Laggy window movement after some time under Kubuntu

[Christian Anke <c.anke@xxxxxxxxxxxxxx>]

Hello,

I've expirienced some laggy window movement with the radeon driver from 
linux 3.15.0
under kubuntu which does not exsist under kubuntu 14.04 (stock linux 
3.13 or or vanilla linux 3.14.7).

Here is my workflow to get the laggy movement:

1. grab a window
2. move it for a while
3. it will become laggy after 2 seconds of permanent movement

Since i only changed the kernel i thought this could be an kernel driver
issue.

Special on my configuration is that i use multimonitor (3 monitors over 
2 cards).

How could i track down the problem?
Is it my configration somehow?
Is it a known issue (could i have known this before?)

If any more details could help i will provide them.

Regards, christian.

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