Arch Linux

Gazp

Member

Registered: 2015-07-28

Posts: 2

3 monitors 2 GPUs and Nvidia base mosaic mode

Hi All,

I have just reinstalled Arch on my desktop, but for some reason I can not get all three monitors to work (before I reinstalled I had them all working w/ Arch).

So far I have installed nvidia mesa & xfce4

I have 2 GPUs

GPU 0 - GeForce GTX 470

GPU 1 - GeForce GTX 650 Ti

The GTX 470 has two monitors plugged into it and both those monitors currently work. The 650 has one monitor that is plugged into it and that monitor is currently disabled.

I open Nvidia X server settings, click advanced, I check "Enable Base Mosaic", click on the disabled monitor, change configuration from Disabled to X screen 0. At this point the Nvidia X Server settings show the exact config I want so I click apply. When I click apply I get this message:

Cannot Apply
The current settings cannot be completely applied due to one or more of the following reasons:

-The location of an X screen has changed.
-The location type of an X screen has changed.
-The color depth of an X screen has changed.
-An X screen has been added or removed.
-Xinerama is being enabled/disabled.

For all the requested settings to take effect, you must save the configuration to the X config file and restart the X server.

Apply what is possible OR cancel

I click apply what is possible and nothing happens. I then click Save X config and save it to /etc/X11/xorg.conf. I reboot and when I log in and start xfce4 I still only have two monitors working. The third still shows up as disabled.

cat /X11/xorg.conf
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 352.21  (buildmeister@swio-display-x64-rhel04-13)  Tue Jun  9 22:42:41 PDT 2015

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Ancor Communications Inc VS248"
    HorizSync       30.0 - 83.0
    VertRefresh     50.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 470"
    BusID          "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "GPU-cfb50aaa-12dc-f40f-fac3-4b0752a034ea.DVI-I-2: nvidia-auto-select +0+0, GPU-cfb50aaa-12dc-f40f-fac3-4b0752a034ea.DVI-I-3: nvidia-auto-select +1920+0, GPU-72d84f35-3b2a-4830-4596-ecb24ba0b0e4.DVI-D-0: nvidia-auto-select +3840+0"
    Option         "MultiGPU" "Off"
    Option         "SLI" "off"
    Option         "BaseMosaic" "on"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Any ideas how I can get the third monitor working? I don't remember it being this difficult the last time I setup arch on this computer. Thanks for the help in advance!

Gazp

Member

Registered: 2015-07-28

Posts: 2

Re: 3 monitors 2 GPUs and Nvidia base mosaic mode

Here is the output of /var/log/Xord.0.log

[  1880.853] (**) NVIDIA(0): Option "MetaModes" "GPU-cfb50aaa-12dc-f40f-fac3-4b0752a034ea.DVI-I-2: nvidia-auto-select +0+0, GPU-cfb50aaa-12dc-f40f-fac3-4b0752a034ea.DVI-I-3: nvidia-auto-select +1920+0, GPU-72d84f35-3b2a-4830-4596-ecb24ba0b0e4.DVI-D-0: nvidia-auto-select +3840+0"
[  1880.853] (**) NVIDIA(0): Enabling 2D acceleration
[  1881.382] (EE) NVIDIA(GPU-0): Failed to find a valid Base Mosaic configuration.
[  1881.382] (EE) NVIDIA(GPU-0): Invalid Base Mosaic configuration 1 of 1:
[  1881.382] (EE) NVIDIA(GPU-0): GPUs:
[  1881.382] (EE) NVIDIA(GPU-0):     1) NVIDIA GPU at PCI:1:0:0
[  1881.382] (EE) NVIDIA(GPU-0):     2) NVIDIA GPU at PCI:2:0:0
[  1881.382] (EE) NVIDIA(GPU-0): Errors:
[  1881.382] (EE) NVIDIA(GPU-0):     - The video link was not detected
[  1881.382] (EE) NVIDIA(GPU-0):     - Insufficient PCIe link width
[  1881.382] (EE) NVIDIA(GPU-0):     - GPU PCI IDs do not match
[  1881.382] (WW) NVIDIA(GPU-0): Failed to find a valid Base Mosaic configuration for the
[  1881.382] (WW) NVIDIA(GPU-0):     NVIDIA graphics device PCI:1:0:0. Please see Chapter 28:
[  1881.382] (WW) NVIDIA(GPU-0):     Configuring SLI and Multi-GPU FrameRendering in the README
[  1881.382] (WW) NVIDIA(GPU-0):     for troubleshooting suggestions.