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I have a webos tv that support both Intel Wireless Display and miracast.

I want the tv screen to extend my desktop monitor like with xinerama : that is, I don’t want the tv to mirror the image of my desktop monitor (the main reason is the tv has a wider resolution as well as an higher possible refresh rate).

I found only MiracleCast, unfortunately, it only allows screen mirroring.

Update

For those who don’t have an idea of what Xinerama is :

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  • I'm afraid you are out of luck in Debian. On Windows 8.1/10, Mac and Android this is easy. For Linux you might try to compile and use aethercast - good luck on that. A smart TV can receive video via DLNA or even stream the desktop, but this is not what you want. The only real solution I can see is to extend an HDMI cable from the computer to the TV.
    – harrymc
    Jan 13 '17 at 21:30
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    @harrymc : aethercast is a D‑bus api, not a program. I asked the question on superuser, not on stackoverflow. There’s no way to put the computer and the television on the same stair. A least do you think such question should receive upvotes ? Jan 14 '17 at 21:13
  • HDMI can be cabled over 10-15 meters without problem. With additional hardware much more can be achieved (one link among many) or over LAN (possible example) or even over powerline. I have no experience with this, so cannot recommend a product. If you like some such idea you will need to do the research yourself.
    – harrymc
    Jan 14 '17 at 22:35
  • @harrymc : I would say 20 or 30 meters (it is for the same reason I can’t use ethernet for Internet access). But since hdmi over ip is possible, why not hdmi over 300mps wi‑fi ? I also can’t use powerline for data because it is already used by the electricity provider. Remember I’m not really ok to pay for something which would free on Windows beta. Jan 14 '17 at 22:47
  • 1
    @harrymc : no, technically, it’s about sending a video signal over a peer to peer wif‑fi connection. Jan 15 '17 at 17:39
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To summarize my discussion with the poster :

While using TV as an extended desktop is easy for Windows 8.1/10, Mac and Android, it is not that easy on Linux.

Below are some directions you could follow :

  • Connect the TV to the computer via HDMI, using one of the numerous hardware solutions for HDMI extender cables (example), or HDMI over IP (example) or over Wireless. These solutions can extend reception up to more than a hundred meters.
  • Connect your tablet as secondary monitor and cast it to the TV. Numerous sources exist for this and here is one random link.

These all require new hardware to be bought. As you know best your budget and physical constraints, you will need to do the required research and decide. If you have good electronics shops in your area, choose one that allows returns, or use Amazon, so you could backtrack.

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