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FAQ, support multiple monitor 3 or 4 using dual video card SLI or Crossfire

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Old 11-25-2011
FAQ, support multiple monitor 3 or 4 using dual video card SLI or Crossfire
Hi,

I would like to ask if someone has knowlodge or perhaps own/experience this kind of a machine, Im buying a desktop with a plan of having multiple monitor 3 or 4,now my question is, i want to used the sli or crossfire config with each video card has 2 dvi or vga connector, does this 2 connection wil help me achieve my goal of 4 monitor. 1 monitor each dvi or vga ports. How about in our lovely linux OS this will have no problem right.

I hope someone out there would be kind to share his/her knowledge or enlight me as to what i planning to achieve..

Thanks in advance for future input..

Addition: I just read, i can use 4 or 3 using 2 video card but the video card is capable of multidisplay.
Last edited by jao_madn; 11-25-2011 at 06:30 PM..
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LEARN ABOUT CENTOS

glide

GLIDE(4)						     Kernel Interfaces Manual							  GLIDE(4)

NAME

       glide - Glide video driver

SYNOPSIS

       Section "Device"
	 Identifier "devname"
	 Driver "glide"
	 ...
       EndSection

DESCRIPTION

       glide  is  an  Xorg  driver  for  Glide	capable video boards (such as 3Dfx Voodoo boards). This driver is mainly for Voodoo 1 and Voodoo 2
       boards, later boards from 3Dfx have 2D built-in and you should preferably use a driver separate for those boards or  the  fbdev(4)  driver.
       This  driver  is a bit special because Voodoo 1 and 2 boards are very much NOT made for running 2D graphics. Therefore, this driver uses no
       hardware acceleration (since there is no acceleration for 2D, only 3D). Instead it is implemented with the help of a  "shadow"  framebuffer
       that  resides  entirely	in  RAM.  Selected  portions of this shadow framebuffer are then copied out to the Voodoo board at the right time.
       Because of this, the speed of the driver is very dependent on the CPU. But since the CPU is nowadays actually rather fast at  moving  data,
       we get very good speed anyway, especially since the whole shadow framebuffer is in cached RAM.

       This  driver supports 16 and 24 bit color modes. The 24 bit color mode uses a 32 bit framebuffer (it has no support for 24 bit packed-pixel
       framebuffers). Notice that the Voodoo boards can only display 16 bit color, but the shadow framebuffer can be run  in  24  bit  color.  The
       point of supporting 24 bit mode is that this enables you to run in a multihead configuration with Xinerama together with another board that
       runs in real 24 bit color mode. (All boards must run the same color depth when you use Xinerama).

       Resolutions supported are: 640x480, 800x600, 960x720, 1024x768, 1280x1024 and 1600x1200. Note that not all modes will work  on  all  Voodoo
       boards. It seems that Voodoo 2 boards support no higher than 1024x768 and Voodoo 1 boards can go to 800x600. If you see a message like this
       in the output from the server:

	 (EE) GLIDE(0): grSstWinOpen returned ...

       Then you are probably trying to use a resolution that is supported by the driver but not supported by the hardware.

       Refresh rates supported are: 60Hz, 75Hz and 85Hz. The refresh rate used is derived from the normal mode line according to the following ta-
       ble:

       Mode-line refresh rate	   Used refresh rate

	  0-74 Hz
				     60 Hz

	 74-84 Hz
				     75 Hz

	 84-   Hz
				     85 Hz

       Thus, if you use a modeline that for example has a 70Hz refresh rate you will only get a 60Hz refresh rate in actuality.

       Selecting  which Voodoo board to use with the driver is done by using an option called "GlideDevice" in the "Device" section. (If you don't
       have this option present then the first board found will be selected for that Device section). For example: To use the first Voodoo  board,
       use a "Device" section like this, for example:

       Section "Device"
	  Identifier  "Voodoo"
	  Driver      "glide"
	  Option      "dpms" "on"
	  Option      "GlideDevice" "0"
       EndSection

       And  if	you  have more than one Voodoo board, add another "Device" section with a GlideDevice option with value 1, and so on. (You can use
       more than one Voodoo board, but SLI configured boards will be treated as a single board.)

       Multihead and Xinerama configurations are supported.

       Limited support for DPMS screen saving is available. The "standby" and "suspend" modes are just painting the screen black. The  "off"  mode
       turns the Voodoo board off and thus works correctly.

       This driver does not support a virtual screen size different from the display size.

SUPPORTED HARDWARE

       The glide driver supports any board that can be used with Glide (such as 3Dfx Voodoo boards)

CONFIGURATION DETAILS

       Please refer to xorg.conf(5) for general configuration details.	This section only covers configuration details specific to this driver.

       The following driver Options are supported:

       Option "OnAtExit" "boolean"
	      If  true,  will leave the Voodoo board on when the server exits. Useful in a multihead setup when only the Voodoo board is connected
	      to a second monitor and you don't want that monitor to lose signal when you quit the server. Put this option in the Device  section.
	      Default: off.

       Option "GlideDevice" "integer"
	      Selects  which Voodoo board to use. (Or boards, in an SLI configuration).  The value should be 0 for the first board, 1 for the sec-
	      ond and so on.  If it is not present, the first Voodoo board found will be selected.  Put this option in the Device section.

EXAMPLE

       Here is an example of a part of an xorg.conf file that uses a multihead configuration with two monitors. The first monitor is driven by the
       fbdev video driver and the second monitor is driven by the glide driver.

       Section "Monitor"
	  Identifier	  "Monitor 1"
	  VendorName	  "Unknown"
	  ModelName	  "Unknown"
	  HorizSync	  30-70
	  VertRefresh	  50-80

	  # 1024x768 @ 76 Hz, 62.5 kHz hsync
	  Modeline "1024x768" 85 1024 1032 1152 1360 768 784 787 823
       EndSection

       Section "Monitor"
	  Identifier	  "Monitor 2"
	  VendorName	  "Unknown"
	  ModelName	  "Unknown"
	  HorizSync	  30-70
	  VertRefresh	  50-80

	  # 1024x768 @ 76 Hz, 62.5 kHz hsync
	  Modeline "1024x768" 85 1024 1032 1152 1360 768 784 787 823
       EndSection

       Section "Device"
	  Identifier  "fb"
	  Driver      "fbdev"
	  Option      "shadowfb"
	  Option      "dpms" "on"
	  # My video card is on the AGP bus which is usually
	  # located as PCI bus 1, device 0, function 0.
	  BusID       "PCI:1:0:0"
       EndSection

       Section "Device"
	  # I have a Voodoo 2 board
	  Identifier  "Voodoo"
	  Driver      "glide"
	  Option      "dpms" "on"
	  # The next line says I want to use the first board.
	  Option      "GlideDevice" "0"
       EndSection

       Section "Screen"
	 Identifier   "Screen 1"
	 Device  "fb"
	 Monitor "Monitor 1"
	 DefaultDepth 16
	 Subsection "Display"
	   Depth 16
	   Modes "1024x768"
	 EndSubSection
       EndSection

       Section "Screen"
	 Identifier   "Screen 2"
	 Device  "Voodoo"
	 Monitor "Monitor 2"
	 DefaultDepth 16
	 Subsection "Display"
	   Depth 16
	   Modes "1024x768"
	 EndSubSection
       EndSection

       Section "ServerLayout"
	 Identifier   "Main Layout"
	 # Screen 1 is to the right and screen 2 is to the left
	 Screen  "Screen 2"
	 Screen  "Screen 1" "" "" "Screen 2" ""
       EndSection

       If  you	use this configuration file and start the server with the +xinerama command line option, the two monitors will be showing a single
       large area where windows can be moved between monitors and overlap from one monitor to the other. Starting the X server with  the  Xinerama
       extension can be done for example like this:

       $ xinit -- +xinerama

FILES

       glide_drv.o

SEE ALSO

       Xorg(1), xorg.conf(5), Xserver(1), X(7)

AUTHORS

       Author: Henrik Harmsen.

X Version 11						      xf86-video-glide 1.2.0							  GLIDE(4)