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-   -   Twinview problems : DVI is great VGA is blurred (again. xorg.conf was truncated.) (http://www.nvnews.net/vbulletin/showthread.php?t=62214)

k_karthus 12-26-05 11:19 AM

Twinview problems : DVI is great VGA is blurred (again. xorg.conf was truncated.)
 
Dear NVidia users,

[Ok. I screwed up my first post to the list (the xorg.conf was truncted) ! Here is the post again.]

I've switched to a Twinview setup on my desktop.
(OpenGL renderer string: GeForce 6800/PCI/SSE2)

I have it hooked to two Dell 2005FPW 20" monitors. The DVI is great, the VGA is blurred. (both run at 1680x1050 resolution).

I use Debian 2.6.12-1-686-smp kernel .
(I wonder if it has anything to do with the modeline values.)

Below is my Xorg.conf if it helps.

Has anybody else had this problem ? I would appreciate any help.

Thank you
-karthik

----------------------------------------------
Section "Files"
FontPath "unix/:7100" # local font server
# if the local font server has problems, we can fall back on these
# FontPath "/usr/lib/X11/fonts/Type1"
# FontPath "/usr/lib/X11/fonts/CID"
# FontPath "/usr/lib/X11/fonts/Speedo"
FontPath "/usr/lib/X11/fonts/misc"
FontPath "/usr/lib/X11/fonts/cyrillic"
FontPath "/usr/lib/X11/fonts/100dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/Type1"
FontPath "/usr/lib/X11/fonts/Speedo"
FontPath "/usr/lib/X11/fonts/100dpi"
FontPath "/usr/lib/X11/fonts/75dpi"
EndSection

Section "Module"
Load "dbe"
Load "type1"
Load "freetype"
Load "glx"
# Load "dri"
Load "GLcore"
Load "bitmap"
Load "ddc"
Load "extmod"
Load "int10"
Load "record"
Load "speedo"
Load "vbe"
Load "v4l"
Load "xtrap"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
Option "XkbOptions" "altwin:meta_win"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/psaux"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
Identifier "Generic Mouse"
Driver "mouse"
Option "SendCoreEvents" "true"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection

Section "Modes"
Identifier "1680x1050"
# 1680x1050 @ 60.00 Hz (GTF) hsync: 65.22 kHz; pclk: 147.14 MHz
Modeline "1680x1050" 147.14 1680 1784 1968 2256 1050 1051 1054 1087 -HSync +Vsync
EndSection

Section "Device"
Identifier "Generic Video Card"
Driver "nvidia"
VendorName "NVidia"
BoardName "NVIDIA GeForce4 (generic)"
Option "DPMS"
Option "TwinView"
Option "SecondMonitorHorizSync" "30-83"
Option "SecondMonitorVertRefresh" "60"
Option "MetaModes" "1680x1050,1680x1050"
Option "TwinViewOrientation" "LeftOf"
Option "RenderAccel" "true"

EndSection

Section "Monitor"
Identifier "Generic Monitor"
VendorName "Dell"
ModelName "2005FP Widescreen"
HorizSync 30.0 - 83.0
VertRefresh 60
Option "DPMS"
# 1680x1050 @ 60.00 Hz (GTF) hsync: 65.22 kHz; pclk: 147.14 MHz
Modeline "1680x1050" 147.14 1680 1784 1968 2256 1050 1051 1054 1087 -HSync +Vsync
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Dell"
ModelName "2005FP Widescreen"
HorizSync 30.0 - 83.0
VertRefresh 60
Option "DPMS"
# 1680x1050 @ 60.00 Hz (GTF) hsync: 65.22 kHz; pclk: 147.14 MHz
Modeline "1680x1050" 147.14 1680 1784 1968 2256 1050 1051 1054 1087 -HSync +Vsync
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "Generic Monitor"
DefaultDepth 24

SubSection "Display"
Depth 1
Modes "1680x1050"
EndSubSection
SubSection "Display"
Depth 4
Modes "1680x1050"
EndSubSection
SubSection "Display"
Depth 8
Modes "1680x1050"
EndSubSection
SubSection "Display"
Depth 15
Modes "1680x1050"
EndSubSection
SubSection "Display"
Depth 16
Modes "1680x1050"
EndSubSection
SubSection "Display"
Depth 24
Modes "1680x1050"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
InputDevice "Generic Mouse"
EndSection

# ************************************************** ********************
# Server flags section.
# ************************************************** ********************

Section "ServerFlags"

# Uncomment this to cause a core dump at the spot where a signal is
# received. This may leave the console in an unusable state, but may
# provide a better stack trace in the core dump to aid in debugging

# Option "NoTrapSignals"

# Uncomment this to disable the <Crtl><Alt><BS> server abort sequence
# This allows clients to receive this key event.

# Option "DontZap"

# Uncomment this to disable the <Crtl><Alt><KP_+>/<KP_-> mode switching
# sequences. This allows clients to receive these key events.

# Option "Dont Zoom"

# Uncomment this to disable tuning with the xvidtune client. With
# it the client can still run and fetch card and monitor attributes,
# but it will not be allowed to change them. If it tries it will
# receive a protocol error.

# Option "DisableVidModeExtension"

# Uncomment this to enable the use of a non-local xvidtune client.

# Option "AllowNonLocalXvidtune"

# Uncomment this to disable dynamically modifying the input device
# (mouse and keyboard) settings.

# Option "DisableModInDev"

# Uncomment this to enable the use of a non-local client to
# change the keyboard or mouse settings (currently only xset).

# Option "AllowNonLocalModInDev"

EndSection

Section "DRI"
Mode 0666
EndSection
----------------------------------------------------------

Xevious 12-27-05 05:54 AM

Re: Twinview problems : DVI is great VGA is blurred (again. xorg.conf was truncated.)
 
maybe try a different VGA cable? all 15-ping VGA cables were not created equally some can push a lot more bandwidth through them than others. or have you tried it on another computer or same comp in windows to see if it is blurry as well?

k_karthus 12-28-05 02:27 PM

Re: Twinview problems : DVI is great VGA is blurred (again. xorg.conf was truncated.)
 
Thanks for replying

Yes I did try switching the cables and the monitors and that isn't the problem . I have a machine that can dual boot on windows and linux and the same machine with the same cables looks on with the monitor that's hooked to the VGA output on windows, but not on Linux.

I have a friend who uses the same monitors, (on Debian) however with a nvidia Graphics card that supports dual DVI and his display is crystal clear.

_john_i_ 12-28-05 05:11 PM

Re: Twinview problems : DVI is great VGA is blurred (again. xorg.conf was truncated.)
 
I have the Dell 2001FP, and if I use VGA instead of DVI it is blurry initially. To fix it, go into the setup menu on the monitor, I think the place you need to do is under the screen menu (Sorry I'm not at home now to tell you the exact place). Under one of the menus is an option to do "autoadjust". Run the autoadjust, and it will shake your screen around a little bit to center it, and it should also take away the blurriness when done. It will not be as sharp as DVI, but should be a big improvement. At least on the 2001FP this is the case. I assume 2005FPW is similar.

p.s. be sure to run the autoadjust after the monitor has your X screen up, or it will save the adjustments for a different screen mode.

k_karthus 12-29-05 09:09 PM

Re: Twinview problems : DVI is great VGA is blurred (again. xorg.conf was truncated.)
 
Thanks to all who replied.

Autoadjust was one of the first things I tried. In fact the monitor was always at the default settings. Nevertheless, I can still see blurred displays on the VGA :(

Maybe its a dell issue.
-karthik

Dr Hotdog 12-30-05 12:40 PM

Re: Twinview problems : DVI is great VGA is blurred (again. xorg.conf was truncated.)
 
Just how blurred is it? You should expect DVI to give a noticeably sharper picture with an LCD monitor than VGA can, especially with a high resolution display, afterall that's the main point of using DVI.

When you've got an LCD hooked up via VGA you have the video card generating digital data, converting it to an analogue signal for sending over the cable, and the monitor converting it back to digital information again. There's inevitably some loss of fidelity in this process, though using a high quality VGA cable will help a little as Xevious mentions. With a DVI connection the signal remains digital throughout and so there is no blurring.

I have a Dell 2405FPW, and at one point I set it up with cloned inputs over VGA and DVI just to be able to switch between the two with the same image on the screen and see how much better DVI was. I was expecting a sharper image when I finally got the hardware to drive this monitor over DVI instead of VGA, and I was very pleased when I saw the difference :)

Basically this isn't a Dell issue, or an NVIDIA issue, it's a technology issue. VGA outputs were designed for CRTs whereas DVI outputs were designed for LCDs, VGA is always going to give a lower quality picture on an LCD.


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