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

[Dimitri John Ledkov]

ubiquity-dm opens up a PAM session and specifically sets logind variables to open a "greeter session" (seat0).
please check with loginctl that a correct logind session is opened for ubiquity-dm.
if there is logind session opened, further debugging will be required to figure why /dev/dri is not available / not tagged for seat0.

** Changed in: ubiquity (Ubuntu)
       Status: New => Incomplete

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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

Status in “ubiquity” package in Ubuntu:
  Incomplete

Bug description:
  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.

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