Delta's Lair

OS X El Capitan introduced lots of changes, most of them are not easy to be found since they are not on the GUI level. Well, SIP can be one of them but this post will not talk about it once again.
Here are some changes/hacks I found.

1. Hibernate mode restriction
To check current hibernate mode setting:

pmset -g custom

“hibernatemode” value teardown (Reference):
_ ____ ___1 (bit 0) enable hibernate, suspend to disk, write sleep image file.
_ ____ __1_ (bit 1) safe sleep, suspend to RAM first, and hibernate when battery level critical.
_ ____ _1__ (bit 2) sleepimage file encryption.
_ ____ 1___ (bit 3) “encourages the dynamic pager to page out inactive pages prior to hibernation, for a smaller memory footprint.”
_ ___1 ____ (bit 4) “encourages the dynamic pager to page out more aggressively prior to hibernation, for a smaller memory footprint.”
_ __1_ ____ (bit 5) set “boot-switch-vars”, useful for CloverEFI on some Hacks.
_ _1__ ____ (bit 6) restart machine after writing sleepimage
_ 1___ ____ (bit 7) SSD mode invert
1 ____ ____ (bit 8) dynamic sleepimage size

And also code reference from Apple Open Source:

enum
{
    kIOHibernateModeOn      = 0x00000001,
    kIOHibernateModeSleep   = 0x00000002,
    kIOHibernateModeEncrypt = 0x00000004,
    kIOHibernateModeDiscardCleanInactive = 0x00000008,
    kIOHibernateModeDiscardCleanActive   = 0x00000010,
    kIOHibernateModeSwitch	= 0x00000020,
    kIOHibernateModeRestart	= 0x00000040,
    kIOHibernateModeSSDInvert	= 0x00000080,
    kIOHibernateModeFileResize	= 0x00000100,
};

Before 10.11, hibernate mode can be set without restriction. However, in 10.11, pmset tool would only allow mode 0, 3 and 25 to be set. If values other than these three need to be set, just edit the system preferences file manually:

/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist

Update – file location for 10.12:

/Library/Preferences/com.apple.PowerManagement.plist

After reboot, the new hibernate mode would be working perfectly as before.

2. Handoff/Continuity support restriction
These features were first introduced in 10.10 and they do require suitable hardwares (BT4 LE + Certain Brcm WiFi) to work. The WiFi and Bluetooth kexts will check hardwares to see if they are supported. For driver level check and restriction, kext patches can be done (just use this lovely CAT) for many unofficial supported hardwares in order to enable these features. If everything goes well as in 10.10, the following system logs should be found:

Device Capabilities (Handoff:YES, Instant Hotspot:YES, AirDrop:YES, Legacy AirDrop:YES, Remote Disc:YES)

Well in 10.11, another whitelist was added in the system config to check every Mac board-id and determine if the continuity could be activated or not:
You may need to find out your mac board-id first:

ioreg -l | grep "board-id"

And then check this file:

/System/Library/Frameworks/IOBluetooth.framework/Versions/A/Resources/SystemParameters.plist

Find your Mac board-id and make sure the ContinuitySupport is set to true/YES.
Also, if the file system protection from SIP is in place, then disable it in the Recovery HD first in order to make any changes to the system config file:

csrutl enable --without fs

3. Maybe more coming…