Yes. This bug still exists. I am experiencing the same issue.
Ubuntu 14.04
ThinkPad W530
One external monitor.
01:00.0 VGA compatible controller: NVIDIA Corporation GK107GLM [Quadro K1000M]
(rev a1) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device 21f5
Flags: bus master, fast devsel, latency 0, IRQ 48
Memory at f0000000 (32-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 5000 [size=128]
Expansion ROM at f1000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nouveau
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https://bugs.launchpad.net/bugs/1228506
Title:
[prime] unsynchronised rendering on secondary displays
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