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Well I got my E6520 working on Yosemite 10.10 after spending some time this evening !! I think pretty much everything is working. I got it installed in a similar way as I had Maverick installed. I had Maverick (10.9) working on a partition. See my post: Dell E6520 with NVS 4200M on Mavericks . I created a partition (InstallYosemite) and loaded Yosemite using the following command: sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/InstallYosemite --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction Then, created /Extra in the InstallYosemite partition. I was able to boot after specifying -x option and installed Yosemite to the new partition. I believe I was using MBeast boot loader which was based on Chameleon v2.2 r2404. After OS was installed, I had problem booting from the partition. Tried MBeast, Clover, myHack, and other version of Chameleon. I ended using the latest Chameleon (Chameleon-2.3svn-r2510) and able to boot and upgrade extensions. You can skip extension upgrade steps and simply use the attached Extra. Don't forget to run KextWizard to update the /Extra and /S/L/E ! 12-12-2014: - Graphics (no lagging) - same DSDT - Sound - same AppleHDA - Battery - same ACPBatterManager - Touchpad - same VoodooPS2Controller - CPU stepping - same SSDT - Disk - TRIM Patch IOAHCIFamilty.kext 10.10.x - Network - AppleIntelE1000e v3.1.0 - FakeSMC v6.11.1328 - AppleACPIPlatform v10.9.5 Let's forget to credit where due: - OSX Crew - Disable NVS4200M and using H3000 (Optimus enabled) - E6520 on Mountain Lion by lgashu http://forum.osxlati...-mountain-lion/ - collection of 10.9 kext from iFail - ssdt generation - RevoGirl's blog - touchpad - RhabmanMerg - SDHC - heemsker - others that I missed Attachments: Extra-Yosemite-Install put this into / of the Yosemite installation partition Extra-E6520-Yosemite-<date> put this into / after installing Yosemite; if I update extensions, I will provide updates with a different date Extra-E6520-Yosemite-12-12-2014.zip Extra_Yosemite_Install.zip