What appears to be happening is the greeter is not aware it is running
inside Unity System Compositor and so it trying to directly access the
video drivers. This fails because it is not running as root.
The cause seems to be LightDM is setting MIR_SOCKET to the name of the
U-S-C socket but this no longer works (possibly due to a change in bug
1290345).
The solution is to set MIR_SERVER_HOST_SOCKET instead, which is the
recommended/correct variable to tell a Mir server the socket of the
parent server (U-S-C in this case) to connect to.
** Also affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Changed in: lightdm
Importance: Undecided => High
** Changed in: lightdm (Ubuntu)
Importance: Undecided => High
** Changed in: lightdm (Ubuntu)
Assignee: (unassigned) => Robert Ancell (robert-ancell)
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https://bugs.launchpad.net/bugs/1583624
Title:
Mir cannot open a tty when started by lightdm
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