How to make the LCD show 24 bits colors (Part 2)

[Hal V. Engel]

There are some LCM monitors that do not support 8 bits/channel.  This used to 
be very common but is less common in more recent displays.  These devices wil 
accept 8 bit/channel input but will map those colors into the color depth 
that is supported by the display hardware.  Perhaps your display is one of 
these?

On Thursday 02 August 2007 11:44, you wrote:
> Hi,
>
> After making a lot of changes. My monitor is still showing 16 bit
> colors. There's something strange, if I run xwininfo command I get the
> following report:
>
>    Absolute upper-left X:  0
>    Absolute upper-left Y:  49
>    Relative upper-left X:  0
>    Relative upper-left Y:  24
>    Width: 1440
>    Height: 825
>    Depth: 24
>    Visual Class: TrueColor
>    Border width: 0
>    Class: InputOutput
>    Colormap: 0x20 (installed)
>    Bit Gravity State: NorthWestGravity
>    Window Gravity State: NorthWestGravity
>    Backing Store State: NotUseful
>    Save Under State: no
>    Map State: IsViewable
>    Override Redirect State: no
>    Corners:  +0+49  -0+49  -0-26  +0-26
>    -geometry 1440x825+0+25
>
> These are the relevant sections in xorg.conf:
> ...
> Section "Module"
>      Load           "i2c"
>      Load           "bitmap"
>      Load           "ddc"
>      Load           "extmod"
>      Load           "freetype"
>      Load           "int10"
>      Load           "vbe"
>      Load           "glx"
> EndSection
> ...
> Section "Monitor"
>      Identifier     "VA1703wSERIE"
>      HorizSync       24.0 - 70.0
>      VertRefresh     50.0 - 75.0
>      Gamma           0.6
>      ModeLine       "1440x900" 106.5 1440 1520 1672 1904 900 903 909 934
>      Option         "DPMS"
> EndSection
>
> Section "Device"
>      Identifier     "nVidia Corporation NV5M64 [RIVA TNT2 Model 64/Model
> 64 Pro]"
>      Driver         "nvidia"
> EndSection
>
> Section "Screen"
>      Identifier     "Default Screen"
>      Device         "nVidia Corporation NV5M64 [RIVA TNT2 Model 64/Model
> 64 Pro]"
>      Monitor        "VA1703wSERIE"
>      DefaultDepth    24
>      DefaultFbBPP    32
>      Option         "AddARGBGLXVisuals" "True"
>      Option         "NvAGP" "1"
>      Option         "AllowDDCCI" "True"
>      Option         "UseDisplayDevice" "DFP"
>      Option         "IgnoreDisplayDevices" "CRT"
>      Option         "FlatPanelProperties" "Dithering = Enabled"
>      Option         "ModeValidation" "NoDFPNativeResolutionCheck"
>      Option         "DigitalVibrance" "50"
>      Option         "UseEdidFreqs" "False"
>      Option         "NoLogo" "True"
>      Option         "AllowGLXWithComposite" "True"
>      Option         "PseudoColorVisuals" "Off"
>      Option	   "UseFBDev"	"True"
>      SubSection     "Display"
>          Viewport    0 0
>          Depth       16
>          Modes      "1440x900" "1024x768" "800x600" "640x480"
>      EndSubSection
>      SubSection     "Display"
>          Viewport    0 0
>          Depth       24
>          Modes      "1440x900" "1024x768" "800x600" "640x480"
>      EndSubSection
> EndSection
>
> I made a few changes to xorg.conf and attached my old CRT monitor and I
> saw 24 bit colors. I also attached the ViewSonic VA1703wb to an iBook G4
> VGA adaptor and I saw 24 bit colors. I suspect the problem is related to
> the way the TNT2 send information to the LCD monitor.
>
> I'll really appreciate any kind of help.
>
> Thank you in advance.
>
> Luis Pablo
>
>
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