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Every time I log out of my session, gdm moves to a different DISPLAY variable. Judging from /var/log/gdm, it rotates between :0 and :5.

I'm finding no documentation on this logic. How do I keep gdm on :0?

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This behavior is different on gdm-3.16. Now a gdm instance always active on vt1. – lkraav Oct 2 '15 at 12:12

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