broken colors after suspend/resume (iMac 8,1)

Submitted by Lorenzo

Assigned to xf86-video-ati maintainers

Link to original bug (#90843)

Description

OS: ubuntu 14.04 on a iMac 2008
Video card: ATI Radeon HD 2600
Problem: after a suspend/resume, the graphics are broken (here there is an image: https://onedrive.live.com/redir?resid=F360DB4014F86298!22188&authkey=!AISDvz3fV20MHKI&v=3&ithint=photo%2cjpg)
I don't know if is the same problem but when I boot the system I receive this message:
radeon 0000:01:00.0: Invalid ROM contents