iM 4,1-14,4 2011 iMac Graphics Card Upgrade

[HighSierraCosworth]

No, there is just no real installation instruction. But do handle such a tool one should please read the OpenCore documentation. Then you get an idea how this machine is working.

Long story short (I am writing about the 27" 2011):

If you have already installed all the kext files in advance on your running system to make sleep and other thinks work, you do not need the OC to do to twice - it will stuck while booting the OS. Just fire up the OC Configurator and disable the kext files. Take a look at picture one.

If you start with a fresh install use the selection from picture two - but on a you are not done, now.

There is a another thing to mention: Some files cannot be injected by OC, they have to be installed using the old way as described in this post from @highvoltage12v. You find these files in the folder marked on the third picture added to this post.

Although I had the chance to test some of this in advance, this final version came to me right now.

I had a feeling that something was acting up between the kexts I already had configured and OC. So I’ve formatted my drive, and I don’t mind doing a clean install and having another go, BUT, should I boot into my USB drive from open core, or just normally?

 

[Ausdauersportler]

I had a feeling that something was acting up between the kexts I already had configured and OC. So I’ve formatted my drive, and I don’t mind doing a clean install and having another go, BUT, should I boot into my USB drive from open core, or just normally?

No, installation works as before. I did this 12 hours ago with a former version of OC exactly like this. But as I wrote before, on any 2011 you will have to install some files the old way while others are brought in by OC. I guess the installation instructions on page #1 and the linked pages will be updated, soon. I am not a native speaker, somebody will take this task.

 

[HighSierraCosworth]

No, installation works as before. I did this 12 hours ago with a former version of OC exactly like this. But as I wrote before, on any 2011 you will have to install some files the old way while others are brought in by OC. I guess the installation instructions on page #1 and the linked pages will be updated, soon. I am not a native speaker, somebody will take this task.

Well, time to go for broke. I have absolutely nothing to lose, as you no doubt already know.


Edit : it panicked before I could even choose a destination drive, so I’m finally doing to sensible thing and giving up on this. High Sierra works, and I’ll buy a new iMac soon enough.

 

[highvoltage12v]

I am proud to be the first one to have problems and be exceptionally confused.

The readme makes it sound as though I have to clean install Catalina on top of another OS. I flashed the dmg to a 2GB SD card and it boots High Sierra without issues, but I get stuck on the apple logo when I try to boot Catalina. Yes, I’ve tried the PRAM reset. Should I expect the thing to boot into Catalina, or is it actually necessary to install it?

Your issue is likely having an old version of WhateverGreen/LILU installed to System/Library/Extensions Please navigate there and remove them. All of this needs to be addressed in a proper post. I'm am currently working on this.

Also what card are you working with/Year of iMac, are you working with, can you please add this to your signature, this way I don't have to dig, thanks.

 

[HighSierraCosworth]

Your issue is likely having an old version of WhateverGreen/LILU installed to System/Library/Extensions Please navigate there and remove them. All of this needs to be addressed in a proper post. I'm am currently working on this.

Also what card are you working with/Year of iMac, are you working with, can you please add this to your signature, this way I don't have to dig, thanks.

2011 21.5 inch, K1100M. I formatted that drive and went for a clean install, which panicked before I could choose a destination drive. So I formatted it again and went for PopOS. Which, like High Sierra, works, just by the way.

 

[FlorisVN]

Since Open Core is able to let Mac OS know the display is now detected as "built-in" in theory Target Display Mode on 2010 iMac's should work again. I cannot test this as you need to have a 27" 2010 iMac, and mine is only a 21.5" but I'm about 90% sure it will work again because it did with the 2011 models.

And BTW since TDM mode works with the 2011 iMacs you can essentially have 3 displays again by using 2 iMacs in TDM next to your 27" 2011 iMac.

ok thx for the info !
I was btw wondering if you know if true displayport video signals now also work on 2011 models.. ?
Or does 2011 models still only support thunderbolt signals only using TDM ??

 

[Kieran Roberts]

Hello, can anyone help me please?

I have a 2011 27inch i7 iMac,
The graphics card is dead,
I’m looking at the cheapest option to have a simple straight forward swap out, I’m not worried about boot screens etc, just need a stable GPU to watch videos and light use.
I’m not going to be playing games etc.
The k1000m/k1100m seem to be the cheapest available for me. Are these any good? I don’t want to be flashing bios etc as I don’t really know how to do that.
Just need a simple plug and play.
Also the most common (GTX 765m) is unavailable to me and I can’t seem to find one anywhere online (I’m in UK).
I think maybe Ali-Express had one? Is this a good site?

Cheers

 

[passatgt]

That’s the reason I like to ask first and get the brilliant ideas from you guys. Found some rubber spacers I used (adjusted to left: none and on the right: just one per hole)

The rubber rings keycaps are from a mechanical keyboard to silence it

Did you just used K5 for the die, or put a 1mm copper shim with thermal paste and k5 pro on top?

 

[snam11]

to me opencore is not working (clover does). black screen even with nv_disable=1
but my k1100m is faulty, so...

 

[snam11]

I did some searching and comparing for fun, and i’ve noticed my faulty f1100m has caps c29,c14 on graphic chip side and c658 on the back side.
probably is just a different revision of the same pcb, but does your working K1100m has those caps?

 

[nathan991]

This thread is quite amazing, thanks to everyone here it has been possible for me to get a few years out of my iMac. Yet, I think I am having some issues:

Is there a problem with full graphics acceleration on Nick's vbios? Or, perhaps a compatibility issue in Catalina?

Wondering if you guys can help me out:

I ran the Unigine Heaven benchmark with my stock AMD 6750M and got a score of 250. (OS: High Sierra)

Then, I ran the Unigine Heaven benchmark with a Dell vbios Nvidia K2100M and got a score of 460. (OS: High Sierra)

After just running the Unigine Heaven benchmark with Nick's vbios on the K2100M, I am only getting a score of 361. (OS: Catalina)

Please let me know! A bit troubling for me

 

[SKYNET-1]

Can you share your experience and vbios?

My k610m will arrive tomorrow or the day after tomorrow,Because of the damn coronavirus, the delivery will be delayed.
I checked this website https://www.notebookcheck.net/nvidia-quadro-k610m.98902.0.html, which shows that k610 and k1100 are the same generation and both Kepler-based GPU built on the gk107, but the frequency of video memory is diff,k610m is 2600khz slower than k1100's 2800khz,
I'll try to use the nick's k1100m to flash in k610m, I hope it will work.Can I?
Anyone can help modify the Nick's vbios-rom change the frequency to 2600khz?

u really think GPUs differ because of the clocks?

first of at all: the k610m and the k1100m r completly different GPUs, the 610 is a GK208 and the 1100 is a GK107, the 610 only has 192 shading units, the 1100 384 units, the 610 has a 64bit memory interface, the 1100 a 128bit, the 610 only 1GB mem, the 1100 2GB... etc. etc. etc.

so yes, pls try.. .but after u need a laptop with 2 MXM slots n one working card to reflash the 610 with the original bios.
[automerge]1584293411[/automerge]

No, you won't get a picture on the stock vBIOS without a back-light mod,

AMD users should flash the GOP vBIOS attached, you can do it from windows:

AMDVBFlash / ATI ATIFlash 5.0.567 Download

AMD AMDVBFlash is used to flash the graphics card BIOS. The version released by ATI was called ATIFlash or just WinFlash. It supports all AMD Radeo

www.techpowerup.com

Then use OpenCore to get boot-screen and brightness control with no other mods!




iMac OpenCore Loader.dmg



FEATURES:


[1] Native brightness control on Quadro K1100M & K2100M cards.

(more cards may be added in the future through vBIOS updates)


[2] Target Display Mode on Quadro K1100M & K2100M cards.


[3] Real-time hardware monitoring using HWMonitor app:

Nvidia GPU Die Temp + GPU, VRAM & CPU core Frequencies.

(uses FakeSMC driver patched for real Macs, DO NOT update it)


[4] Reduced boot-screen delay, no more random black-screen boots.


[5] OpenCore + rEFInd boot-pickers on AMD cards with NO MODS!

(allows bootscreen & native brightness control simultaneously)


[6] SideCar + Video acceleration on new AMD cards (Mojave+)

Huge H264 & HEVC video encoding speed improvements in FCPX etc

Playback of DRM protected streaming content (Netflix 4K etc)


2011 iMacs only -


[7] UEFI Windows: Sound fix for HDAudio code 12 driver error,

can also fix some ThunderBolt eGPU resource issues in Windows.

(Enable DSDT in ACPI section of the OpenCore configuration tool)


[8] Mojave & Catalina: Integration of SandyBridge iGPU Kexts

required for the AirPlay + Sleep + GVA QuickSync video fixes

Catalina needs IOSurface.kext replacing FIRST, details here:

2011 iMac Graphics Card Upgrade

EDIT: 7/28/20 Please download the newest Lilu/WhateverGreen kexts from Github, they constantly change. EDIT: 4/17/20 An additional AppleIntelSNBGraphics.kext has been added to the pack to include board ID for iMac Pro/AMD-WX Series Config.plist. You can now have working sleep when your board ID...

forums.macrumors.com

INSTALLATION:

Restore the image to an SD card or USB stick, I do not recommend installing to a non-removable drive. If using an AMD card show hidden files and extract the AMD config.plist file inside the /EFI/OC/ folder. Set the "Catalina Loader" drive as the default boot disk in system preferences or by using Ctrl+Enter from the Apple boot-picker. If you have problems booting just remove the drive and do an NVRAM reset.



WARNING:

Congratulations, you are now running a Hackintosh! I have done some basic safety checks but I can't test everything, there is a non-zero risk that something will go spectacularly wrong. I accept NO responsibility if Apple ban your accounts or if your iMac blows-up, wipes all your data, and injures your cat... Make sure you have current back-ups of all your drives, and use the RomTool to make a back-up of your iMacs BootRom so it can be restored in case of corruption. Configuration tools are included, be careful - here be dragons!




Based on "Catalina Loader" by Rastafabi.

Thanks to Highvoltage12v & Ausdauersportler for testing.

Full credit to all the original developers & those who shared essential information.



Better late than never...

so when i install win10 native without bootcamp, sound will work then?

 

[RRPC]

this tread is great. i try to get as much info as i can.
i want to put a WX7100 in my imac.

but i still have a few questions, or un-sure about. i want to start with out no road blocks.

How to i Flash this card. ?
if i'm right, i cant flash the AMD card via the Nvida Flash tool. in the Linux Live Flash by @xanderon is only a Nvida flasher.

so my option is
A) USB CH341A + SOIC8 Clip programmer.
B) via windows, and remote Display, and use the ATIFlash tool. yes i have a dual-boot windows.

and flash the WX7100_GOP.ROM from post from post #4,921. also have a question about the OpenCore Loader.dmg.
its not clear to me how to install it, and work with it.

thx for the work guy's i'm pretty grateful for all the work

 

[Ausdauersportler]

this tread is great. i try to get as much info as ...

Right now even the guys testing the OC before are overwhelmed by the options. Please stay calm and wait until installation instructions of OC are updated on page #1 of this thread.
Flashing options are already listed there as all the cards available with vBIOS. Please read there...

 

[rc3105]

Right now even the guys testing the OC before are overwhelmed by the options. Please stay calm and wait until installation instructions of OC are updated on page #1 of this thread.
Flashing options are already listed there as all the cards available with vBIOS. Please read there...

If I read the docs right, editing /Volumes/Catalina Loader/EFI/OC/config.plist and changing "ShowPicker" to "BootApple" automatically boots the first MacOS system found.

And "install" just means copying the contents of

/Volumes/Catalina Loader/EFI

into

/dev/disk0s1 (hd efi partition) which can be mounted as /Volumes/EFI


Worked for me anyway...

 

[AnguzYoung]

No, you won't get a picture on the stock vBIOS without a back-light mod,

AMD users should flash the GOP vBIOS attached, you can do it from windows.

Then use OpenCore to get boot-screen and brightness control with no other mods!

AMDVBFlash / ATI ATIFlash 5.0.567 Download

AMD AMDVBFlash is used to flash the graphics card BIOS. The version released by ATI was called ATIFlash or just WinFlash. It supports all AMD Radeo

www.techpowerup.com

Download: iMac OpenCore Loader.dmg


FEATURES:

[1] Native brightness control on Quadro K1100M & K2100M cards.

(more cards may be added in the future through vBIOS updates)

[2] Target Display Mode on Quadro K1100M & K2100M cards.

[3] Real-time hardware monitoring using HWMonitor app:

Nvidia GPU Die Temp + GPU, VRAM & CPU core Frequencies.

[4] Reduced boot-screen delay, no more random black-screen boots.

[5] OpenCore + rEFInd boot-pickers on AMD cards with NO MODS!

(allows bootscreen & native brightness control simultaneously)

[6] SideCar + Video acceleration on new AMD cards (Mojave+)

Huge H264 & HEVC video encoding speed improvements in FCPX etc

Playback of DRM protected streaming content (Netflix 4K etc)


2011 iMacs only -

[7] UEFI Windows: Sound fix for HDAudio code 12 driver error,

can also fix some ThunderBolt eGPU resource issues in Windows.

(Enable DSDT in ACPI section of the OpenCore configuration tool)

[8] Mojave & Catalina: Integration of SandyBridge iGPU Kexts

required for the AirPlay + Sleep + GVA QuickSync video fixes

Catalina needs IOSurface.kext replacing FIRST, more details here:

2011 iMac Graphics Card Upgrade

EDIT: 7/28/20 Please download the newest Lilu/WhateverGreen kexts from Github, they constantly change. EDIT: 4/17/20 An additional AppleIntelSNBGraphics.kext has been added to the pack to include board ID for iMac Pro/AMD-WX Series Config.plist. You can now have working sleep when your board ID...

forums.macrumors.com

INSTALLATION:

Restore the image to an SD card or USB stick, I do not recommend installing to a non-removable drive. If using an AMD card show hidden files and extract the AMD config.plist file inside the /EFI/OC/ folder. Set the "Catalina Loader" drive as the default boot disk in system preferences or by using Ctrl+Enter from the Apple boot-picker. If you have problems booting delete any Lilu or Whatevergreen kexts from S/L/E, to disable OpenCore just remove the drive and do an NVRAM reset.


WARNING:

Congratulations, you are now running a Hackintosh! I have done some basic safety checks but I can't test everything, there is a non-zero risk that something will go spectacularly wrong. I accept NO responsibility if Apple ban your accounts or if your iMac blows-up, wipes all your data, and injures your cat... Make sure you have current back-ups of all your drives, and use the RomTool to make a back-up of your iMacs BootRom so it can be restored in case of corruption (very unlikely, but possible). Configuration tools are included, be careful - here be dragons!


Based on "Catalina Loader" by Rastafabi.

Thanks to Highvoltage12v & Ausdauersportler for testing.

Full credit to all the original developers & those who shared essential information.



Better late than never...

iMac mid 2011 21.5 with K2100M (high sierra) works excellent with brightness control finally!
GPU heatsink temp ~55 degrees (up to max. 64 after 3 hours of playing Resident Evil HD at maximum settings)
Thanks to all you guys for making all this possible and giving an old iMacs a second life!

 

[Ausdauersportler]

If I read the docs right, editing /Volumes/Catalina Loader/EFI/OC/config.plist and changing "ShowPicker" to "BootApple" automatically boots the first MacOS system found.

And "install" just means copying the contents of

/Volumes/Catalina Loader/EFI

into

/dev/disk0s1 (hd efi partition) which can be mounted as /Volumes/EFI


Worked for me anyway...

This will work, but it uses the Apple EFI partition. This was not the intention right now. I would have used a separate SD card or an USB stick to put the "Catalina Loader" image onto.

The next step would be to select this image as the primary boot target in the system pref pane. Using this method you sacrifice the SD slot for booting (/dev/disk2 in my config below), but it is more easy to replace or change the boot selection (using the physical act of pulling the card or stick off the machine) just in case something went wrong on boot. OpenCore could be used to do nasty things on an original Apple system. Otherwise you have to boot from a third disk and change the config.

A third option is the creation and usage of another small partition of 1GB size on disk0 (your primary boot disk) and put there the Catalina Loader there (/dev/disk0s3 in my config listed below) instead of using the SD card or USB stick method. Here my boot disk layout. I disabled the internal boot loader for now by just renaming it. The partition could not be selected for boot until the name has been changed back to "Catalina Loader".

wolf@WolfsiMac27 ~ % diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         449.1 GB   disk0s2
   3:                  Apple_HFS Catalina Loader (v01)   629.1 MB   disk0s3

/dev/disk2 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            Catalina Loader        *7.9 GB     disk2

Configuring the Open Core is done by editing the config.plist found in /EFI/OC/config.plist or more easy by using the Open Core Configurator. Take a look at the picture attached.

 

[Kieran Roberts]

Wow. You folks have done a lot of work here. I have been scrolling through and reading various sections and there is a lot of material to cover. I'm wondering if anyone would be so kind as to make some recommendations based on the following.

My close friend has a 2011 I7 3.4 - I believe its the 2GB video card, but maybe the 1GB.
I have baked the card twice and am looking to replace to make it useable long term. (I really do care for them, but I would prefer to just fix it one more time rather than putting a bandaid on every so many months. : )

I don't need the greatest graphics card in the world here, just something to replace with similar specs, that won't break the bank. (an upgrade in performance is great if the cost is not much more.)
I would like to have boot screen, brightness control and have it working as close to 'normal' as possible. (Normal would be the goal!)

If any bios flashing etc can be done through the computer itself that would be preferred rather than fancy clips, raspberry pi, etc.

I have seen many cards listed, and I am just a little overwhelmed with all of the options, so if you are able to make a few suggestions of options for cards, and the process involved that would be amazing!

Thanks in advance, and thanks for all those who have contributed to making these imac resurrections possible.

Cheers!

Hello, I’m in the same situation as you, what Graphics Card did you buy in the end and how well did it work?
Cheers

 

[rc3105]

Hello, I’m in the same situation as you, what Graphics Card did you buy in the end and how well did it work?
Cheers

Quadro K1100m here and they work great. Cheap, fast enough and easy to flash in the Mac.

 

[Kieran Roberts]

Quadro K1100m here and they work great. Cheap, fast enough and easy to flash in the Mac.

Hello, I’m quite new to flashing BIOS, I’m wondering if you could tell me how to flash it in the Mac, I have very limited knowledge of how this is actually done, any help would be appreciated. I’ve been reading through the internet for hours and can’t seem to find a solid simple guide to use.

I have a 2011 27inch 3.4gHz i7

Thank You

 

[FlorisVN]

Hello, I’m quite new to flashing BIOS, I’m wondering if you could tell me how to flash it in the Mac, I have very limited knowledge of how this is actually done, any help would be appreciated. I’ve been reading through the internet for hours and can’t seem to find a solid simple guide to use.

I have a 2011 27inch 3.4gHz i7

Thank You

please read page 1 of this thread.
All your answers are inside the first wiki post.

 

[Kieran Roberts]

Hello

please read page 1 of this thread.
All your answers are inside the first wiki post.

Thank you,

so correct me if i am wrong,

Whilst in Mac OSX, I set the startup disk to my Windows 10 partition on my iMac, sh disassemble the iMac, put in new Graphics Card (k1100m), boot into Windows 10, use NVFlash program to change the BIOS ROM to the new one found on this forum. Save, then restart and that should be it? Mac OSX will work now?

Problem is that my current graphics card doesn’t work at all so not sure how I would change the startup disk?
Cheers

 

[snam11]

Hello

Thank you,

so correct me if i am wrong,

Whilst in Mac OSX, I set the startup disk to my Windows 10 partition on my iMac, sh disassemble the iMac, put in new Graphics Card (k1100m), boot into Windows 10, use NVFlash program to change the BIOS ROM to the new one found on this forum. Save, then restart and that should be it? Mac OSX will work now?

Problem is that my current graphics card doesn’t work at all so not sure how I would change the startup disk?
Cheers

the easiest/fastest way is to use the linux method.disconnect any internal hdd, pop in the usb with linux, ssh from another pc in same lan, and flash it

2011 iMac Graphics Card Upgrade

so guys, I have a little gift for you to give back after such an incredible thread :D hope you like it, the headaches to get it running were immens for me as a newb. I couldn't stand it to use fckin windows to flash the cards and so I prepared this ~350mb drive I created a Linux Live USB...

forums.macrumors.com

 

[fabienpascal]

..............
Based on "Catalina Loader" by Rastafabi.

Thanks to Highvoltage12v & Ausdauersportler for testing.

Full credit to all the original developers & those who shared essential information.



Better late than never...

Thank you!!!
[automerge]1584367260[/automerge]

So this OpenCore bootloader will only work with the AMD series video cards and not the K1000-K1100 etc NVIDIA Cards?

Nick said the OpenCore bootloader supports the K2100m and K1100m. The other cards are still in the work waiting for a VBIOS update.

 

[Mr-Mur]

Download: iMac OpenCore Loader.dmg

Hi dear Nick, I have tried your a new method using side loader, but no luck, my iMac constantly reboots and cannot start Catalina from my USB sticl

My iMac '27 is filled with a GTX 780M, with a #1 method (flashed ROM & 1 gen VBIOS EFI).

I proceed with a startup error log

Spoiler: It is here

panic(cpu 4 caller 0xffffff802d2652fa): Kernel trap at 0xffffff7faed2781e, type 0=divide error, registers:
CR0: 0x000000008001003b, CR2: 0x00000001095fc000, CR3: 0x0000000361b7e052, CR4: 0x00000000000626e0
RAX: 0x0000000000070000, RBX: 0x0000000000000000, RCX: 0x0000000000000000, RDX: 0x0000000000000000
RSP: 0xffffff819e7ab6cc, RBP: 0xffffff819e7ab700, RSI: 0x000000000000000f, RDI: 0xffffff8048f55300
R8: 0xffffff804c84c3b0, R9: 0x0000000000000002, R10: 0x000000000000001e, R11: 0x0000000000000001
R12: 0x0000000000000000, R13: 0x0000000000000000, R14: 0x0000000000000000, R15: 0x0000000000000001
RFL: 0x0000000000010246, RIP: 0xffffff7faed2781e, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x00000001095fc000, Error code: 0x0000000000000000, Fault CPU: 0x4, PL: 0, VF: 0

Backtrace (CPU 4), Frame : Return Address
0xffffff819e7ab120 : 0xffffff802d13bb2b
0xffffff819e7ab170 : 0xffffff802d2734d5
0xffffff819e7ab1b0 : 0xffffff802d264f4e
0xffffff819e7ab200 : 0xffffff802d0e2a40
0xffffff819e7ab220 : 0xffffff802d13b217
0xffffff819e7ab320 : 0xffffff802d13b5fb
0xffffff819e7ab370 : 0xffffff802d8d2aa9
0xffffff819e7ab3e0 : 0xffffff802d2652fa
0xffffff819e7ab560 : 0xffffff802d264ff8
0xffffff819e7ab5b0 : 0xffffff802d0e2a40
0xffffff819e7ab5d0 : 0xffffff7faed2781e
0xffffff819e7ab700 : 0xffffff7fb0c190ce
0xffffff819e7ab7f0 : 0xffffff7fae102796
0xffffff819e7ab820 : 0xffffff7fae1026a7
0xffffff819e7ab850 : 0xffffff7fae102cbe
0xffffff819e7ab8e0 : 0xffffff7fae0ff4e7
0xffffff819e7ab900 : 0xffffff802d81b216
0xffffff819e7ab960 : 0xffffff802d81adc1
0xffffff819e7aba10 : 0xffffff802d81a10e
0xffffff819e7aba70 : 0xffffff802d819c10
0xffffff819e7abab0 : 0xffffff802d812aab
0xffffff819e7abaf0 : 0xffffff7fae10560b
0xffffff819e7abb20 : 0xffffff7fae1156fa
0xffffff819e7abb40 : 0xffffff7fae117a86
0xffffff819e7abbc0 : 0xffffff7fae10dc0e
0xffffff819e7abc50 : 0xffffff7fae17df61
0xffffff819e7abca0 : 0xffffff802d8149db
0xffffff819e7abd00 : 0xffffff802d86f489
0xffffff819e7abd60 : 0xffffff802d2227df
0xffffff819e7abdb0 : 0xffffff802d1419d8
0xffffff819e7abe10 : 0xffffff802d118635
0xffffff819e7abe70 : 0xffffff802d12f0e5
0xffffff819e7abf00 : 0xffffff802d24b575
0xffffff819e7abfa0 : 0xffffff802d0e3226
Kernel Extensions in backtrace:
com.apple.iokit.IOGraphicsFamily(569.4)[1F9B5D88-52DB-3A16-8373-4F608A3CB2D8]@0xffffff7fae0fe000->0xffffff7fae14efff
dependency: com.apple.iokit.IOPCIFamily(2.9)[ADD485B5-3EF8-37C4-B3C5-F86326E497A4]@0xffffff7fadb2f000
com.apple.driver.AppleBacklightExpert(1.1)[8C2CC4EC-9510-3317-8B8C-94951ED2CB63]@0xffffff7faed26000->0xffffff7faed2bfff
dependency: com.apple.iokit.IOPCIFamily(2.9)[ADD485B5-3EF8-37C4-B3C5-F86326E497A4]@0xffffff7fadb2f000
dependency: com.apple.iokit.IONDRVSupport(569.4)[EACCC42A-9D18-383E-BF13-51910962371C]@0xffffff7fae15d000
dependency: com.apple.iokit.IOGraphicsFamily(569.4)[1F9B5D88-52DB-3A16-8373-4F608A3CB2D8]@0xffffff7fae0fe000
dependency: com.apple.driver.AppleSMC(3.1.9)[8D698096-1F90-3679-8151-22A7665ED287]@0xffffff7faddf5000
com.apple.driver.AppleBacklight(180.1)[9D2389C7-0FAC-3240-A297-B0DBFF488D68]@0xffffff7fb0c17000->0xffffff7fb0c1bfff
dependency: com.apple.iokit.IOPCIFamily(2.9)[ADD485B5-3EF8-37C4-B3C5-F86326E497A4]@0xffffff7fadb2f000
dependency: com.apple.iokit.IONDRVSupport(569.4)[EACCC42A-9D18-383E-BF13-51910962371C]@0xffffff7fae15d000
dependency: com.apple.iokit.IOGraphic3

Where to dig in?