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Ook 06-21-2013 01:17 PM

How to enable three monitors - nVidia Gt 610 (cannot find crtc for output...)
 
Slackware 14.0 64 bit
nVidia GT 610 video card

I'm trying to get three monitors to work. The card has a DVI output, an HDMI output, and a VGA output. I have a monitor connected to each of these. By using xrandr, I can get any combination of any two monitors to turn on at any time. I can NOT get all three monitors to turn on at the same time. If I have two on and try to enable the third, I get:

xrandr: cannot find crtc for output VGA-0

This is the output of xrandr -q --verbose:

Code:

Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
        Identifier: 0x27b
        Timestamp:  3391270
        Subpixel:  unknown
        Clones:   
        CRTCs:      0 1
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                  filter:
        BorderDimensions: 
        Border: CARDINAL(6) (format 16 items 4) ????
        SignalFormat:        VGA
                supported: VGA       
        ConnectorType:        DVI-I
        ConnectorNumber: 0 (0x00000000)
        _ConnectorLocation: 0 (0x00000000)
VGA-0 connected (normal left inverted right x axis y axis)
        Identifier: 0x27c
        Timestamp:  3391270
        Subpixel:  unknown
        Clones:   
        CRTCs:      0 1
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                  filter:
        EDID:
                00ffffffffffff0010ac004042354241
                0f0e01030e261f78ee6f86a25a4d9424
                1a4f54a54b00714f8180010101010101
                010101010101302a009851002a403070
                1300782d1100001e000000ff00355932
                3332343435414235420a000000fc0044
                454c4c203139303146500a20000000fd
                00384c1e500e000a202020202020003e
        BorderDimensions: 
        Border: CARDINAL(6) (format 16 items 4) ????
        SignalFormat:        VGA
                supported: VGA       
        ConnectorType:        VGA
        ConnectorNumber: 2 (0x00000002)
        _ConnectorLocation: 2 (0x00000002)
  1280x1024 (0x27d)  108.0MHz +HSync +VSync +preferred
        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
  1280x1024 (0x27e)  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
  1152x864 (0x27f)  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 (0x280)  78.8MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.0KHz
        v: height  768 start  769 end  772 total  800          clock  75.0Hz
  1024x768 (0x281)  65.0MHz -HSync -VSync
        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 (0x282)  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 (0x283)  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
  640x480 (0x284)  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 (0x285)  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
DVI-I-1 connected 1920x1080+0+0 (0x287) normal (normal left inverted right x axis y axis) 531mm x 299mm
        Identifier: 0x286
        Timestamp:  3391270
        Subpixel:  unknown
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:   
        CRTC:      1
        CRTCs:      0 1
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                  filter:
        EDID:
                00ffffffffffff0010ac7fa053463630
                0916010380301b78ea3d25a35951a025
                0f5054a54b00714f8180d1c001010101
                010101010101023a801871382d40582c
                4500132b2100001e000000ff004e444d
                5250323333303646530a000000fc0044
                454c4c205032323132480a20000000fd
                00384c1e5311000a2020202020200085
        BorderDimensions: 
        Border: CARDINAL(6) (format 16 items 4) ????
        SignalFormat:        TMDS
                supported: TMDS       
        ConnectorType:        DVI-I
        ConnectorNumber: 0 (0x00000000)
        _ConnectorLocation: 0 (0x00000000)
  1920x1080 (0x287)  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
  1280x1024 (0x27e)  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 (0x27d)  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
  1152x864 (0x27f)  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 (0x280)  78.8MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.0KHz
        v: height  768 start  769 end  772 total  800          clock  75.0Hz
  1024x768 (0x281)  65.0MHz -HSync -VSync
        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 (0x282)  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 (0x283)  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
  640x480 (0x284)  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 (0x285)  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
HDMI-0 connected 1920x1080+1920+0 (0x287) normal (normal left inverted right x axis y axis) 531mm x 299mm
        Identifier: 0x288
        Timestamp:  3391270
        Subpixel:  unknown
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:   
        CRTC:      0
        CRTCs:      0 1
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                  filter:
        EDID:
                00ffffffffffff0010ac7fa053343630
                0916010380301b78ea3d25a35951a025
                0f5054a54b00714f8180d1c001010101
                010101010101023a801871382d40582c
                4500132b2100001e000000ff004e444d
                5250323333303634530a000000fc0044
                454c4c205032323132480a20000000fd
                00384c1e5311000a20202020202000a9
        BorderDimensions: 
        Border: CARDINAL(6) (format 16 items 4) ????
        SignalFormat:        TMDS
                supported: TMDS       
        ConnectorType:        HDMI
        ConnectorNumber: 1 (0x00000001)
        _ConnectorLocation: 1 (0x00000001)
  1920x1080 (0x287)  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
  1280x1024 (0x27e)  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 (0x27d)  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
  1152x864 (0x27f)  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 (0x280)  78.8MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.0KHz
        v: height  768 start  769 end  772 total  800          clock  75.0Hz
  1024x768 (0x281)  65.0MHz -HSync -VSync
        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 (0x282)  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 (0x283)  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
  640x480 (0x284)  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 (0x285)  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

I notice that there are only 2 crtc's available. Does that mean it only allows two displays to be turned on at any one time? I can't find a good definition of exactly what a crtc is. Nor can I find any specs on this card that definitely say it does or does not support three monitors.

So - is it possible to have three monitors on at the same time with this card?

Ook 06-21-2013 02:20 PM

PS: I have another box with an nVidia 660, which has four crtcs, and it supports four monitors. At this point I'm fairly sure that the number of crtcs determines how many displays it can enable at once. Anyone able to confirm or correct this assumption?

wjcofkc 12-06-2013 06:11 AM

Ever get anywhere with this?
 
I see that your post was never answered, I have the same video card and was wondering if you ever figured anything out...

wjcofkc 12-06-2013 09:57 AM

I found my answer. It is not possible.

mattca 12-06-2013 10:19 AM

I'm not an expert, but I think the number of CRTCs determines the number of displays you can use at once. I have a dock with multiple display outputs that I've tried using 3 displays with. xrandr sees all 3, and I can enable any combination of 2, but when I try to enable the 3rd I get the above error.

I think the point of multiple outputs is to allow you to use different types of monitors, not necessarily to use all of the outputs at once.

wjcofkc 12-06-2013 10:24 AM

Shared Controller
 
It turns out that on the 610 the DVI & HDMI share the same controller, making three monitors impossible. I would need to get at minimum a 640 to have three monitors. That's what happens when you go super cheap : )

mattca 12-06-2013 11:00 AM

You can also use a USB to VGA adapter. 14.1 comes with xrandr 1.4, which supports displaylink devices out of the box, using the udl driver (blacklist udlfb). It's a little laggy, but it works.


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