This sounds a lot like a kernel issue; I'll add them to take a look.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided => Medium
Status: Confirmed => Triaged
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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[M6] laptop freezes when connecting power supply
https://bugs.launchpad.net/bugs/146303
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