virtualpboy wrote: I have gfxCardStatus 2.3 installed and it doesn't seem to prevent VMWare Fusion 6 (or 5 for that matter) from using discrete graphics at all. On Mavericks, when you open Activity Monitor, it still reports vmware-vmx process as using "high performance" discrete graphics. My VM guest OS is currently mostly idle, and it is reporting hefty 50+ energy impact.
I'm using VMware Fusion 6 under OS X 10.8.3 and when I set gfxCardStatus to Integrated Only that is what's being used while running a Virtual Machine! I based my original reply on the fact that gfxCardStatus reports that Integrated Only is what's being used and the analysis of sampling of the vmware-vmx process is not showing any calls to the GeForceGLDriver until I select either Discrete Only or Dynamic Switching. My testing was further supported by the fact when I plug in my 27" Thunderbolt Display while gfxCardStatus is set to Integrated Only, whether or not the Virtual Machine is running, the Thunderbolt Display stays dark until I select either Discrete Only or Dynamic Switching as it requires the use of the Discrete GPU.
OS X Mavericks has not yet been released however the OS X Mavericks Developer Preview is Beta Software and with the exception of changes to Localizations in gfxCardStatus it appears there hasn't been other work on gfxCardStatus in over 9 months so even though the gfxCardStatus requirements show OS X Lion (10.7) or newer and 2008-2012, 15-17" dual-GPU MacBook Pro, I'd venture to say that gfxCardStatus may not work properly in the OS X Mavericks Developer Preview and since it appears core development hasn't moved in over 9 months that gfxCardStatus may also not work properly in the OS X Mavericks when it is released.