[Bug 1261251] [NEW] ubiquity-dm doesn't have access to /dev/dri because of missing loginctl session

[Harald Sitter]

Public bug reported:

as apparently ubiquity-dm does not have a proper loginctl session set up
it does not have access to /dev/dri.

generally speaking this means that a ubiquity UI couldn't do fancy
opengl nonesense. which may indeed happen at some point if either ubuntu
or kubuntu switches the UI to QML2/Qt5.

more specifically and in the right now: in case of kubuntu the permission issue makes KWin's GL support detection code fall back to llvmpipe which then makes KWin force Xrender effects rendering rather than OpenGL. this setting is written to a config file so kwin doesn't need to check again.
if the user then chooses to 'Try Kubuntu' the newly started session actually has access to /dev/dri but will still use xrender as per previous detection.

without a proper session every !ubiquity piece of softwared used runs
risk of having reduced feature availability.

** Affects: ubiquity (Ubuntu)
     Importance: Low
         Status: New


** Tags: kubuntu

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https://bugs.launchpad.net/bugs/1261251

Title:
  ubiquity-dm doesn't have access to /dev/dri because of missing
  loginctl session

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