External display on I945GM

[Ravak]

I have a MAXDATA laptop with i945GM card:

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00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03)

The laptop has DVI and TV outputs. Since the monitor is analog, I'm using D/A converter - monitor is seen both as VGA and TMDS-1:

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Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1280 x 1280
VGA connected 1024x768+0+0 (normal left inverted right) 0mm x 0mm
   1024x768       60.0* -1
   800x600        60.3  
   640x480        59.9  
LVDS connected (normal left inverted right)
   1280x800       59.9 + -2
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
TMDS-1 connected (normal left inverted right)
   1024x768       60.0  -3
   800x600        60.3  
   640x480        59.9  
TV disconnected (normal left inverted right)

With the config I have, it somehow manages to probe the display - works in modes displayed above. Although:
1. once I change resolution I can't revert back to LVDS
2. at start 1, 2 and 3 resolutions are selected, but only LVDS actually works (external display shows garbage)

I tried experimenting with HorizSync and VertRefresh (these should be correct values for SyncMaster 913N):

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HorizSync    35.156-79.976
VertRefresh  56.25-75.025

And in VGA section I get new screen resolutions yet I can't use them (in TMDS-1 there's still those 3 so I guess it's blocking it). The ones that were working, now stops (goes blank).

Anyway, I'm trying to get Samsung 913N working in 1280x1024 resolution, so far with no success. And here's my xorg.conf:

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Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen         0 "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	RgbPath      "/usr/share/X11/rgb"
	ModulePath   "/usr/lib64/xorg/modules"
	FontPath     "/usr/share/fonts/misc/"
	FontPath     "/usr/share/fonts/TTF/"
	FontPath     "/usr/share/fonts/OTF"
	FontPath     "/usr/share/fonts/Type1/"
	FontPath     "/usr/share/fonts/100dpi/"
	FontPath     "/usr/share/fonts/75dpi/"
EndSection

Section "Module"
	Load  "xtrap"
	Load  "dri"
	Load  "GLcore"
	Load  "record"
	Load  "glx"
	Load  "extmod"
	Load  "dbe"
	Load  "freetype"
	Load  "type1"
EndSection

Section "dri"
  Mode 0666
EndSection

Section "Extensions"
    Option "Composite" "Enable"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option      "XkbRules"  "xorg"
	Option      "XkbLayout" "pl"
	Option 	    "XkbModel"  "pc105"
EndSection

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

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "SAMSUNG"
	ModelName    "SyncMaster 913N"
	#HorizSync    35.156-79.976
	#VertRefresh  56.25-75.025
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     "NoAccel"            	# [<bool>]
        #Option     "SWcursor"           	# [<bool>]
        #Option     "ColorKey"           	# <i>
        #Option     "CacheLines"         	# <i>
        #Option     "Dac6Bit"            	# [<bool>]
        #Option     "DRI"                	# [<bool>]
        #Option     "NoDDC"              	# [<bool>]
        #Option     "ShowCache"          	# [<bool>]
        #Option     "XvMCSurfaces"       	# <i>
        #Option     "PageFlip"           	# [<bool>]
	Identifier  "Card0"
	Driver      "i810"
	VendorName  "Intel Corporation"
	BoardName   "Mobile 945GM/GMS/940GML Express Integrated Graphics Controller"
	BusID       "PCI:0:2:0"
EndSection

Section "Screen"
	Identifier   "Screen0"
	Device       "Card0"
	Monitor      "Monitor0"
	DefaultDepth 24
	SubSection "Display"
		Depth     24
		Modes     "1280x1024" "1152x864" "1024x768" "800x600" "640x400"
	EndSubSection
	SubSection "Display"
		Depth     16
		Modes     "1280x1024" "1152x864" "1024x768" "800x600" "640x400"
	EndSubsection
EndSection

Thanks for any help.