Unable to detect 3 monitors on Emerald Lake (FC16 64bit)

[varunlohia]

Hi,

I am trying to connect 3 monitors on IvyBridge Emerald Lake(stepping C0), FC 16 64 bit.
But only 2 monitors are getting detected.

Following 2011Q4 packages are used :-
Kernel: Linux 3.1 release
3D driver: mesa 7.11.2 release
2D driver: xf86-video-intel 2.17.0 release
Libdrm: libdrm-2.4.27 release
Libva: libva-1.0.15 release
Vaapi-driver-intel: vaapi-driver-intel-1.0.15 release.

Three monitors are connected by VGA , HDMI ,DP(display port).


Thanks,
Varun

[Rubberman]

You probably need to add the 3rd monitor/display/port to the /etc/X11/xorg.conf file. What is your video card(s)?

[varunlohia]

Hi,

I have added the 3rd monitor to xorg.conf, but the third display always comes disconnected. Attaching xorg.conf I am using.

Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
Screen 2 "Screen2" LeftOf "Screen1"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

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

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

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
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 "Monitor Vendor"
ModelName "Monitor Model"
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection

Section "Monitor"
Identifier "Monitor2"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "DRI" # [<bool>]
#Option "ColorKey" # <i>
#Option "VideoKey" # <i>
#Option "FallbackDebug" # [<bool>]
#Option "Tiling" # [<bool>]
#Option "LinearFramebuffer" # [<bool>]
#Option "Shadow" # [<bool>]
#Option "SwapbuffersWait" # [<bool>]
#Option "TripleBuffer" # [<bool>]
#Option "XvPreferOverlay" # [<bool>]
#Option "DebugFlushBatches" # [<bool>]
#Option "DebugFlushCaches" # [<bool>]
#Option "DebugWait" # [<bool>]
#Option "HotPlug" # [<bool>]
#Option "RelaxedFencing" # [<bool>]
Identifier "Card0"
Driver "intel"
BusID "PCI:0:2:0"
EndSection

Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "ShadowFB" # [<bool>]
#Option "Rotate" # <str>
#Option "fbdev" # <str>
#Option "debug" # [<bool>]
Identifier "Card1"
Driver "intel"
BusID "PCI:0:2:0"
EndSection

Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "ShadowFB" # [<bool>]
#Option "DefaultRefresh" # [<bool>]
#Option "ModeSetClearScreen" # [<bool>]
Identifier "Card2"
Driver "intel"
BusID "PCI:0:2:0"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "Screen1"
Device "Card1"
Monitor "Monitor1"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
173,10 78%
Section "Screen"
Identifier "Screen2"
Device "Card2"
Monitor "Monitor2"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
59,0-1 39%

I am using integrated GPU for all displays, not using any external card.

[Rubberman]

You might look on the Intel web site and ask their tech support people if a 3 monitor setup is possible with this gear. Also, do you want to have the same output on all 3 displays, or do you want to use them as one big virtual display, or do you want separate data displayed on each?

[SL6-A1000]

It may not even be the GPU! I have a feeling that it might be related to the output type (i.e. Analog & Digital). From what i can see your trying to set-up 3 monitors using VGA, HDMI, & DP. If my hunch is correct, analog and digital signals are different and not compatible with one another. Which would lead me to the conclusion that a GPU may not be capable of displaying analog and digital signals at the same time unless they are independent of each other, like a clone display.
As you may know DVI-I and DP are both intermittent devices for that period between analog and digital, thus they are capable of working in either format.

I have a couple of questions to clarify/ test my theory:
1. When you use 3 monitors and VGA is not the primary, is this monitor always the one that does not work?
2. (Alternative to 1) If you have VGA has the primary is the HDMI monitor the one that will not work?
3. Can the VGA and HDMI output work in an extended display if you disable or don't use the DP?
4. Does the 3 monitors make an extended display of the 2 that are compatible but uses a clone display on the 3rd monitor?

The 4th question is more for me, to see if your problem is similar to mine. As i tried running 3 monitors at one stage on a laptop with HDMI & VGA output, but it would always result in one of those 2 monitors being a clone and the other an extended display, but i could never get the VGA & HDMI to work together in an extended display with the laptop screen disabled.