getting dual screen to work with Dell workstation running Ubuntu 8.04

CharlieBucket · 05-06-2008, 05:36 AM

Hi,

I have a Dell workstation which I have just installed Ubuntu 8.04 on
with two LCD screens.

lspci gives the following:

Code:

00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)
00:02.1 Display controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 01)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1e.2 Multimedia audio controller: Intel Corporation 82801G (ICH7 Family) AC'97 Audio Controller (rev 01)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)
00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) SATA IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01)
01:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express (rev 01)

Running xrandr gives:

Code:

Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 1600 x 1600
VGA connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024      60.0*+   75.0     59.9  
   1152x864       74.8  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
TMDS-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 400mm x 300mm
   1600x1200      60.0*+   59.9  
   1280x1024      76.0     75.0     69.8     59.9  
   1152x864       75.0  
   1024x768       84.9     75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        84.6     75.0     72.8     65.4     60.0  
   720x400        70.1

The motherboard offers an ordinary vga interface, and there seems to be
some kind of pci card that adds another screen interface (dvi) to the
onboard intel graphics controller (I haven't seen this before).

I have a Dell 1901FP (19 in, 1280x1024 / 75 Hz) LCD screen
attached to the vga interface, and a Lenovo ThinkVision L201p (20.1 in, 1600 x 1200 / 60 Hz) LCD screen attached to the extra DVI interface.

After I installed Ubuntu, the screens are cloned.

I have read quite a bit on the internet, to find out how to set up the
workstation with two screens without success. Can any one help me set
up a correct xorg.conf configuration?

Regards
Charlie

rlhartmann · 05-14-2008, 09:44 PM

I have the same issue, I've tried about 8 various versions of linux and could not
get any of them to work. If anyone has a working xorg.conf with this intel chipset, please share.

CharlieBucket · 05-15-2008, 03:48 AM

I did get this hardware configuration to work. I used the following
xorg.conf file (I don't no if this is the "correct" way to do it,
or the best way, but it works fine for me on Ubuntu 8.04):

Code:

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"no"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
EndSection

# ***********************************************************
# Screen settings
# ***********************************************************
Section "Device"
	Identifier  "Card0"
	Driver      "intel"
	VendorName  "Intel Corporation"
	BoardName   "82945G/GZ Integrated Graphics Controller"
	BusID       "PCI:0:2:0"
	# Big Desktop (2 screens - one framebuffer)
	# horizontal arrangement: 
	# monitor connector 1 => right display
	#Option		"DesktopSetup"	"0x00000201"
	#Option "DesktopSetup" "CRT,LCD"
	
	Option "Monitor-VGA" "Dell"
	#Option "Monitor-TMDS-1" "Lenovo"
EndSection

Section "Device"
	Identifier  "Card1"
	Driver      "intel"
	VendorName  "Intel Corporation"
	BoardName   "82945G/GZ Integrated Graphics Controller"
	BusID       "PCI:0:2.1:0"
	# Big Desktop (2 screens - one framebuffer)
	# horizontal arrangement: 
	# monitor connector 1 => right display
	#Option		"DesktopSetup"	"0x00000201"
	#Option "DesktopSetup" "CRT,LCD"
	
	#Option "Monitor-VGA" "Dell"
	Option "Monitor-TMDS-1" "Lenovo"
EndSection


Section "Monitor"
	Identifier	"Dell"
	Option		"DPMS"
EndSection

Section "Monitor"
	Identifier	"Lenovo"
	Option		"DPMS"
EndSection


Section "Screen"
	Identifier	"Screen1"
	Monitor		"Dell"
	Device		"Card0"
        Defaultdepth    24
        SubSection "Display"
                Depth   24
		# Horizontal: 1600 + 1280 = 2880, Vertical: Max(1200, 1024) = 1200
                Virtual 2880    1200
        EndSubSection

EndSection

Section "Screen"
	Identifier	"Screen2"
	Monitor		"Lenovo"
	Device		"Card1"
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		0 "Screen1"
	Screen		1 "Screen2" LeftOf "Screen1"
EndSection

It shouldn't be necessary to set up two devices (Card0 and Card1) as
I understand. However, I don't know if it is disadvantageous either.

Regards
-C