I think it would be wise to report this upstream.
Look here, how this is to be done:
https://wiki.ubuntu.com/Bugs/Upstream/Freedesktop
Thanks.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Confirmed
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[RS690M] screen randomly blanks for short times
https://bugs.launchpad.net/bugs/310864
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