle the mode issues to increase resolution.
> >
>
> --
> Rev. LeRoy D. Cressy mailto:ldc@netaxs.com /\_/\
> http://www.netaxs.com/~ldc ( o.o )
> Phone: 215-535-4037 > ^ <
>
> Jesus saith unto him, I am the way, the truth, and the life:
> no man cometh unto the Father, but by me. (John 14:6)
>
--
Kevin Brosius
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