Minor success. I've made a test available that you can use to replicate the bug 
using a desktop:
https://git.launchpad.net/~xmir-team/xorg-server/+git/xmir/commit/?id=637f0971b191c9fbdc459f3fdb7ba5bc479b84be

So this shows the problem is triggered by the priority order of
supported pixel formats the Android platform returns. Mir's Android
platform is returning the correct values in the correct order, but it's
different to desktops, and that's enough to trigger this bug in Xorg.

It remains to be seen if the problem is an issue in Xorg that's always
been there, or just something that Xmir is failing to initialize
correctly.

Mir's Android graphics platform unfortunately does not support the same
pixel formats as desktop that would avoid this bug. However adding
ShmBuffer support to the Android platform would allow it to support all
such pixel formats (and solve other bugs like the corruption issues).

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https://bugs.launchpad.net/bugs/1573470

Title:
  BQ M10 tablet. Libreoffice Impress display wrong colors

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