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Multi-Monitor Support Is Not XMir's Only Problem

Ubuntu

Published on 02 October 2013 06:20 PM EDT
Written by Michael Larabel in Ubuntu
23 Comments

Yesterday it was announced that (X)Mir will not be used in Ubuntu 13.10 by default as was originally planned for the desktop Linux distribution updating this month. Cited as a reason was the multi-monitor support not being ready, but there's also several other user-facing issues present in the land of Mir.

One of the Mir issues we had been covering the most -- and one of our biggest gripes with it -- was over performance regressions when adding Mir/XMir to the rendering stack. Fortunately with composite bypass, most of those problems are gone for affecting OpenGL-based games on Ubuntu Linux. There's also numerous other shortcomings with this Canonical display server too.

Besides the multi-monitor support for XMir not being fully primed, Matthew Garrett has conveniently listed several other shortcomings of XMir at this time. Details in full can be found on Matthew's blog but from his eyes other problems include:

- Some systems have display corruption issues due to XMir poking the X.Org (DDX) drivers in different ways than normal.

- The input driver handling still isn't fully secure for the previously-reported XMir input security issue that Canonical tried to resolve.

- XMir doesn't support color profiles.

- RandR properties aren't exposed so users can't control TV output encoding, overscan, and other display attributres.

- There's still no hardware cursor support.

- Other features are still missing.

Matthew Garrett ended his note with, "It's clear that XMir has turned into a larger project than Canonical had originally anticipated, but that's hardly surprising. There's only one developer with previous X experience working on it full-time, and the announced schedule provided no opportunity to deal with unexpected problems. As if that weren't enough, there's obvious conflict between Ubuntu Desktop and Ubuntu Phone when it comes to developer time and required functionality. The one hardware vendor who's willing to take a public stand has demonstrated that they have no interest in supporting XMir, despite Canonical assuring people that they were already engaging in productive negotiations with GPU manufacturers." Matthew additionally suggests as an option Canonical just drop XMir entirely and focus their resources on the Mir-based Unity 8 desktop.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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