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Thread: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resolution

  1. #11
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    I am using onboard, Intel, vga to acer and radeon graphic card vga to lg. I tried lg with onboard Intel, still the result was same.
    As the HDMI port is not working, that's why I am using vga to connect both the monitors.
    Note:- My LG monitor does shows 1600x900 resolution in windows 7. So the problem is with Ubuntu OS.
    Last edited by mksundaram2; May 14th, 2023 at 09:15 AM.

  2. #12
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    this is the output:
    sundaram@mks:~$ xrandr -q
    Screen 0: minimum 16 x 16, current 2944 x 1204, maximum 32767 x 32767
    XWAYLAND0 connected primary 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
    1024x768 59.92*+
    800x600 59.86
    640x480 59.38
    320x240 59.52
    720x480 59.71
    640x400 59.95
    320x200 58.96
    1024x576 59.90
    864x486 59.92
    720x400 59.55
    640x350 59.77
    XWAYLAND1 connected 1920x1080+1024+124 (normal left inverted right x axis y axis) 530mm x 300mm
    1920x1080 59.96*+
    1440x1080 59.99
    1400x1050 59.98
    1280x1024 59.89
    1280x960 59.94
    1152x864 59.96
    1024x768 59.92
    800x600 59.86
    640x480 59.38
    320x240 59.52
    1680x1050 59.95
    1440x900 59.89
    1280x800 59.81
    720x480 59.71
    640x400 59.95
    320x200 58.96
    1600x900 59.95
    1368x768 59.88
    1280x720 59.86
    1024x576 59.90
    864x486 59.92
    720x400 59.55
    640x350 59.77
    sundaram@mks:~$

    ZWAYLAND0 is my LG Monitor, I assume, and XWAYLAND1 is my Acer Monitor. I don't see 1600x900 resolution in XWAYLAND0 and one more thing on display settings it only has three option to select from they are: 1024x768, 848x480 and 800x600 only.
    Last edited by mksundaram2; May 14th, 2023 at 10:23 AM.

  3. #13
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    am I missing something, If so kindly let me know. As I don't see any replies to my last post. Thanks

  4. #14
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    I didn't see your post from 3 days ago, and I am busy making changes and improvements to the UbuntuForums 'system-info' script... My apologies for your wait... (Besides, this is volunteer work, because i like to help. Not a job.)

    I asked you to change your login to Xorg XServer to try. I can see by the Port Names (YWAYLAND, XWAYLAND) that you are still using Wayland... You will not be able to add a resolution mode or use a Custom EDID unless you are using Xorg. Wayland does not have the facility for that. Besides, you were asked to try Xorg, to see if it recognized anything different, right?

    I'll wait... Until you change and retest that.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  5. #15
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    I sincerely apologize if my previous post unintentionally conveyed any disrespect towards the selfless work you do. I deeply appreciate and admire your dedication and contributions to the community.

    I would change to Xorg and post the result of the same. Thanks

  6. #16
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    I think option #1 from post #10 is what will help you. It assumes that either you can't get a clean EDID table to dump to a file, or that it just doesn't matter and you are going to set to a mode anyways...

    You might try option #2, just to see if you can offload the LG's EDID table from it, but if it doesn't, then there is no need to do that.

    There is a Windows version of that type of the EDID tool that is GUI, that might be able to connect to your LG display. I have used it. It is one that was recommended to me by nVidia for dumping EDID tables to files, via Windows OS:
    https://www.entechtaiwan.com/util/moninfo.shtm

    If using Xorg, then I use the Xorg.0.log file:
    Code:
    grep '(II) modeset(G0):' /var/log/Xorg.0.log
    ...and look at the info the GPU see's when it queries the attached display's EDID table.
    Last edited by MAFoElffen; May 18th, 2023 at 07:51 AM.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  7. #17
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    Most will tell you that you can "only" use Xorg to change the resolution manually... And to be able to use xrandr or xorg.conf to change it. And that it won't work with Wayland...

    That is the official accepted answer... But you can change things in Wayland via the dbus API... I have tested and used this script, which adds xrandr type of functionality, while using Wayland... If you are set on using Wayland, then I'll share the link to you. It's still a use at your own risk disclaimer.
    RE: https://gitlab.com/Oschowa/gnome-randr

    Download. Make it executable.

    Test to see what it sees
    Code:
    ./gnome-randr.py
    Set to a (found) mode via a (found) port...
    Code:
    ./gnome-randr.py --output VGA-1 --rotate normal --mode 1600x900
    I don't know if it can add a mode that is "not there" (like xrandr)... I don't see the Python code to implement that in the script code.

    Otherwise, with xrandr
    Code:
    xrandr --newmode Modeline "1600x900"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync
    xrandr --addmode VGA-1 1600x900
    xrandr --output VGA-1 --mode 1600x900 -rate 60
    If that works, then add to a file ~/.xinitrc or create an /etc/X11/xorg.conf file to add that mode in it, and use it...
    Last edited by MAFoElffen; May 18th, 2023 at 08:33 AM.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  8. #18
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    Code:
    The result of post #10 Option 1:
    
    
    sundaram@mks:~$ xrandr -q --verbose
    Screen 0: minimum 320 x 200, current 2624 x 900, maximum 16384 x 16384
    HDMI-0 disconnected (normal left inverted right x axis y axis)
        Identifier: 0x52
        Timestamp:  119890
        Subpixel:   horizontal rgb
        Clones:    
        CRTCs:      0 1 2 3
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        TearFree: auto 
            supported: off, on, auto
        output_csc: bypass 
            supported: bypass, tvrgb, ycbcr601, ycbcr709
        audio: auto 
            supported: off, on, auto
        scaling mode: None 
            supported: None, Full, Center, Full aspect
        dither: off 
            supported: off, on
        underscan vborder: 0 
            range: (0, 128)
        underscan hborder: 0 
            range: (0, 128)
        underscan: off 
            supported: off, on, auto
        coherent: 1 
            range: (0, 1)
        link-status: Good 
            supported: Good, Bad
        CONNECTOR_ID: 50 
            supported: 50
        non-desktop: 0 
            range: (0, 1)
    DVI-0 disconnected (normal left inverted right x axis y axis)
        Identifier: 0x53
        Timestamp:  119890
        Subpixel:   horizontal rgb
        Clones:    
        CRTCs:      0 1 2 3
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        TearFree: auto 
            supported: off, on, auto
        output_csc: bypass 
            supported: bypass, tvrgb, ycbcr601, ycbcr709
        audio: auto 
            supported: off, on, auto
        scaling mode: None 
            supported: None, Full, Center, Full aspect
        dither: off 
            supported: off, on
        underscan vborder: 0 
            range: (0, 128)
        underscan hborder: 0 
            range: (0, 128)
        underscan: off 
            supported: off, on, auto
        coherent: 1 
            range: (0, 1)
        link-status: Good 
            supported: Good, Bad
        CONNECTOR_ID: 52 
            supported: 52
        non-desktop: 0 
            range: (0, 1)
    VGA-1 connected primary 1024x768+0+0 (0x56) normal (normal left inverted right x axis y axis) 0mm x 0mm
        Identifier: 0x54
        Timestamp:  119890
        Subpixel:   no subpixels
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:    
        CRTC:       0
        CRTCs:      0 1 2 3
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        _MUTTER_PRESENTATION_OUTPUT: 0 
        TearFree: auto 
            supported: off, on, auto
        output_csc: bypass 
            supported: bypass, tvrgb, ycbcr601, ycbcr709
        scaling mode: None 
            supported: None, Full, Center, Full aspect
        load detection: 1 
            range: (0, 1)
        link-status: Good 
            supported: Good, Bad
        CONNECTOR_ID: 54 
            supported: 54
        non-desktop: 0 
            range: (0, 1)
      1024x768 (0x56) 65.000MHz -HSync -VSync *current
            h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
            v: height  768 start  771 end  777 total  806           clock  60.00Hz
      800x600 (0x57) 40.000MHz +HSync +VSync
            h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
            v: height  600 start  601 end  605 total  628           clock  60.32Hz
      800x600 (0x58) 36.000MHz +HSync +VSync
            h: width   800 start  824 end  896 total 1024 skew    0 clock  35.16KHz
            v: height  600 start  601 end  603 total  625           clock  56.25Hz
      848x480 (0x59) 33.750MHz +HSync +VSync
            h: width   848 start  864 end  976 total 1088 skew    0 clock  31.02KHz
            v: height  480 start  486 end  494 total  517           clock  60.00Hz
      640x480 (0x5a) 25.175MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
            v: height  480 start  490 end  492 total  525           clock  59.94Hz
    VGA-1-1 connected 1600x900+1024+0 (0x7d) normal (normal left inverted right x axis y axis) 527mm x 296mm
        Identifier: 0x7b
        Timestamp:  119801
        Subpixel:   unknown
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:    
        CRTC:       4
        CRTCs:      4 5
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        _MUTTER_PRESENTATION_OUTPUT: 0 
        EDID: 
            00ffffffffffff0004727f053d4a8011
            121f010368351e78ee0565a756529c27
            0f5054b30c00714f818081c081009500
            b300d1c00101023a801871382d40582c
            45000f282100001e000000fd00384b1f
            4b12000a202020202020000000fc0053
            41323430590a202020202020000000ff
            005439325349303032323433300a005b
        PRIME Synchronization: 0 
            supported: 0, 1
        link-status: Good 
            supported: Good, Bad
        CTM: 420160213 1 390610691 -2147483648 68657360 -2147483648 4394435 0 -7568605 0 12152591 0 51151133 0 163963301 0 
            -202741000 0 
        CONNECTOR_ID: 61 
            supported: 61
        non-desktop: 0 
            range: (0, 1)
      1600x900_60.00 (0x7d) 118.250MHz -HSync +VSync *current +preferred
            h: width  1600 start 1696 end 1856 total 2112 skew    0 clock  55.99KHz
            v: height  900 start  903 end  908 total  934           clock  59.95Hz
      1920x1080 (0x7e) 148.500MHz +HSync +VSync +preferred
            h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.50KHz
            v: height 1080 start 1084 end 1089 total 1125           clock  60.00Hz
      1680x1050 (0x7f) 146.250MHz -HSync +VSync
            h: width  1680 start 1784 end 1960 total 2240 skew    0 clock  65.29KHz
            v: height 1050 start 1053 end 1059 total 1089           clock  59.95Hz
      1280x1024 (0x80) 108.000MHz +HSync +VSync
            h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
            v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
      1440x900 (0x81) 106.500MHz -HSync +VSync
            h: width  1440 start 1520 end 1672 total 1904 skew    0 clock  55.93KHz
            v: height  900 start  903 end  909 total  934           clock  59.89Hz
      1280x800 (0x82) 83.500MHz -HSync +VSync
            h: width  1280 start 1352 end 1480 total 1680 skew    0 clock  49.70KHz
            v: height  800 start  803 end  809 total  831           clock  59.81Hz
      1152x864 (0x83) 108.000MHz +HSync +VSync
            h: width  1152 start 1216 end 1344 total 1600 skew    0 clock  67.50KHz
            v: height  864 start  865 end  868 total  900           clock  75.00Hz
      1280x720 (0x84) 74.250MHz +HSync +VSync
            h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  45.00KHz
            v: height  720 start  725 end  730 total  750           clock  60.00Hz
      1024x768 (0x85) 75.000MHz -HSync -VSync
            h: width  1024 start 1048 end 1184 total 1328 skew    0 clock  56.48KHz
            v: height  768 start  771 end  777 total  806           clock  70.07Hz
      1024x768 (0x56) 65.000MHz -HSync -VSync
            h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
            v: height  768 start  771 end  777 total  806           clock  60.00Hz
      800x600 (0x57) 40.000MHz +HSync +VSync
            h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
            v: height  600 start  601 end  605 total  628           clock  60.32Hz
      800x600 (0x58) 36.000MHz +HSync +VSync
            h: width   800 start  824 end  896 total 1024 skew    0 clock  35.16KHz
            v: height  600 start  601 end  603 total  625           clock  56.25Hz
      640x480 (0x86) 30.240MHz -HSync -VSync
            h: width   640 start  704 end  768 total  864 skew    0 clock  35.00KHz
            v: height  480 start  483 end  486 total  525           clock  66.67Hz
      640x480 (0x5a) 25.175MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
            v: height  480 start  490 end  492 total  525           clock  59.94Hz
      720x400 (0x87) 28.320MHz -HSync +VSync
            h: width   720 start  738 end  846 total  900 skew    0 clock  31.47KHz
            v: height  400 start  412 end  414 total  449           clock  70.08Hz
      1024x768 (0x56) 65.000MHz -HSync -VSync
            h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
            v: height  768 start  771 end  777 total  806           clock  60.00Hz
      800x600 (0x57) 40.000MHz +HSync +VSync
            h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
            v: height  600 start  601 end  605 total  628           clock  60.32Hz
      800x600 (0x58) 36.000MHz +HSync +VSync
            h: width   800 start  824 end  896 total 1024 skew    0 clock  35.16KHz
            v: height  600 start  601 end  603 total  625           clock  56.25Hz
      640x480 (0x5a) 25.175MHz -HSync -VSync
            h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
            v: height  480 start  490 end  492 total  525           clock  59.94Hz
    sundaram@mks:~$ 
    
    
    
    
    The result of post #10 Option 2:
    sundaram@mks:~$ xrandr --listmonitors
    Monitors: 2
     0: +*VGA-1 1024/271x768/203+0+0  VGA-1
     1: +VGA-1-1 1600/527x900/296+1024+0  VGA-1-1
    sundaram@mks:~$
    Last edited by mksundaram2; May 19th, 2023 at 11:31 AM.

  9. #19
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    VGA-1-1 is your Acer display and it's EDID table is being seen. VGA-1 is your LG display, and it's EDID table is not being seen.

    Before you do anything else, let's keep you out of trouble with the Moderators here... This Forum's policy is that User's wrap all comands and Raw output with CODE Tags. Please go back to your last post, selct "Edit Post" > "Advanced" ... Then selct the text of the output with your muse, to highlight it. Then select the "#" Icon from the editor menu. That will wrap all that is selected with CODE Tags. Save the edit.

    Now go to Post #17 and try the 'xrandr' commands and see if they work for you...

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  10. #20
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    Re: Issue with Second Display Monitor (Unknown Display) and Missing 1600x900 Resoluti

    From post #5
    This should give you all the information both of your displays give your PC about themselves. If your second display isn't shown in the output then either the VGA cable doesn't have all pins connected - specifically it would be missing three pins for the Display Data Channel - or the VGA connector on your graphics card doesn't implement DDC.

    I swapped the vga cables and now LG Monitor is shown and acer is shown as unknown display and more over the LG now has 1600x900 and acer, unknow display, has maximum 1600x900. it should have 1920x1080 or more.

    So I feel there must be issue with the vga cable. I would change it and revert. Thanks

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