The solution proposed by Steve in comment #6 works for me too (my
processor is AMD Phenom 9500 and I was affected by this bug)
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https://bugs.launchpad.net/bugs/1779092
Title:
** Also affects: gdm
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1766137
Title:
[regression] Password accepted but login fails (blank purple screen