Coding,  mir,  Ubuntu

New Mir Release (0.18)

Mir Image

If a new Mir release was on your Christmas wishlist (like it was on mine), Mir 0.18 has been released! I’ve been working on this the last few days, and its out the door now.  Full text of changelog. Special thanks to mir team members who helped with testing, and the devs in #ubuntu-ci-eng for helping move the release along.


  • Internal preparation work needed for Vulkan, hardware decoded multimedia optimizations, and latency improvements for nested servers.
  • Started work on plugin renderers. This will better prepare mir for IoT, where we might not have a Vulkan/GLES stack on the device, and might have to use the CPU.
  • Fixes for graphics corruption affecting Xmir (blocky black bars)
  • Various fixes for multimonitor scenarios, as well as better support for scaling buffers to suit the the monitor its on.


  • Use libinput by default. We had been leaning on an old version of the Android input stack. Completely remove this in favor of using libinput.


  • Quite a long list of bug correction. Some of these were never ‘in the wild’ but existed in the course of 0.18 development.

What’s next?

Its always tricky to pin down what exactly will make it into the next release, but I can at least comment on the stuff we’re working on, in addition to the normal rounds of bugfixing and test improvements:

  • various Internet-o-Things and convergence topics (eg, snappy, figuring out different rendering options on smaller devices).
  • buffer swapping rework to accommodate different render technologies (Vulkan!) accommodations for multimedia, and improve latency for nested servers.
  • more flexible screenshotting support
  • further refinements to our window management API
  • refinements to our platform autodetection

How can I help?

Writing new Shells

A fun way to help would be to write new shells! Part of mir’s goals is to make this as easy to do as possible, so writing a new shell always helps us make sure we’re hitting this goals.

If you’re interested in the mir C++ shell API, then you can look at some of our demos, available in the ‘mir-demos’ package. (source here, documentation here)

Even easier than that might be writing a shell using QML like unity8 is doing via the qtmir plugin. An example of how to do that is here (instructions on running here).

Tinkering with technology

If you’re more of the nuts and bolts type, you can try porting a device, adding a new rendering platform to mir (OpenVG or pixman might be an interesting, beneficial challenge), or figuring out other features to take advantage of.

Standard stuff

Pretty much all open source projects recommend bug fixing or triaging, helping on irc (#ubuntu-mir on freenode) or documentation auditing as other good ways to start helping.


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