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Dell Latitude E6440 with i5-4300M, HD4600 and 1600x900 LCD - Mavericks/Yosemite/El Capitan/Sierra


Hervé

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Last update: 05 Aug 2016

 

E6440_Front.jpg E6440_Sides.jpg
Specifications:

  • BIOS A05/A08/A13/A14/A21 (needs HDD set to AHCI mode)
  • Intel QM87 (8 Series) Express chipset
  • Intel dual-core Haswell i5-4300M 2.6GHz CPU (Turbo boost to 3.2GHz/3.3GHz for 2cores/1core active) -> needs Haswell-patched kernels
  • integrated Intel HD4600 GPU 400-1250MHz (PCI ven id 0x8086, dev id 0x0416)
  • discrete AMD Radeon HD 8690M 2Go GPU (PCI ven id 0x1002, dev id 0x6660) -> unsupported
  • 14" 1600x900 WideScreen LCD
  • 8Go DDR3L-1600 RAM
  • Intel i217-LM Gigabit Ethernet (PCI ven id 0x8086, dev id 0x153a)
  • Realtek ALC3226 (Codec=ALC292) High Def audio (PCI ven id 0x10ec, dev id 0x0292)
  • Intel Centrino N6235 wireless card (PCI ven id 0x8086, dev id 0x088e - unsupported) + Bluetooth 4.0 (PCI ven id 0x8087, dev id 0x07da)
  • Sonix Technology integrated HD webcam (USB internal, PCI ven id 0xc45, dev id 0x649d)
  • O2 Micro SD card reader (PCI ven id 0x1217, dev id 0x8520)
  • CD/DVD drive
  • 1 x headset jack
  • 4 x USB 3.0 ports
  • 1 x VGA output
  • 1 x HDMI output
  • 1 x 34mm ExpressCard slot

 

pc34:~ admin$ lspci -nn
pcilib: 0000:01:00.0 64-bit device address ignored.
pcilib: 0000:00:02.0 64-bit device address ignored.
00:00.0 Host bridge [0600]: Intel Corporation Haswell DRAM Controller [8086:0c04] (rev 06)
00:01.0 PCI bridge [0604]: Intel Corporation Haswell PCI Express x16 Controller [8086:0c01] (rev 06)
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell Integrated Graphics Controller [8086:0416] (rev 06)
00:03.0 Audio device [0403]: Intel Corporation Haswell HD Audio Controller [8086:0c0c] (rev 06)
00:16.0 Communication controller [0780]: Intel Corporation Lynx Point MEI Controller #1 [8086:8c3a] (rev 04)
00:19.0 Ethernet controller [0200]: Intel Corporation Unknown device [8086:153a] (rev 04)
00:1a.0 USB controller [0c03]: Intel Corporation Lynx Point USB Enhanced Host Controller #2 [8086:8c2d] (rev 04)
00:1b.0 Audio device [0403]: Intel Corporation Lynx Point HD Audio Controller [8086:8c20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation Lynx Point PCI Express Root Port 1 [8086:8c10] (rev d4)
00:1c.2 PCI bridge [0604]: Intel Corporation Lynx Point PCI Express Root Port 3 [8086:8c14] (rev d4)
00:1c.4 PCI bridge [0604]: Intel Corporation Lynx Point PCI Express Root Port 5 [8086:8c18] (rev d4)
00:1c.5 PCI bridge [0604]: Intel Corporation Lynx Point PCI Express Root Port 6 [8086:8c1a] (rev d4)
00:1c.6 PCI bridge [0604]: Intel Corporation Lynx Point PCI Express Root Port 7 [8086:8c1c] (rev d4)
00:1c.7 PCI bridge [0604]: Intel Corporation Lynx Point PCI Express Root Port 8 [8086:8c1e] (rev d4)
00:1d.0 USB controller [0c03]: Intel Corporation Lynx Point USB Enhanced Host Controller #1 [8086:8c26] (rev 04)
00:1f.0 ISA bridge [0601]: Intel Corporation Lynx Point LPC Controller [8086:8c4f] (rev 04)
00:1f.2 SATA controller [0106]: Intel Corporation Lynx Point 6-Port SATA AHCI Controller [8086:8c03] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation Lynx Point SMBus Controller [8086:8c22] (rev 04)
01:00.0 Display controller [0380]: Advanced Micro Devices [AMD] nee ATI Unknown device [1002:6660]
03:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6235 [8086:088e] (rev 24)
05:00.0 Network controller [0280]: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) [168c:002a] (rev 01)
0e:00.0 SD Host controller [0805]: O2 Micro, Inc. Unknown device [1217:8520] (rev 01)

 

For recommended BIOS settings, see here.

 

 

Target OS X release:

  • Mavericks 10.9.5

Installation fully successful with myHack v3.3.1 and attached Latitude E6440 bootpack on a SATA-III 6Gb/s mSATA SSD, fitted into full-size mSATA/PCIe/USB internal slot, partitioned GUID, formatted Mac OS X (journaled). Initial build in 10.9.4, followed by 10.9.5 update.

E6440_Mav.jpg
 
E6440_10.9.5.jpg E6440_TurboBoost.jpg
E6440_HDMI#1.jpg
E6440_HDMI#2.jpg E6440_HDMI#3.jpg
E6440_Audio.jpg  E6440_USB.jpg

 

 

  :excl:  :excl:  :excl:

  • Reset BIOS to default and set SATA mode to AHCI to begin with
  • Mavericks installation with myHack USB installer should be done via left-side USB port (right + rear ones won't work initially).
  • Make sure you use a Haswell-patched kernel to boot the installer, i.e. boot the USB installer with Chameleon options: -f -v
  • Do not forget to copy this patched kernel to the root of the Mavericks partition upon installation completion but before you proceed with 1st reboot. Use Terminal from Utilities menu to that effect. Try and be quick because there is only a handful of seconds before the auto-restart countdown expires. If you miss it, just restart the USB installer and go straight to Utilities->Terminal to proceed.
  • Use the following command to copy Haswell-patched kernel: cp / /Volumes//mach_kernel

:excl:  :excl:  :excl:

 
Working:

  • full QE/CI with HD4600 on 1600x900 LCD (with DSDT patch)
  • HDMI video output in mirror and extension modes (hot plugging/unplugging Ok with patched Azul framebuffer)
  • keyboard backlight & backlight control OOB
  • trackpad + nub
  • LCD brightness control OOB
  • audio output (speakers/jack/HDMI with ALC292-patched AppleHDA, speakers only with VoodooHDA v2.8.1v or later + AppleHDADisabler)
  • built-in Gigabit Ethernet (with AppleIntelE1000e kext v2.5.4d)
  • Intel N6235 Bluetooth OOB (with removal of AppleHPET kext)
  • integrated Webcam OOB
  • display & system sleep/wake (with DSDT patch + hibernatemode set to 0 + deletion of /var/vm/sleepimage). Sleeps through lid closure, power button, Fn-F1, Apple Menu->Sleep and energy savings settings. Wakes through lid opening or On/Off button. 
  • wireless with compatible mini PCIe card/USB dongle (I added an Atheros AR5B93 half-size mini-PCIe card in the WWAN slot - works OOB)
  • battery management & monitoring (with VoodooBattery or AppleSmartBatteryManager kext v1.32)
  • limited native SpeedStep (multipliers 8, 17, 26) @0.8/1.7/2.6GHz  + TurboBoost (multipliers 27-32/33) @2.7-3.2/3.3GHz (Kozlek's FakeSMC  v6.11.1328 tuned up for MBA6,2/SMC keys 2.13f9/smc-huronriver + SMBIOS MBP11,1 + tuned-up SSDT)
  • all USB3.0 ports OOB (with DSDT patch + removal of AppleHPET kext)
  • SD card reader (with DSDT patch)

 

Not tested yet:

  • ExpressCard

 

Not working yet:

  • VGA video output (feasible on HD4600?)

 

GeekBench 2.4.3 (32bit) gives a good 8000+ rating:
E6440_GB32.jpg
 
 

Mavericks full /Extra pack: 

  • E6440_i5-4300M_HD4600_Mav-Pack.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#2.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#3.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#4.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#5.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#6.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#7.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#8.zip
  • E6440_i5-4300M_HD4600_Mav-Pack#9.zip

 

Haswell-patched 10.9 kernels:

 

DSDT patches applied:

  • original raw DSDT clean-up (12 errors)
  • Azul framebuffer #12 injection
  • USB sleep (devices EHC1/EHC2/XHC)
  • audio after sleep
  • Display PrefPane brightness bar
  • Lid closure sleep
  • SD card reader (compatibility with device listed in AppleSDXC kext)

 

:!:   :!:   :!: Other E6440 laptops fitted with same graphics hardware config (GPU + LCD) but different CPUs will require a different SSDT table than provided in the above pack (can be looked up on the web or created with SSDT generator tool -> See RampageDev's blog for detailed guide).  In such cases and in order to avoid CPU power management-related kernel panics (KP), NullCPUPowerManagement kext is recommended until the CPU-specific SSDT is generated. The kext just needs to be added to /Extra/Extensions followed by myHack->myFix (quick).

 
- - - - - - - - - -
Edit #1: 22 Oct 2014

  • added a patched DSDT to obtain Sleep/Wake (raw DSDT extracted from BIOS A05)
  • cleaned up some kexts
  • changed SMBIOS from MacBookAir6,2 to MacBookPro11,1 to gain 1 intermediate SpeedStep multiplier: x17 @1.7GHz

- - - - - - - - - -
Edit #2: 09 Nov 2014

  • all USB ports + Intel N6235 BlueTooth work OOB after removal of AppleHPET kext from /S/L/E
  • post clean-up

- - - - - - - - - -
Edit #3: 14 Feb 2015

  • added DSDT patches for Display PrefPane brightness bar + sleep on lid closure
  • added 10.9.5 Security Update 2015-002 Haswell-patched kernel

- - - - - - - - - -
Edit #4: 11 Mar 2015

  • added revised SSDT table modified to support x17 intermediate CPU multiplier + Sleep through Fn-F1

- - - - - - - - - -
Edit #5: 10 Apr 2015

  • Replaced joe82's AppleSDXC kext patch by DSDT patch to support SD card reader natively OOB

- - - - - - - - - -
Edit #6: 13 Apr 2015

  • Little cleanup of the thread

- - - - - - - - - -

Edit #7: 5 Jul 2015

  • Added 10.9.5 Security Update 2015-005 Haswell-patched kernel

- - - - - - - - - -

Edit #8: 5 Aug 2016

  • Revised DSDT to fully support USB3.0 ports natively (renaming of XHC to XHC1, Darwin OSYS) and fix issue of instant Wake on Sleep (removal of _PRW methods for devices GLAN/HDEF/EHC1/EHC2/XHC1)
  • Added Rehabman's FakePCIID + FakePCIID_XHCIMux kexts to support USB USB3.0/USB2.0 mux
  • Removed ACPIPoller kext and patched AppleSDXC kexts
  • Replaced VoodooHDA/AppleHDADisabler by patched AppleHDA (to be copied to /S/L/E)
  • Replaced VoodooBattery kext by Rehabman's ACPIBatteryManager kext
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Apple having unified display and computer sleep for Haswell platforms, the Energy Saver preference panel only shows one sleep bar:

EnergySavings_Haswell_Unified.jpg

 

To revert to the traditional separation, the Mac model platform plist needs to be edited to turn off this sleep unification.

 

In plugin kext X86PlatformPlugin of /S/L/E/IOPlatformPluginFamily, a list of Mac model plists is found in the Resources subfolder. Each Mac model corresponds to the board number specified in the SMBIOS plist of a Hackintosh. In the present case of a MacBookPro11.1, the Mac model is 189A3D4F975D5FFC as displayed in Chameleon Wizard for instance:

Mac-model_SMBIOS.jpg

 

As such, the plist Mac-189A3D4F975D5FFC.plist should be modified as follows:

-> before

     <key>UnifiedSleepSliderPref</key>
      <true/>

-> after

     <key>UnifiedSleepSliderPref</key>
      <false/>
Once the plist is changed, the kext cache can be rebuilt. On subsequent reboot, the Energy Saver panel will be back to its traditional form and can be adjusted as desired (otherwise, it's command lines only... :?) :
EnergySavings_Haswell_NotUnified.jpg
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Moved on to Yosemite...
 
E6440_i5-4300M_HD4600_Yos10.10.jpg
 
E6440_Yos.jpg E6440_Yos_SpeedStep_Turbo.jpg
 
E6440_DVDPlayer_features.jpg E6440_CardReader.jpg
 
Good news: everything that works under Mavericks also works under Yosemite.
 
 
Installation process was the same one as I previously used for the D630n, i.e. manual USB installer creation + Clover boot loader:

  • Mount InstallESD.dmg found in Install OS X Yosemite.app/Contents/SharedSupport
  • Then mount BaseSystem.dmg (hidden file)
open /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg
  • Use Disk Utility to restore the contents of BaseSystem.dmg on a USB key (or HDD partition) formatted Mac OS extended (journaled).
  • Remove link for Packages in folder System/Installation of your USB key
rm /Volumes/OS\ X\ Base\ System\ 1/System/Installation/Packages
  • Copy folder Packages located in InstallESD.dmg to folder System/Installation of your USB key
cp -R /Volumes/OS\ X\ Install\ ESD/Packages /Volumes/OS\ X\ Base\ System\ 1/System/Installation
  • Copy the 2 hidden files (BaseSystem.dmg & Basesystem.chunklist) of InstallESD.dmg to the root of your USB key
cp /Volumes/OS\ X\ Install\ ESD/BaseSystem.* /Volumes/OS\ X\ Base\ System\ 1

|

For those who want to use Clover as boot loader:

  • Install Clover_v2k_r2695.zip (or later) to your USB key.
  • Configure your config.plist to boot with option "kext-dev-mode=1" as follows:
<key>Boot</key>
   <dict>
      <key>Arguments</key>
      <string>-v kext-dev-mode=1</string>
   </dict>

* About option "kext-dev-mode=1": in Yosemite, "unsigned or malsigned" kexts will not be loaded. To use such kexts, the restriction can be lifted by adding option "kext-dev-mode=1" at boot phase.

  • Copy all your kexts (FakeSMC.kext, etc.) to EFI/CLOVER/kexts/10.10 (consider this the "kext" boot pack). Grab kexts from the Mavericks boot pack.
  • Copy the SSDT + Yosemite-specific DSDT to EFI/CLOVER/ACPI/patched E6440_HD4600_Yos10.10_DSDT.aml.zip
  • Adjust Clover config.plist as required (you can use this file E6440_HD4600_Clover_config.plist.zip).
  • Start your USB key.
  • The OS X installer should then load. Proceed with installation as usual.

The DSDT differs from the Mavericks version in the sense that it injects fake desktop HD4600 id 0x0412 to replace mobile HD4600 id 0x0416. The reason for this is that Apple did not include support for Mobile HD4600 in their Yosemite Azul framebuffer and AppleIntelHD5000Graphics kexts. In that same sense, those 2 kexts also require to be patched to add/inject the mobile HD4600 id 0x04168086 in the Info plist and binmod the kext binary file to replace desktop HD4600 id (86 80 12 04) by mobile HD4600 id (86 80 16 04). All this is quite extensively documented on the web and results from the work of several well-known Hackintoshers like Pike.R.Alpha or RehabMan and others...
 
The following patched kexts should be copied to /S/L/E to replace the original ones (keep a backup somewhere).
AppleIntelFramebufferAzul.kext.zip AppleIntelHD5000Graphics.kext.zip 
 
You may also do the same with the following patched kext in order to avoid the corrupt screen on Yosemite desktop initialisation.
IOGraphicsFamily.kext.zip
 
 
For those who wish to use Chameleon instead of Clover (you can safely use r2395 or r2401 and possibly above):

  • copy the Haswell-patched kernel to be placed as is at Yosemite partition's root or in /S/L/K as "kernel" to replace the vanilla file (here again, keep a backup).
  • create /Extra folder with Yosemite-specific DSDT + SSDT + SMBIOS & boot plists using the following pack:
    • E6440_i5-4300M_HD4600_Yos-Pack.zip
    • E6440_i5-4300M_HD4600_Yos-Pack#2.zip
    • E6440_i5-4300M_HD4600_Yos-Pack#3.zip
    • E6440_i5-4300M_HD4600_Yos-Pack#4.zip
    • E6440_i5-4300M_HD4600_Yos-Pack#5.zip
  • copy the Yosemite pack kexts to /S/L/E, replacing any vanilla kext (keep a backup beforehand); alternatively, copy kexts to /L/E
  • open Terminal and rebuild permissions and cache with commands sudo chmod -R 755 /S*/L*/E* + sudo chown -R 0:0 /S*/L*/E* sudo touch /S*/L*/E* + sudo kextcache -Boot -U / (replace /S*L/*E* by /L*/E* if you copied kexts to /L/E)

With Chameleon, it's critical to rebuild the cache with above 4 commands or the installation will become unbootable. Chameleon cannot boot Yosemite without cache! As such, bear that in mind any time you add or modify kexts in Yosemite.
 
 
Remember to set hibernate mode to 0 (zero) and to remove /var/vm/sleepimage.
 
The system requires additional tuning so additional posts will follow in due course.

 

:!:    :!:    :!: Again, other E6440 laptops fitted with same graphics hardware config (GPU + LCD) but different CPUs will require a different SSDT table than provided in the above pack (can be looked up on the web or created with SSDT generator tool -> See RampageDev's blog for detailed guide).  In such cases and in order to avoid CPU power management-related kernel panics (KP), NullCPUPowerManagement kext is recommended until the CPU-specific SSDT is generated. The kext just needs to be added to /Extra/Extensions or /S/L/E.

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Sometimes, weird things happen. All of a sudden, DVD Player stopped working and returned the well known initialisation error:
DVD_error.jpg
 
I installed the IOAHCISerialATAPI_injector kext and the DVD came back to life, though slightly differently and somehow improved this time. When looking at the Supported Features in the Help menu, HD is no longer reported Unsupported like it used to be:
DVD_SupportedFeatures.jpg
 
This applies to both Mavericks and Yosemite. I had been playing with DSDT/SSDT recently so the trouble may originates from that. 'need to see if I can suss out a way to get rid of that horrible little kext though.
 
IOAHCISerialATAPI_Injector.kext.zip

 

I'll add it to the next Yosemite boot pack.

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I've identified the SSDT-related problem and it appears the culprit that messes up behaviour of Fn-F1 (causing the key combination to shutdown the laptop rather than put it to sleep) is the following _DSM method at the very end of the \_PR.CPU0 scope:

       Method (_DSM, 4, NotSerialized)
      {
          Store ("Method CPU0._DSM Called", Debug)
          If (LEqual (Arg2, Zero))
          {
              Return (Buffer (One)
              {
                   0x03    // This appears to be the value causing trouble
              })
          }
          Return (Package (0x02)
          {
              "plugin-type", 
              One
          })
      }
I'd lie by pretending to know what this particular value equates to, but am investigating...
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I decided to try and return various alternative values from the _DSM method of the generated SSDT. By trial and error, I regained x17 CPU multiplier and retained Sleep through Fn-F1 when returning a value of 7. I'm therefore sticking to the following code:

       Method (_DSM, 4, NotSerialized)
      {
          Store ("Method CPU0._DSM Called", Debug)
          If (LEqual (Arg2, Zero))
          {
              Return (Buffer (One)
              {
                   0x07 // This values retains x17 CPU multiplier + Sleep via Fn-F1
              })
          }
          Return (Package (0x02)
          {
              "plugin-type", 
              One
          })
      }

CPU_P-States.jpg

 

I've also noticed that the Chameleon option DropSSDT=Yes is not necessary to obtain native CPU SpeedStep and/or Turbo boost. I've therefore changed my boot plist to that effect.

ssdt.aml.zip org.chameleon.Boot.plist.zip

 

:excl: In order to guarantee good behaviour of Fn-F1, make sure hibernate mode is set to 0 and that there is no 'sleepimage' file in /var/vm directory. If present, it must be deleted. A safety alternative consists of pointing the hibernate file to /dev/null.

 

NB: The above applies to both Mavericks and Yosemite.  :)

 

Updated Mavericks pack loaded to post #1 (pack #7) and updated Yosemite pack loaded to post #15 (pack #3).

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Thanks to JakeLo who passed on the details for testing, the Yosemite Azul frame buffer kext can now be binary patched to support HDMI output: the patch consists of replacing Hex code 01050900 00040000 87000000 by Hex code 01051200 00080000 87000000 in binary file  AppleIntelFramebufferAzul through perl script or via a binary editor such as 0xED.
 
HDMI output is then fully supported with hot plug/unplug. The only thing weird is the reported TV screen size (73.5" for an actual 40" screen!)
 
E6440_10.10.2_LCD+HDMI.jpg
E6440_HDMI_to_HD-TV.jpg
 
10.10.2_HDMI-bin-patched_AppleIntelFramebufferAzul.kext.zip
 
I have also verified that HDMI output can be sole video output when booting up the laptop with lid closed; it worked perfectly but system then hung when I opened up the lid... Best to avoid such mode in those conditions.
 

Updated Yosemite pack loaded to post #15 (pack #4).

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Following on another valuable advice from JakeLo and since we could get the SD card reader to work natively by patching the AppleSDXC kext, the following DSDT patch (under device [email protected],7, that's where it's found in IOReg) avoids all subsequent kext patches, especially as that was required after each OS X update:

               Device (SDXC)
               {
                    Name (_ADR, Zero)
                    Method (_DSM, 4, NotSerialized)
                    {
                        Store (Package (0x08)
                        {
                            "AAPL,slot-name", 
                            "Built-in", 
                            "device_type", 
                            Buffer (0x11)
                            {
                                "Media controller"
                            }, 
                            "model", 
                            Buffer (0x18)
                            {
                                "O2 Micro SD card reader"
                            }, 
                            "compatible", 
                            Buffer (0x0D)
                            {
                                "pci14e4,16bc"
                            }
                        }, Local0)
                        DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
                        Return (Local0)
                    }
                    ...

The Info.plist file of the vanilla AppleSDXC kext containing a specific reference to Broadcom BCM57765/57785 SDXC/MMC card reader (PCI device 14e4:16bc), a simple statement "compatible" referring to that device enables the 02 Micro SD card reader once and for all, the rest of the patch being cosmetic info for the SysProfiler!

E6440_O2_CardReader.jpg E6440_O2_CardReader#2.jpg

 

This applies to both Mavericks and Yosemite so kext packs updated accordingly (Mavericks pack #8 in post #1 and Yosemite pack #5 in post #9).

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When using Rehabman's most recent or latest ACPIBatteryManager kext (v1.60.x for instance), battery icon keeps flapping between battery level and no battery, this being accompanied by a very annoying flapping of screen brightness.

 

I've looked into the DSDT to try and fix this and noticed 2 x different battery devices: BAT0 and BAT1.

        Device (BAT0)
        {
            Name (_HID, EisaId ("PNP0C0A"))
            Name (_UID, One)
            Name (_PCL, Package (0x01)
            {
                _SB
            })
            Method (_STA, 0, NotSerialized)
            {
                Store (ECG5 (), Local0)
                And (Local0, 0x02, Local0)
                If (Local0)
                {
                    Return (0x1F)
                }


                Return (0x0F)
            }


            Method (_BIF, 0, NotSerialized)
            {
                Name (BIF0, Package (0x0D) {})
                ECG9 (One, BIF0)
                Return (BIF0)
            }


            Method (_BST, 0, NotSerialized)
            {
                Name (BST0, Package (0x04) {})
                ECG6 (One, BST0)
                Return (BST0)
            }
        }


        Device (BAT1)
        {
            Name (_HID, EisaId ("PNP0C0A"))
            Name (_UID, 0x02)
            Name (_PCL, Package (0x01)
            {
                _SB
            })
            Method (_STA, 0, NotSerialized)
            {
                Store (EEAC (0x05, Zero), Local0)
                If (LLess (Local0, 0x02))
                {
                    Return (Zero)
                }


                Store (ECG5 (), Local0)
                And (Local0, 0x08, Local0)
                If (Local0)
                {
                    Return (0x1F)
                }


                Return (0x0F)
            }

`

After some research on the issue and reading several real MacBook's DSDT code, I experimented a little on this and obtained what I believe to be a good and suitable solution by:

  1. removing the DSDT section related to Device (BAT1)
  2. replacing all remaining DSDT references to BAT1 by BAT0
  3. renumbering Device (BAT0) _UID identifier from 1 to 0

 

Since applying those changes, battery icon and screen brightness have stopped flapping.  :)

 

I invite all E6440 owners to try out this patched DSDT and report accordingly.

New_E6440_DSDT_Battery_Fix.zip

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