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Reu 07-20-2004 10:15 PM

Display Mode Not Supported Error After Plugging In New Monitor
Greetings to all,

So this morning I recieved my new LCD monitor...

Plugged in my new LCD monitor to my Red Hat Linux box..

Turn on the machine..

Greeted by the regular OS loader and the interactive startup mode..

Finally it's up and I should see the desktop(KDE) login screen..

..but the screen went black with a "Diplay Mode Not Supported" box floating around..

My guess is because the old monitor's refresh rate/resolution/monitor info... is still being loaded therefore those do not work with my LCD monitor..

Is there a way which I can remedy this little problem I have?

BajaNick 07-20-2004 10:29 PM

You probably have to modify your XF86Config file but I dont know what you would modify in it. Maybe go through it and find a line that has LCD in it or something, try a google for LCD displays and Linux.

transke 07-21-2004 03:27 AM

Hi there

I am also having a problem with my LCD screen, but mine is that I cannot change the resolution and it is stuck on 640x480. If you managed to fix your problem please post a message, maybe it will work on my monitor as well...


Frustin 07-21-2004 05:00 AM

both of you post your /etc/X11/XF86Config-4 files on here.

transke 07-21-2004 01:22 PM

I do not know what information that could be useful so I just send all o fthe ciontent of the xorg.conf file:

# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"

Section "Files"

# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7100"

Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
Load "dri"

Section "InputDevice"

# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option "Xleds" "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# or:
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:swapcaps"
# Or if you just want both to be control, use:
# Option "XkbOptions" "ctrl:nocaps"
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbModel" "pc105"
Option "XkbLayout" "no"

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "LCD Panel 1280x1024"
DisplaySize 340 280
HorizSync 31.5 - 80.0
VertRefresh 56.0 - 75.1
Option "dpms"

Section "Device"
Identifier "Videocard0"
Driver "radeon"
VendorName "Videocard vendor"
BoardName "ATI Radeon 7000"

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1280x960" "1024x768" "800x600" "640x480"

Section "DRI"
Group 0
Mode 0666

Thank you for helping...

I just tried my neighbours CRT monitor it was working fine. Seems like the problems is with my LCD monitor and linux. Anybody heard of similar problems? Maybe it is because I use it in analog mode? It seems like linux does not find my LCD monitor...


Frustin 07-22-2004 02:46 AM

where did you get this settings?

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "LCD Panel 1280x1024"
DisplaySize 340 280
HorizSync 31.5 - 80.0
VertRefresh 56.0 - 75.1
Option "dpms"

type at the command line:

Xfree86 -xf86config /root/

open the newly created /root/XF86Config-4

then take the settings that were created in there.

transke 07-22-2004 09:28 AM


Everything in the settings is when I choose a generic LCD panel with the given resolution. The horSync and VertRefresh rates I got from Eizo. com. The setting is for analog mode for the L550.

When I type

Xfree86 -xf86config /root/

in the command line it does not recognize the command.

When I press the INFO-button in the screen it says something like "input 640x480" and this do not change, No matter what I change in the XF86Config-4 file.

I have Linux Mandrake 10.0

Sorry for using someone elses thread for my question but maybe we could help each other, it may be the same problem.


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