Wayland session does not work with seat1

Bug #1661343 reported by Alberts Muktupāvels
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Light Display Manager
New
Undecided
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Bug Description

LightDM fails to start wayland session on seat1.

GNOME Shell / Mutter fails with error:
Can't initialize KMS backend: Could not open DRM device: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Invalid argument

Invalid argument in this case is EINVAL from open("/dev/dri/card1", ...) call.

If seat1 is configured to autologin it works.

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