This bug seems to be a bad interaction between lightdm and fglrx.
I switched to GDM and now the problem does not happen anymore.
** Also affects: lightdm
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1067320
Title:
1002:6798 [fglrx] VT cursor is visible and blinking on top of Unity
Radeon HD 7970 and 5450
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