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I want to use my android phone (LG G3) as a second screen for my laptop. My laptop dual boots Linux(Xubuntu) and Windows(8.1), so an application that is running on either of those is fine.

Requirements:

  • Must work with android PHONE. Not tablet.
  • Must support "extend" mode. (I mean this) (I don't know if Linux has it)
  • Must be free. (No trial time or anything, just fully free)

I don't care about:

  • Whether it's wireless or wired, both options are OK. (I don't really care about lag or resolution)
  • Whether it runs on Linux or Windows. (Not Mac!)

Nice-to-have:

  • If on Linux, an option to assign a specific workspace to the phone, and others stay on the laptop's screen. (From Xfce4, if that matters)

Also, I heard some stuff about Linux's X-servers, maybe that can make it simpler or something? Maybe an x-client for android phone?

EDIT: Tried DimP's response here, moving the mouse out of the screen works like expected, however dragging the window just changes it to another workspace... Tried doing both -south and -north so that xfce doesn't care about workspaces, but panels "block" the movement... And I think that there must be a better way...

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  • Here is a solution using a VNC server. I have not tried it myself. – DimP Jun 21 '16 at 15:52
  • @DimP It works and the mouse behaves like in "extend" mode, but I can't understand how to move a window to the other screen... I used askubuntu.com/a/306741/503298 answer. – Amit Gold Jun 22 '16 at 7:46
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    Do you mind installing an alternative OS on your phone? (I don't have an idea, but just to know) – arieljannai Jul 1 '18 at 17:50
  • 3 and a half years late to the party. spacedesk.net is exactly what you wanted for Windows – Killbunny Jan 7 '20 at 22:39
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You might wish to take a look at spacedesk:

  • supports Windows (8.1 and 10; requires a Windows companion app)
  • supports phone as well as tablet
  • works with extended mode as well as mirror mode
  • is listed as "free" (and comes without trackers)

For Linux, indeed an X-Server might be an option. Take a look at

Not sure how they work as extension (to be dealt with the computer mouse directly), as I haven't tried that.

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