Daniel, does the problem exists for you, too if you use the 'radeonhd' driver 
instead of 'radeon'?
There is no other way than filing a bug report upstream :D
I can do that for you if you don't want to do that, but you have to provide 
logs and so on if it's necessary.
Shall I file the bug report for you?

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[RS690M] screen randomly blanks for short times
https://bugs.launchpad.net/bugs/310864
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