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Old 09-22-2012, 09:45 PM   #1
jwsvandr
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New Monitor not recognized


I have just bought a used Dell Ultra Sharp Monitor. I am using Ubuntu 12.04. My video card is a NVIDA Corporation C51G [GEForce 6100] (rev a2).

When I start the computer up it doesnt seem to recognize the monitor. I get everything right up to where you select which version of Ubuntu to boot with the purple screen. After that the screen turns black and stays that way.

I have checked the web but no one has posted this problem. The monitor works. I connected it to my Windows laptop and everything seemed fine. I booted with my old monitor and then changed the vga cable to the Dell. It displayed everything ok but at the old monitor's resolution. When I checked for the resolution in Terminal it showed the information from the old monitor.

What can I do????
 
Old 09-23-2012, 05:36 AM   #2
pierre2
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Quote:
After that the screen turns black and stays that way.
that sounds more like the video card is not coping . . .

try a lower screen resolution
 
Old 09-23-2012, 05:55 AM   #3
cascade9
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I'd guess that its a EDID problem. But it could be also a max resolution prolem.

IIRC most of them are 1920x1200 resolution, or higher. 6100s have a max resolution of 1920x1440 with VGA and 1600x1200 with DVI-D. So it migth not work with DVI-D at native resolution, and if you have one of the bigger ultrasharps (eg U2711), you might not be able to get navite resolution even with VGA.

Which model dell ultrasharp are you trying to use?
 
Old 09-23-2012, 07:10 AM   #4
RockDoctor
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My guess is also an EDID problem. I've got a Soyo monitor that doesn't produce a valid EDID; it gives me the black screen by default so I just feed it the following custom /etc/X11/xorg.conf file, and it's happy:
Code:
Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	ModulePath   "/usr/lib/xorg/modules"
	FontPath     "catalogue:/etc/X11/fontpath.d"
	FontPath     "built-ins"
EndSection

Section "Module"
	Load  "dri2"
	Load  "dbe"
	Load  "glx"
	Load  "extmod"
	Load  "record"
	Load  "dri"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"us"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/input/mice"
	Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"

	#UseModes     "Modes0" #monitor0usemodes
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "Monitor Model"
	DisplaySize  432	270
	HorizSync    30.0 - 86.0
	VertRefresh  56.0 - 76.0
	ModeLine     "1440x900" 106.5 1440 1520 1672 1904 900 901 904 932 -hsync +vsync
	ModeLine     "1680x1050" 147.1 1680 1784 1968 2256 1050 1051 1054 1087 -hsync +vsync
	Modeline     "1920x1080"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync
	Option	    "PreferredMode" "1680x1050"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "SWcursor"           	# [<bool>]
        #Option     "HWcursor"           	# [<bool>]
        #Option     "NoAccel"            	# [<bool>]
        #Option     "ShadowFB"           	# [<bool>]
        #Option     "VideoKey"           	# <i>
        #Option     "EXAPixmaps"         	# [<bool>]
        Option 	    "IgnoreEDID"  "TRUE"
	Identifier  "Card0"
	Driver      "nouveau"
	VendorName  "nVidia Corporation"
	BoardName   "Unknown Board"
	BusID       "PCI:2:0:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	SubSection "Display"
		Viewport   0 0
		Depth     24
        Option "IgnoreEDID" "TRUE"
		Modes    "1920x1080" "1680x1050" "1440x900" "1280x1024"
		#Modes    "1680x1050" "1440x900" "1280x1024"
	EndSubSection
EndSection

Section "Extensions"
	Option	    "Composite" "Enable"
	Option	    "Compositing" "Enable"
EndSection
 
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Old 09-23-2012, 07:40 AM   #5
jwsvandr
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Quote:
Originally Posted by cascade9 View Post
I'd guess that its a EDID problem. But it could be also a max resolution prolem.

IIRC most of them are 1920x1200 resolution, or higher. 6100s have a max resolution of 1920x1440 with VGA and 1600x1200 with DVI-D. So it migth not work with DVI-D at native resolution, and if you have one of the bigger ultrasharps (eg U2711), you might not be able to get navite resolution even with VGA.

Which model dell ultrasharp are you trying to use?
model 1704fpt
 
Old 09-23-2012, 08:01 AM   #6
cascade9
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Quote:
Originally Posted by jwsvandr View Post
model 1704fpt

1280x1024 so it shouldnt be a resolution limit. IMO its EDID. Probably the easiest way out is to make custom xorg.conf like RockDoctor.
 
Old 09-23-2012, 10:14 PM   #7
jwsvandr
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Thanks for help

Thank you everyone for your input it has given me a place to start. I will do some more research and see what I can do
 
1 members found this post helpful.
Old 11-25-2013, 05:34 PM   #8
Berwhale
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Unhappy Same prob with Dell U2713HM

Hi All,

I'm having a similar problem with a new Dell U2713HM (while my U2311 is fine). It is not recognized by Fedora 19, Ubuntu 13.10, and Linux Mint 15 Cinnamon (all 64 Bit live OSs) and only displays max resolution of 1024x768. I'm setting up a dual boot with Win7 64 Bit with AMD Radeon HD 7900 Series. The U2713HM displays full 2560x1440 resolution in Windows 7.

My monitors are configured U2311HM Left Rotated Clockwise 90deg AND U2713HM Right Normal.

Would it be sufficient to add ignore EDID and Modes "2560x1440" - to the xorg.conf? As such in the custom xorg.conf below. I'm a tad unsure about sections "Monitor" and "Screen". That xorg.conf is for one monitor alone yes?

It might be all too hard. Dunno.
 
Old 11-26-2013, 06:52 AM   #9
RockDoctor
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My xorg.conf file is for a single monitor - there's no way I can even fit two monitors on my desk. You'll probably need a modeline in the appropriate Monitor section also; gtf is your friend.
 
  


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