[Solved] MST support (Two monitors on a single DisplayPort cable)

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exetico
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Posts: 9
Joined: Sat Apr 14, 2018 5:43 am

[Solved] MST support (Two monitors on a single DisplayPort cable)

Post by exetico » Wed Apr 25, 2018 7:52 am

Hi all,

I'm trying to use both my Dell U2515H with a single DisplayPort cable (using MST aka. Multi Stream Transport). The setup works just fine in Windows 10 (I'm not happy to say that!) with MST support.

I'm on a GeForce GTX 1050 Ti, and a tried a lot of things with the NVIDIA X Server Settings, and the build in options in Linux Mint, but everytime a change thing, it's just a question about which of the monitors will show up.
DP-0.8 is my left monitor (first, and primary)
DP-1.0 is my right monitor (secound)

The "Mirror" option in "Display" doesn't do anything - Only one of the displays shows up with the desktop. The other one just enter standby-mode.

xrandr gives me:

Code: Select all

Screen 0: minimum 8 x 8, current 5120 x 1440, maximum 32767 x 32767
DP-0.8 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 553mm x 311mm
   2560x1440     59.95*+
   2048x1152     60.00  
   1920x1200     59.88  
   1920x1080     60.00    59.94    50.00    29.97    25.00    23.97    60.05    60.00    50.04  
   1680x1050     59.95  
   1600x1200     60.00  
   1280x1024     75.02    60.02  
   1280x720      60.00    59.94    50.00  
   1200x960      59.90  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-0.1 connected 2560x1440+2560+0 (normal left inverted right x axis y axis) 553mm x 311mm
   2560x1440     59.95*+
   2048x1152     60.00  
   1920x1200     59.88  
   1920x1080     60.00    59.94    50.00    29.97    25.00    23.97    60.05    60.00    50.04  
   1680x1050     59.95  
   1600x1200     60.00  
   1280x1024     75.02    60.02  
   1280x720      60.00    59.94    50.00  
   1200x960      59.90  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
And inxi -Fxz gives me:

Code: Select all

inxi -Fxz
System:    Host: linuxmint Kernel: 4.10.0-38-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: Cinnamon 3.6.7 (Gtk 3.18.9-1ubuntu3.3) Distro: Linux Mint 18.3 Sylvia
Machine:   Mobo: Gigabyte model: Z97N-WIFI v: x.x Bios: American Megatrends v: F7 date: 09/18/2015
CPU:       Quad core Intel Core i5-4690K (-MCP-) cache: 6144 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 28002
           clock speeds: max: 3900 MHz 1: 3646 MHz 2: 3887 MHz 3: 3899 MHz 4: 3889 MHz
Graphics:  Card: NVIDIA Device 1c82 bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 drivers: nvidia (unloaded: fbdev,vesa,nouveau)
           Resolution: 2560x1440@59.95hz, 2560x1440@59.95hz
           GLX Renderer: GeForce GTX 1050 Ti/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 378.13 Direct Rendering: Yes
Audio:     Card-1 NVIDIA Device 0fb9 driver: snd_hda_intel bus-ID: 01:00.1 Sound: ALSA v: k4.10.0-38-generic
           Card-2 Intel 9 Series Family HD Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
Network:   Card-1: Intel Ethernet Connection I217-V driver: e1000e v: 3.2.6-k port: f040 bus-ID: 00:19.0
           IF: eno1 state: down mac: <filter>
           Card-2: Qualcomm Atheros AR8161 Gigabit Ethernet driver: alx port: d000 bus-ID: 03:00.0
           IF: enp3s0 state: down mac: <filter>
           Card-3: Intel Wireless 7260 driver: iwlwifi bus-ID: 04:00.0
           IF: wlp4s0 state: up mac: <filter>
Drives:    {removed}
Partition: {removed}
RAID:      {removed}
Sensors:   System Temperatures: cpu: 29.8C mobo: 27.8C gpu: 0.0:56C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 304 Uptime: 3:31 Memory: 8697.8/15949.1MB Init: systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.481) inxi: 2.2.35 
I saw that a few asked other persons to run udevadm monitor, but when i remove my DP cable and plug it back in, only the USB-interface pops up.

Code: Select all

sudo udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[12941.560867] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4/4-6.3.4:1.0 (usb)
KERNEL[12941.561614] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4 (usb)
KERNEL[12941.561641] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3:1.0 (usb)
UDEV  [12941.561662] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4/4-6.3.4:1.0 (usb)
KERNEL[12941.561990] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3 (usb)
UDEV  [12941.562008] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3:1.0 (usb)
UDEV  [12941.564302] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4 (usb)
UDEV  [12941.566784] remove   /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3 (usb)
KERNEL[12941.668267] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4/3-10.3.4:1.0 (usb)
KERNEL[12941.668859] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4 (usb)
KERNEL[12941.668882] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3:1.0 (usb)
UDEV  [12941.669105] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4/3-10.3.4:1.0 (usb)
KERNEL[12941.669308] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3 (usb)
UDEV  [12941.669510] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3:1.0 (usb)
UDEV  [12941.672291] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4 (usb)
UDEV  [12941.675014] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3 (usb)
KERNEL[12948.860383] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3 (usb)
KERNEL[12948.861374] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3:1.0 (usb)
KERNEL[12949.041358] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3 (usb)
KERNEL[12949.041385] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3:1.0 (usb)
UDEV  [12949.048945] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3 (usb)
UDEV  [12949.049977] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3:1.0 (usb)
UDEV  [12949.051961] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3 (usb)
UDEV  [12949.052590] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3:1.0 (usb)
KERNEL[12949.168381] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4 (usb)
KERNEL[12949.169112] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4/4-6.3.4:1.0 (usb)
UDEV  [12949.175035] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4 (usb)
UDEV  [12949.179114] add      /devices/pci0000:00/0000:00:14.0/usb4/4-6/4-6.3/4-6.3.4/4-6.3.4:1.0 (usb)
KERNEL[12949.428831] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4 (usb)
KERNEL[12949.429141] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4/3-10.3.4:1.0 (usb)
UDEV  [12949.436346] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4 (usb)
UDEV  [12949.437330] add      /devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10.3/3-10.3.4/3-10.3.4:1.0 (usb)
Image
Last edited by exetico on Tue May 01, 2018 12:04 pm, edited 1 time in total.

exetico
Level 1
Level 1
Posts: 9
Joined: Sat Apr 14, 2018 5:43 am

[Solved] Re: MST support (Two monitors on a single DisplayPort cable)

Post by exetico » Tue May 01, 2018 11:57 am

After trying some other search terms, i managed to get both monitors working, after reading this post on StackExchange's Ubuntu-section, totymedli also linking to this post about monitors stuck in sleep mode.

I just used this command: xset dpms force off, and moved my mouse a bit.

I'm still open for discussion, but i'm not sure if that makes any sense here. Take a look at the links! :-)

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