Dual Screen not working

balance · 2017-02-21 22:52:51

Hi everyone

I'm using Arch with Enlightenment on a ThinkPad Yoga. I'm currently testing my OneLink Pro Dock. It has a DVI Output. It seems to regocnize the DVI Port of the Dual Screen but the external screen says it doesn't get a signal.

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 276mm x 156mm panning 1920x1080+0+0
   1920x1080     60.04*+
   1400x1050     59.98
   1280x1024     60.02
   1280x960      60.00
   1024x768      60.04    60.00
   960x720       60.00
   928x696       60.05
   896x672       60.01
   800x600       60.00    60.32    56.25
   700x525       59.98
   640x512       60.02
   640x480       60.00    59.94
   512x384       60.00
   400x300       60.32    56.34
   320x240       60.05
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1-1 connected (normal left inverted right x axis y axis)
   1920x1200     59.95 +
   1680x1050     59.88
   1280x1024     75.02
   1440x900      59.90
   1280x960      60.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 disconnected (normal left inverted right x axis y axis)

What's wrong here?

seth · 2017-02-22 09:02:59

DP-1-1 is disabled

xrandr --output DP-1-1 --auto
man xrandr

balance · 2017-02-22 10:33:29

THanks, now it works. May I ask where you saw that it was disabled? And what all the others DP are? Also it seems that I have to run that command each time I plug the dock in, so I'm wondering how I can automate this.

How can I detect that I plugged in the dock?

Will of course read about xrandr t set up everything more nicely.

imdn · 2017-02-22 11:15:01

balance wrote:

Also it seems that I have to run that command each time I plug the dock in, so I'm wondering how I can automate this.
How can I detect that I plugged in the dock?

I've been search for a good solution myself and there is no easy way to automate this.

Autorandr is one option (https://github.com/wertarbyte/autorandr). However, this still requires you to manually run the command each time you dock/undock.

Whenever you dock, new peripherals/ports show up that are visible via lspci. You will need to write a udev rule whenever you detect one of these (see https://wiki.archlinux.org/index.php/Udev). These rules can call a script that runs whenever a device is added/removed.

But here's the catch. You cannot call xrandr in the udev script because of X11's latency. Udev will run the script immediately upon docking, but Xrandr will not yet recognize the secondary monitor at this stage. My hack involves this:

- Write a udev rule that runs a script upon docking. Let's call it foo_udev.sh
- foo_udev.sh simply writes to a temp file
- Use file-inotify to run a script foo_dock.sh whenever it detects changes to the temp file
- foo_dock.sh runs xrandr and whatever else you need when you dock

I did something similar to remap mouse buttons when a usb mouse is plugged in. Take a look at the solution here https://bbs.archlinux.org/viewtopic.php … 5#p1626055. You will need to make the necessary modifications when docking.

balance · 2017-02-22 11:31:25

okay thanks for that info Lucky the dock isn't important at the moment. Will try to get it working and might post again if something nice shows up

seth · 2017-02-22 12:27:30

https://keithp.com/blogs/x-on-resize/
Package: https://aur.archlinux.org/packages/x-on-resize/

DP-1-1 is only connected, but has no resolution assigned. Also the current mode is tagged with an asterisk.

Display Port provides a main link (DP-1) with 4 lanes which allow you to daisy chain outputs.

Arch Linux

#1 2017-02-21 22:52:51

Dual Screen not working

#2 2017-02-22 09:02:59

Re: Dual Screen not working

#3 2017-02-22 10:33:29

Re: Dual Screen not working

#4 2017-02-22 11:15:01

Re: Dual Screen not working

#5 2017-02-22 11:31:25

Re: Dual Screen not working

#6 2017-02-22 12:27:30

Re: Dual Screen not working

Board footer