Thank you for your bug report. Bug 88935 seems to have the same problem, so I am confirming this as a known problem.
If you can please attach a copy of the following command that will help.
lspci -vv
** Changed in: xorg (Ubuntu)
Importance: Undecided => Low
Status: Unconfirmed => Confirmed
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regression: firefox, liferea, epiphany cause xorg to peg CPU usage (ati)
https://launchpad.net/bugs/88568
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