Now I found out the problem. DRI is not being used due to lack of
permissions for the second seat. This happens even though I have
Section "DRI"
Mode 0666
EndSection
in my xorg.conf file.
It looks like console kit is defining the permissions of
/dev/dri/card[0-1]. It is readable and writable only by root (the owner)
and the group 'video'. The users in my system do not belong to the
group video but some how the user using the first seat can use DRI since
this is the session marked as active by console kit. The second session
is marked inactive and the user is not granted permission to use DRI.
As I workaround I added my users (they are just a few) to the 'video'
group. I have now a fully working two seat system. I suggest that this
bug should be marked as invalid if my finding can be reproduced as it is
actually a bug related to permissions controlled by console kit. Maybe
it is a bug in console kit itself, but not a unity bug.
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https://bugs.launchpad.net/bugs/883225
Title:
Unity looks strange when used in multiseat setup
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