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Old 08-02-03, 03:12 PM   #1
XPediTioN
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Default 32 Bit

I want to know why I can't use 32 Bit resolution on Linux. I can use 32 Bit in Windows XP with my NVidia Vanta Video Adapter but I can't in Linux, I have the driver installed (4496) and I would like to know some tweaks to make my resolution better ( modules or something that improves it). I have a Compaq FS7550 Color Monitor and a Pentium IV with 512 MB.
I also want to know which is the best refresh rate so that I get the best resolution and true tyoe fonts.
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Old 08-02-03, 07:09 PM   #2
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maybe update your monitors refresh ranges?
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Old 08-03-03, 03:04 AM   #3
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AFAIK there's no 32bit in linux, 24bit is the maximum color depth u can get in linux.
If i'm not wrong, 32bit is just 24bit + "alpha blending or somehing" i forget the exact one...
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Old 08-03-03, 08:06 AM   #4
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correct!

I thought that he had talked about that mode.

you have:

- 8bit colors
- 15bit colors => 16bit = ARGB (A=1bit)
- 16bit colors => 16bit = RGB
- 24bit colors => 32bit = ARGB (A=8bit)

the first one is the color bits the second one is the actual bits used
they are filled up with alpha values, mostly used for blending purposes...

these are the 4 depths:

the 24bit color mode as used in windows is not supported by NVIDIA.

Coorect me if I'm wrong, nobody's perfect
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Old 08-03-03, 05:38 PM   #5
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Actually, in the framebuffer, alpha has no meaning. The remaining 8 bits are not part of the pixel display properties at all. It is there for address alignment so that all pixels in the framebuffer are dword aligned. This improves the performance of pixel read-write operations.

2nd, 32-bpp modes are available (and to the best of my knowledge work on the tnt2 vanta cards as well) on XFree86. If your configuration tool does not allow you to select 32-bpp, then you might need to edit your XF86Config file by hand (sorry). All you have to do is go to Section "SCREEN" -> Subsection "Display" and either make a new Display subsection that has Depth value of 32, or (if you are adventurous) change the value that is there to 32. You will also need to either change the DefaultColorDepth value to 32 or start your X server with startx -- -depth 32.

g-luck
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Old 05-12-04, 01:40 PM   #6
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Default Re: 32 Bit

In your /etc/X11/XF86Config file, in your Screen section, you should set DefaultDepth "24" to use 24-bit color and also DefaultFbbpp "32" to use 32 bits per pixel. This may not actually be necessary since the /var/log/Xfree.0.log file shows that it still uses fbbpp 32 as the default without the DefaultFbpp.
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Old 05-12-04, 01:59 PM   #7
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Default Re: 32 Bit

Quote:
Originally Posted by peberlein
In your /etc/X11/XF86Config file, in your Screen section, you should set DefaultDepth "24" to use 24-bit color and also DefaultFbbpp "32" to use 32 bits per pixel. This may not actually be necessary since the /var/log/Xfree.0.log file shows that it still uses fbbpp 32 as the default without the DefaultFbpp.
Correct... That (no surprise) isn't the case for all drivers though...
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Old 05-12-04, 02:18 PM   #8
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Default Re: 32 Bit

24bit is good enough, 16.7million colours is good for any desktop.
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