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[gmud <877438@xxxxxxxxxxxxxxxxxx>]

Same problem here, Macbook Pro with


01:00.0 VGA compatible controller: nVidia Corporation GT216 [GeForce GT 330M] (rev a2) (prog-if 00 [VGA controller])
	Subsystem: Apple Computer Inc. Device 00c7
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at c0000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at 90000000 (64-bit, prefetchable) [size=256M]
	Region 3: Memory at a0000000 (64-bit, prefetchable) [size=32M]
	Region 5: I/O ports at 2000 [size=128]
	[virtual] Expansion ROM at c1000000 [disabled] [size=512K]
	Capabilities: <access denied>
	Kernel driver in use: nvidia
	Kernel modules: nvidia, nouveau, nvidiafb

It's really slow when I connect another monitor. It was slow with Natty,
too, but not at unusable like the new Ubuntu version. I have tried
different version of the Nvidia graphics driver without any success to
make it better.

I noticed that after plugging in the monitor compiz needs unusal long to
"recover".

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https://bugs.launchpad.net/bugs/877438

Title:
  Unity compiz plugin makes display slow on multi-screen

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