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Is there no way to do this without a physical plug? I think there's a way to make dummy X.org display devices without any extra physical hardware -- I've defin

Is there no way to do this without a physical plug? I think there's a way to make dummy X.org display devices without any extra physical hardware -- I've definitely done similar stuff when setting up headless automated E2E testing, before tools for this were widely available. Is the hard part connecting it to an existing session as a display? Or is it that cross-platform compatibility is what's holding it back, since perhaps there is no equivalent for people running a macOS or Windows based OS? All that said, this looks super cool! Congrats and thanks for sharing! I'm tempted to give it a shot. My current set-up is similar except I use Barrier to share my mouse and keyboard across 4 cheap (<$200) laptops I've accumulated over the last few years.

pavlobu 6y ago
Hi thanks on paying attention on that, Yes it is a problem of cross-platform support. Each os with its own zoo of tricks and tweaks. So for each os there should be a separate module, basically 3 different projects that then can be used as native modules for Deskreen. I'll just repost my previous answer. >Yes, Both linux and mac have x servers running. But different >variations of them. There is no problem with Linux at all, it >is all customizable and user can be just asked to restart a >computer to rewrite x server configs. >But on mac and windows this is a quite different situation. Cheers
- GekkePrutser 6y ago
  On Mac the X server is only optional though (Xquartz) and I don't think it can even 'see' the entire screen. Only other X Windows apps.
- michaelpb 6y ago
  Gotcha! Thanks for the reply, and thanks again for the project. > So for each os there should be a separate module, basically 3 different projects that then can be used as native modules for Deskreen. I hope more folks contribute to improving each of the different modules. I personally would dive in to work on improving Linux support if I had time, but I'm already very stretched thin, so that will have to wait.
- fblp 6y ago
  Can you gleen anything from how Facebook messenger does screen sharing on Android and iOS?
  - pavlobu 6y ago
    I don't know but it may be WebRTC behind it as well.
- reidacdc 6y ago
  Thanks for this question and answer -- I recently learned about both xpra and x2go, and was wondering if this was related, like a generalization of it or something. Now I think maybe this is a good answer for some remote visualization applications.
stragies 6y ago
If your device has an unused VGA connector, then on X11 (perhaps Wayland too) you can "force" the graphics-card into a mode for that output without connecting a VGA dummy plug. That second screen you just export with X11vnc. Using Android Phones/tablets, and USB connections, you can do some little "adb forward" magic, and then push the VNC stream over the USB-connection to a VNC viewer on the Android tables. Run x2vnc to "beam" pointer/HID data to the tablet, for when you are on the external screens with the mouse. Works fine, very low latency, no WIFI required. And it charges your tablet too.
- pavlobu 6y ago
  Wow, sounds great!
- dingdingdang 6y ago
  Any practical guides/info on how to achieve this setup without a dedicated research session?
  - stragies 6y ago
    For Linux, X11, USB-connection to Android-Device(s), and the TV over Network: - Make another screen - 3 options, depending on driver/available_outputs: 1: make a mode with `cvt`, add it with `xrandr --newmode`, bind it to unused output with `--addmode` 2: Use a dummy plug on a free output 3: Use `evdi` and the `example` application in evdipp to create a virtual screen, attach the provider with xrandr - Export the new screen, or a portion of it with `x11vnc`, using the `-clip` option with coordinates or screennumber. Optional: Use `NoVNC` to make VNC available to any HTML5 browser - use adb port forwarding commands to forward localhost:whatever1 on the Android device to connect to the X11VNC port. - Use ADB, or your finger to start VNC session on tablet to localhost:whatever1, and UPNP/whatever to start browser on TV for NoVNC url. That should cut down your research time ;) Be warned, Evdi&EvdiPP are currently still glitchy, but under active development. https://github.com/mlukaszek/evdipp https://github.com/mlukaszek/evdipp
    - dingdingdang 6y ago

pavlobu 6y ago

Hi thanks on paying attention on that, Yes it is a problem of cross-platform support. Each os with its own zoo of tricks and tweaks. So for each os there should be a separate module, basically 3 different projects that then can be used as native modules for Deskreen. I'll just repost my previous answer. >Yes, Both linux and mac have x servers running. But different >variations of them. There is no problem with Linux at all, it >is all customizable and user can be just asked to restart a >computer to rewrite x server configs. >But on mac and windows this is a quite different situation. Cheers

GekkePrutser 6y ago
On Mac the X server is only optional though (Xquartz) and I don't think it can even 'see' the entire screen. Only other X Windows apps.
michaelpb 6y ago
Gotcha! Thanks for the reply, and thanks again for the project. > So for each os there should be a separate module, basically 3 different projects that then can be used as native modules for Deskreen. I hope more folks contribute to improving each of the different modules. I personally would dive in to work on improving Linux support if I had time, but I'm already very stretched thin, so that will have to wait.
fblp 6y ago
Can you gleen anything from how Facebook messenger does screen sharing on Android and iOS?
- pavlobu 6y ago
  I don't know but it may be WebRTC behind it as well.
reidacdc 6y ago
Thanks for this question and answer -- I recently learned about both xpra and x2go, and was wondering if this was related, like a generalization of it or something. Now I think maybe this is a good answer for some remote visualization applications.

stragies 6y ago

If your device has an unused VGA connector, then on X11 (perhaps Wayland too) you can "force" the graphics-card into a mode for that output without connecting a VGA dummy plug. That second screen you just export with X11vnc. Using Android Phones/tablets, and USB connections, you can do some little "adb forward" magic, and then push the VNC stream over the USB-connection to a VNC viewer on the Android tables. Run x2vnc to "beam" pointer/HID data to the tablet, for when you are on the external screens with the mouse. Works fine, very low latency, no WIFI required. And it charges your tablet too.

pavlobu 6y ago
Wow, sounds great!
dingdingdang 6y ago
Any practical guides/info on how to achieve this setup without a dedicated research session?
- stragies 6y ago
  For Linux, X11, USB-connection to Android-Device(s), and the TV over Network: - Make another screen - 3 options, depending on driver/available_outputs: 1: make a mode with `cvt`, add it with `xrandr --newmode`, bind it to unused output with `--addmode` 2: Use a dummy plug on a free output 3: Use `evdi` and the `example` application in evdipp to create a virtual screen, attach the provider with xrandr - Export the new screen, or a portion of it with `x11vnc`, using the `-clip` option with coordinates or screennumber. Optional: Use `NoVNC` to make VNC available to any HTML5 browser - use adb port forwarding commands to forward localhost:whatever1 on the Android device to connect to the X11VNC port. - Use ADB, or your finger to start VNC session on tablet to localhost:whatever1, and UPNP/whatever to start browser on TV for NoVNC url. That should cut down your research time ;) Be warned, Evdi&EvdiPP are currently still glitchy, but under active development. https://github.com/mlukaszek/evdipp https://github.com/mlukaszek/evdipp
  - dingdingdang 6y ago