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Thread: Intel HD 4000 and three monitors

  1. #1
    Join Date
    Feb 2013
    Posts
    434

    Default Intel HD 4000 and three monitors

    I read here that "3 monitors are support by Ivybridge only if 2 of those are identical and running at the same resolution (such as DP+DP, HDMI+HDMI etc)." I also read at Phoronix that "This means that two of the three outputs need to have the same connection type and same timings. However, most people in a triple monitor environment will have at least two -- if not all three -- of the monitors be identical and configured the same, so this shouldn't be a terribly huge issue." I have also seen this graphic (which I think might have come from Intel originally) suggesting that only systems with dual DisplayPorts can use three monitors (which is also repeated in the Intel FAQ).

    So my question is - has anybody actually got three identical monitors running off the integrated graphics with, say, HDMI+HDMI+DVI? I can't find any reports where someone says they did it and it worked. Are there any mITX motherboards which support this? Or have dual DisplayPort?

    The only SFF system I could find that should work is the Dell 9010, which has dual DisplayPort and VGA (not ideal). I do have three identical monitors with DVI-D (same clock) so according to the freedesktop people it should work, I am just sceptical as I have not seen a single person who says "works for me".

  2. #2
    Join Date
    Jun 2010
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    ฿ 16LDJ6Hrd1oN3nCoFL7BypHSEYL84ca1JR
    Posts
    1,049

    Default

    On my notebook the internal notebook monitor and two identical external monitors, one with DVI and one with HDMI running at the same time, works. That's all I have tested so far.

    The point is that not only must the resolution be the same, also the refresh rates must match. If you use
    Code:
    xrandr --verbose
    you can see the modes like this:
    Code:
      1920x1080 (0x53)  148.5MHz +HSync +VSync *current +preferred
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
    I'm not sure what exactly needs to match but it's at least that last number, 60.0Hz in my case.

    Sometimes activating the two external monitors is a bit buggy such that one doesn't get correctly enabled the first time but generally it works.

  3. #3
    Join Date
    Feb 2013
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    434

    Default

    Quote Originally Posted by ChrisXY View Post
    Code:
      1920x1080 (0x53)  148.5MHz +HSync +VSync *current +preferred
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
    I'm not sure what exactly needs to match but it's at least that last number, 60.0Hz in my case.
    As far as I know, it's the pixel clock that has to match - that would be 148.5MHz above.

  4. #4
    Join Date
    Feb 2013
    Posts
    434

    Default

    For anyone else interested in this topic, I found an old post here that reports 3 monitors working ok with a DisplayPort+HDMI+DVI setup.

  5. #5

    Question

    I have some issues with triple monitor configuration on HD4000

    I'm testing KINO-QM770-R10 motherboard

    Display Interfaces
    • DVI-I (VGA+DVI) integrated in the Intel® QM77 (up to 1920 x 1200 @60Hz)
    • 18/24-bit dual-channel LVDS support (up to 1920 x 1200 @60Hz)
    • Dual HDMI output supported (up to 1920 x 1200 @60H
    I'm testing following configuration:
    • LVDS disabled via jumpers
    • 1650x1050 on VGA1
    • 1920x1080 on DP2
    • 1920x1080 on DP3

    Kernel v3.5 hangs on boot if there is any monitor connected to DP2
    With v3.9 I'm able to pass boot section, however issuing:
    Code:
    xrand --output VGA1 --auto --output DP2 --auto --output DP3 --auto
    triggers the same continuous errors:
    Code:
    ...
    [drm:intel_dp_set_signal_levels], Using signal levels 00000000
    [drm:intel_dp_set_signal_levels], Using signal levels 02000000
    [drm:intel_dp_set_signal_levels], Using signal levels 04000000
    ...
    Here is some details on this bug I filled on Ubuntu Launchpad
    Code:
    Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
    VGA1 connected 1024x768+0+0 (0x50) normal (normal left inverted right x axis y axis) 433mm x 271mm
    	Identifier: 0x42
    	Timestamp:  257387
    	Subpixel:   unknown
    	Gamma:      1.0:1.0:1.0
    	Brightness: 1.0
    	Clones:    
    	CRTC:       0
    	CRTCs:      0 1 2
    	Transform:  1.000000 0.000000 0.000000
    	            0.000000 1.000000 0.000000
    	            0.000000 0.000000 1.000000
    	           filter: 
    	EDID:
    		00ffffffffffff004c2d7c023032454d
    		051201030e2b1b782aee95a3544c9926
    		0f5054bfef80b30081808140714f0101
    		0101010101017c2e90a0601a1e403020
    		3600b10f1100001a000000fd00384b1e
    		510e000a202020202020000000fc0053
    		796e634d61737465720a2020000000ff
    		00483958513131313636300a2020008c
      1680x1050 (0x49)  119.0MHz +HSync -VSync +preferred
            h: width  1680 start 1728 end 1760 total 1840 skew    0 clock   64.7KHz
            v: height 1050 start 1053 end 1059 total 1080           clock   59.9Hz
      1280x1024 (0x4a)  135.0MHz +HSync +VSync
            h: width  1280 start 1296 end 1440 total 1688 skew    0 clock   80.0KHz
            v: height 1024 start 1025 end 1028 total 1066           clock   75.0Hz
      1280x1024 (0x4b)  108.0MHz +HSync +VSync
            h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
            v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
      1280x960 (0x4c)  108.0MHz +HSync +VSync
            h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz
            v: height  960 start  961 end  964 total 1000           clock   60.0Hz
      1152x864 (0x4d)  108.0MHz +HSync +VSync
            h: width  1152 start 1216 end 1344 total 1600 skew    0 clock   67.5KHz
            v: height  864 start  865 end  868 total  900           clock   75.0Hz
      1024x768 (0x4e)   78.8MHz +HSync +VSync
            h: width  1024 start 1040 end 1136 total 1312 skew    0 clock   60.1KHz
            v: height  768 start  769 end  772 total  800           clock   75.1Hz
      1024x768 (0x4f)   75.0MHz -HSync -VSync
            h: width  1024 start 1048 end 1184 total 1328 skew    0 clock   56.5KHz
            v: height  768 start  771 end  777 total  806           clock   70.1Hz
      1024x768 (0x50)   65.0MHz -HSync -VSync *current
            h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
            v: height  768 start  771 end  777 total  806           clock   60.0Hz
      832x624 (0x51)   57.3MHz -HSync -VSync
            h: width   832 start  864 end  928 total 1152 skew    0 clock   49.7KHz
            v: height  624 start  625 end  628 total  667           clock   74.6Hz
      800x600 (0x52)   50.0MHz +HSync +VSync
            h: width   800 start  856 end  976 total 1040 skew    0 clock   48.1KHz
            v: height  600 start  637 end  643 total  666           clock   72.2Hz
      800x600 (0x53)   49.5MHz +HSync +VSync
            h: width   800 start  816 end  896 total 1056 skew    0 clock   46.9KHz
            v: height  600 start  601 end  604 total  625           clock   75.0Hz
      800x600 (0x54)   40.0MHz +HSync +VSync
            h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
            v: height  600 start  601 end  605 total  628           clock   60.3Hz
      800x600 (0x55)   36.0MHz +HSync +VSync
            h: width   800 start  824 end  896 total 1024 skew    0 clock   35.2KHz
            v: height  600 start  601 end  603 total  625           clock   56.2Hz
      640x480 (0x56)   31.5MHz -HSync -VSync
            h: width   640 start  664 end  704 total  832 skew    0 clock   37.9KHz
            v: height  480 start  489 end  491 total  520           clock   72.8Hz
      640x480 (0x57)   31.5MHz -HSync -VSync
            h: width   640 start  656 end  720 total  840 skew    0 clock   37.5KHz
            v: height  480 start  481 end  484 total  500           clock   75.0Hz
      640x480 (0x58)   30.2MHz -HSync -VSync
            h: width   640 start  704 end  768 total  864 skew    0 clock   35.0KHz
            v: height  480 start  483 end  486 total  525           clock   66.7Hz
      640x480 (0x59)   25.2MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
            v: height  480 start  490 end  492 total  525           clock   60.0Hz
      720x400 (0x5a)   28.3MHz -HSync +VSync
            h: width   720 start  738 end  846 total  900 skew    0 clock   31.5KHz
            v: height  400 start  412 end  414 total  449           clock   70.1Hz
    HDMI1 disconnected (normal left inverted right x axis y axis)
    	Identifier: 0x43
    	Timestamp:  257387
    	Subpixel:   unknown
    	Clones:    
    	CRTCs:      0 1 2
    	Transform:  1.000000 0.000000 0.000000
    	            0.000000 1.000000 0.000000
    	            0.000000 0.000000 1.000000
    	           filter: 
    	Broadcast RGB:	Automatic
    		supported: Automatic    Full         Limited 16:2
    	audio:	auto
    		supported: force-dvi    off          auto         on          
    DP1 disconnected (normal left inverted right x axis y axis)
    	Identifier: 0x44
    	Timestamp:  257387
    	Subpixel:   unknown
    	Clones:    
    	CRTCs:      0 1 2
    	Transform:  1.000000 0.000000 0.000000
    	            0.000000 1.000000 0.000000
    	            0.000000 0.000000 1.000000
    	           filter: 
    	Broadcast RGB:	Automatic
    		supported: Automatic    Full         Limited 16:2
    	audio:	auto
    		supported: force-dvi    off          auto         on          
    HDMI2 disconnected (normal left inverted right x axis y axis)
    	Identifier: 0x45
    	Timestamp:  257387
    	Subpixel:   unknown
    	Clones:    
    	CRTCs:      0 1 2
    	Transform:  1.000000 0.000000 0.000000
    	            0.000000 1.000000 0.000000
    	            0.000000 0.000000 1.000000
    	           filter: 
    	Broadcast RGB:	Automatic
    		supported: Automatic    Full         Limited 16:2
    	audio:	auto
    		supported: force-dvi    off          auto         on          
    HDMI3 disconnected (normal left inverted right x axis y axis)
    	Identifier: 0x46
    	Timestamp:  257387
    	Subpixel:   unknown
    	Clones:    
    	CRTCs:      0 1 2
    	Transform:  1.000000 0.000000 0.000000
    	            0.000000 1.000000 0.000000
    	            0.000000 0.000000 1.000000
    	           filter: 
    	Broadcast RGB:	Automatic
    		supported: Automatic    Full         Limited 16:2
    	audio:	auto
    		supported: force-dvi    off          auto         on          
    DP2 connected 1024x768+0+0 (0x50) normal (normal left inverted right x axis y axis) 640mm x 360mm
    	Identifier: 0x47
    	Timestamp:  257387
    	Subpixel:   unknown
    	Gamma:      1.0:1.0:1.0
    	Brightness: 1.0
    	Clones:    
    	CRTC:       1
    	CRTCs:      0 1 2
    	Transform:  1.000000 0.000000 0.000000
    	            0.000000 1.000000 0.000000
    	            0.000000 0.000000 1.000000
    	           filter: 
    	EDID:
    		00ffffffffffff00410c000001010101
    		07160103804024780af9aba2554a9a25
    		0f474a21080081800101010101010101
    		010101010101023a801871382d40582c
    		450080682100001e1b2150a051001e30
    		48883500806821000018000000fc0050
    		48494c495053204654560a20000000fd
    		00384c1e5311000a20202020202001ca
    		020326714e9f10202122140513041102
    		15060126090703150750830100006703
    		0c002000b82d023a80d072382d40102c
    		458080682100001e011d803e73382d40
    		7e2c458080682100001e011d80d0721c
    		1620102c258080682100009e011d00bc
    		52d01e20b828554080682100001e0000
    		0000000000000000000000000000001c
    	Broadcast RGB:	Automatic
    		supported: Automatic    Full         Limited 16:2
    	audio:	auto
    		supported: force-dvi    off          auto         on          
      1920x1080 (0x5b)  148.5MHz +HSync +VSync +preferred
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
      1920x1080 (0x5c)  148.5MHz +HSync +VSync
            h: width  1920 start 2448 end 2492 total 2640 skew    0 clock   56.2KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   50.0Hz
      1920x1080i (0x5d)   74.2MHz +HSync +VSync Interlace
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   33.8KHz
            v: height 1080 start 1084 end 1094 total 1125           clock   30.0Hz
      1920x1080i (0x5e)   74.2MHz +HSync +VSync Interlace
            h: width  1920 start 2448 end 2492 total 2640 skew    0 clock   28.1KHz
            v: height 1080 start 1084 end 1094 total 1125           clock   25.0Hz
      1920x1080 (0x5f)   74.2MHz +HSync +VSync
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   33.8KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   30.0Hz
      1920x1080 (0x60)   74.2MHz +HSync +VSync
            h: width  1920 start 2448 end 2492 total 2640 skew    0 clock   28.1KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   25.0Hz
      1920x1080 (0x61)   74.2MHz +HSync +VSync
            h: width  1920 start 2558 end 2602 total 2750 skew    0 clock   27.0KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   24.0Hz
      1280x1024 (0x4b)  108.0MHz +HSync +VSync
            h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
            v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
      1360x768 (0x62)   84.8MHz -HSync -VSync
            h: width  1360 start 1432 end 1568 total 1776 skew    0 clock   47.7KHz
            v: height  768 start  771 end  776 total  798           clock   59.8Hz
      1280x720 (0x63)   74.2MHz +HSync +VSync
            h: width  1280 start 1390 end 1430 total 1650 skew    0 clock   45.0KHz
            v: height  720 start  725 end  730 total  750           clock   60.0Hz
      1280x720 (0x64)   74.2MHz +HSync +VSync
            h: width  1280 start 1720 end 1760 total 1980 skew    0 clock   37.5KHz
            v: height  720 start  725 end  730 total  750           clock   50.0Hz
      1024x768 (0x50)   65.0MHz -HSync -VSync *current
            h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
            v: height  768 start  771 end  777 total  806           clock   60.0Hz
      800x600 (0x54)   40.0MHz +HSync +VSync
            h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
            v: height  600 start  601 end  605 total  628           clock   60.3Hz
      720x576 (0x65)   27.0MHz -HSync -VSync
            h: width   720 start  732 end  796 total  864 skew    0 clock   31.2KHz
            v: height  576 start  581 end  586 total  625           clock   50.0Hz
      720x480 (0x66)   27.0MHz -HSync -VSync
            h: width   720 start  736 end  798 total  858 skew    0 clock   31.5KHz
            v: height  480 start  489 end  495 total  525           clock   59.9Hz
      640x480 (0x59)   25.2MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
            v: height  480 start  490 end  492 total  525           clock   60.0Hz
      640x480 (0x67)   25.2MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
            v: height  480 start  490 end  492 total  525           clock   59.9Hz
    DP3 connected 1024x768+0+0 (0x50) normal (normal left inverted right x axis y axis) 510mm x 290mm
    	Identifier: 0x48
    	Timestamp:  257387
    	Subpixel:   unknown
    	Gamma:      1.0:1.0:1.0
    	Brightness: 1.0
    	Clones:    
    	CRTC:       2
    	CRTCs:      0 1 2
    	Transform:  1.000000 0.000000 0.000000
    	            0.000000 1.000000 0.000000
    	            0.000000 0.000000 1.000000
    	           filter: 
    	EDID:
    		00ffffffffffff001e6d2f57182e0200
    		0114010380331d780ac9a5a4564b9d25
    		125054210800b3008180814071400101
    		0101010101011a3680a070381f403020
    		3500fe221100001a023a801871382d40
    		532c4500fe221100001e000000fd0038
    		3d1e530f000a202020202020000000fc
    		0057323336330a2020202020202001b4
    		02031df14a900403011412051f101323
    		0907078301000065030c001000023a80
    		1871382d40582c4500fe221100001e01
    		1d8018711c1620582c2500fe22110000
    		9e011d007251d01e206e285500fe2211
    		00001e8c0ad08a20e02d10103e9600fe
    		22110000180000000000000000000000
    		000000000000000000000000000000e6
    	Broadcast RGB:	Automatic
    		supported: Automatic    Full         Limited 16:2
    	audio:	auto
    		supported: force-dvi    off          auto         on          
      1920x1080 (0x68)  138.5MHz +HSync -VSync +preferred
            h: width  1920 start 1968 end 2000 total 2080 skew    0 clock   66.6KHz
            v: height 1080 start 1083 end 1088 total 1111           clock   59.9Hz
      1920x1080 (0x5b)  148.5MHz +HSync +VSync
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
      1920x1080 (0x5c)  148.5MHz +HSync +VSync
            h: width  1920 start 2448 end 2492 total 2640 skew    0 clock   56.2KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   50.0Hz
      1920x1080 (0x69)  148.5MHz +HSync +VSync
            h: width  1920 start 2003 end 2047 total 2200 skew    0 clock   67.5KHz
            v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
      1920x1080i (0x5d)   74.2MHz +HSync +VSync Interlace
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   33.8KHz
            v: height 1080 start 1084 end 1094 total 1125           clock   30.0Hz
      1920x1080i (0x5e)   74.2MHz +HSync +VSync Interlace
            h: width  1920 start 2448 end 2492 total 2640 skew    0 clock   28.1KHz
            v: height 1080 start 1084 end 1094 total 1125           clock   25.0Hz
      1680x1050 (0x49)  119.0MHz +HSync -VSync
            h: width  1680 start 1728 end 1760 total 1840 skew    0 clock   64.7KHz
            v: height 1050 start 1053 end 1059 total 1080           clock   59.9Hz
      1280x1024 (0x4b)  108.0MHz +HSync +VSync
            h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
            v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
      1280x960 (0x4c)  108.0MHz +HSync +VSync
            h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz
            v: height  960 start  961 end  964 total 1000           clock   60.0Hz
      1152x864 (0x6a)   81.6MHz -HSync +VSync
            h: width  1152 start 1216 end 1336 total 1520 skew    0 clock   53.7KHz
            v: height  864 start  865 end  868 total  895           clock   60.0Hz
      1280x720 (0x64)   74.2MHz +HSync +VSync
            h: width  1280 start 1720 end 1760 total 1980 skew    0 clock   37.5KHz
            v: height  720 start  725 end  730 total  750           clock   50.0Hz
      1280x720 (0x63)   74.2MHz +HSync +VSync
            h: width  1280 start 1390 end 1430 total 1650 skew    0 clock   45.0KHz
            v: height  720 start  725 end  730 total  750           clock   60.0Hz
      1024x768 (0x50)   65.0MHz -HSync -VSync *current
            h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
            v: height  768 start  771 end  777 total  806           clock   60.0Hz
      800x600 (0x54)   40.0MHz +HSync +VSync
            h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
            v: height  600 start  601 end  605 total  628           clock   60.3Hz
      720x576 (0x65)   27.0MHz -HSync -VSync
            h: width   720 start  732 end  796 total  864 skew    0 clock   31.2KHz
            v: height  576 start  581 end  586 total  625           clock   50.0Hz
      720x480 (0x66)   27.0MHz -HSync -VSync
            h: width   720 start  736 end  798 total  858 skew    0 clock   31.5KHz
            v: height  480 start  489 end  495 total  525           clock   59.9Hz
      640x480 (0x59)   25.2MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
            v: height  480 start  490 end  492 total  525           clock   60.0Hz
      640x480 (0x67)   25.2MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
            v: height  480 start  490 end  492 total  525           clock   59.9Hz
    Any idea why I have this issue?

    BTW, thing that boggles me the most - same triple monitor configuration works fine in W7.

  6. #6
    Join Date
    Feb 2013
    Posts
    434

    Default

    Quote Originally Posted by nadrimajstor View Post
    I have some issues with triple monitor configuration on HD4000
    It looks like you are running some version of Ubuntu 12.04? As far as I can see, the latest Intel driver in 12.04.02LTS was released in Feb 2012, which is pretty old. So you might want to try something more recent: either the Xorg Edgers PPA, Ubuntu 12.10 or the 13.04beta, or the Intel installer at https://01.org/linuxgraphics/

  7. #7

    Default

    Quote Originally Posted by chrisb View Post
    It looks like you are running some version of Ubuntu 12.04? As far as I can see, the latest Intel driver in 12.04.02LTS was released in Feb 2012, which is pretty old. So you might want to try something more recent: either the Xorg Edgers PPA, Ubuntu 12.10 or the 13.04beta, or the Intel installer at https://01.org/linuxgraphics/
    You are correct. It is Ubuntu 12.04.2. Kernel and X version in 12.04.2 should be the ones from 12.10. I've tried Xorg Edgers PPA - no luck. Intel installer have issues with package names and fail to install on 12.04.2.

    AFAICT looks like the problem resides in the kernel. I've tried with stock kernel 3.9 and thing are slightly better: It dose not hangs on boot (probably because resolution is automatically set to 1024x768 for all outputs). However raising resolution to monitor native values reproduce the error.

    You've mentioned in previous posts that there are some resolution limitation - but exactly the same monitor configuration works fine in Win7 so I assume that hardware is ok.

    Any idea is much appreciated.

  8. #8
    Join Date
    Feb 2013
    Posts
    434

    Default

    Quote Originally Posted by nadrimajstor View Post
    Any idea is much appreciated.
    It sounds like a bug. I would report it as a bug at https://01.org/linuxgraphics/community/kernel and ask on the intel-gfx mailing list.

    I've had problems in the past with mismatched kernel/xorg versions so it's usually best to try the same versions as upstream are using for testing.

    Quote Originally Posted by nadrimajstor View Post
    Intel installer have issues with package names and fail to install on 12.04.2.
    Ubuntu 12.04 is supposed to be supported by the Intel installer, so report it as a bug to Intel if it doesn't work. Make sure that you're on a fresh install though (if you've mixed 12.04 base with random PPA packages they will likely say it's unsupported)

  9. #9

    Default

    Quote Originally Posted by chrisb View Post
    It sounds like a bug. I would report it as a bug at https://01.org/linuxgraphics/community/kernel and ask on the intel-gfx mailing list.
    I've had problems in the past with mismatched kernel/xorg versions so it's usually best to try the same versions as upstream are using for testing.
    Ask on mailing list, report a bug. Got it. Thanks.

    Ubuntu 12.04 is supposed to be supported by the Intel installer, so report it as a bug to Intel if it doesn't work. Make sure that you're on a fresh install though (if you've mixed 12.04 base with random PPA packages they will likely say it's unsupported)
    ppa-purge usually take good care of removing PPA specific packages.

    Yeah, Intel installer dose support 12.04 but it gets confused with 12.04.2 where some packages are named a bit different e.g. xserver-xorg-lts-quantal xserver-xorg-video-intel-lts-quantal ...

    BTW, connecting all three monitors via HDMI works fine. And monitors with DVI inputs connected via HDMI adapters don't work on this board.
    I've never encountered device that actually care if it is DVI or HDMI (This lead me to belief that same digital signal propagate no matter what connector type is (DVI, HDMI or DisplayPort))

  10. #10
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    Quote Originally Posted by nadrimajstor View Post
    Yeah, Intel installer dose support 12.04 but it gets confused with 12.04.2 where some packages are named a bit different e.g. xserver-xorg-lts-quantal xserver-xorg-video-intel-lts-quantal ...
    I'd still report it as a bug - there's not much point in supporting 12.04 and not 12.04.2, they're both LTS, it's the same version just with "major bug fixes".

    Quote Originally Posted by nadrimajstor View Post
    BTW, connecting all three monitors via HDMI works fine. And monitors with DVI inputs connected via HDMI adapters don't work on this board.
    I've never encountered device that actually care if it is DVI or HDMI (This lead me to belief that same digital signal propagate no matter what connector type is (DVI, HDMI or DisplayPort))
    Are the monitors and cables DVI-D? DVI-I also carries an analog signal so it is possible for hardware to be DVI-I only.

    Also for three identical (same pixel clock) monitors to work I have read that the connection type is also supposed to be the same - but I never understood if DVI-D and HDMI are considered "the same" in this context so you can mix them. http://en.wikipedia.org/wiki/Intel_H...ctive_displays

    See also: Digital_Visual_Interface#Clock_and_data_relationsh ip

    Ivy Bridge HD2500 and HD4000 chipsets are advertised as supporting three active monitors but many users have found that this does not work for them due to the chipset only supporting two active monitors in many common configurations. The reason for this is that the chipset only includes two PLLs; a PLL generates a pixel clock at a certain frequency which is used to sync the timings of data being transferred between the GPU and displays. Therefore, three simultaneously active monitors can only be achieved by a hardware configuration that requires only two unique pixel clocks, such as:

    * Using 2 or 3 active DisplayPort connections. DisplayPort requires only a single pixel clock for all active connections, regardless of how many there are (this is not the case for non-active connections, which would require an extra pixel clock for each connection)

    * By using two non-DisplayPort connections of the same connection type (ie. HDMI+HDMI) and same clock frequency (ie. connected to two identical monitors at the same resolution) so that a single unique pixel clock can be shared between both connections.

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