Lost ability to choose 3440x1440 resolution

Well, that was fun:

I eventually got it working, but not without almost hosing my system first!

I worte a blog post about how I managed to get my 3440x1440 resolution (thanks for posting a pre-patched version of the kext josh 🙂

the blog post is here, incase you want to read more: https://jonathansblog.co.uk/lg-34um95-osx-yosemite-resolution-bug

I'll post the steps here too, just incase:

1) download kexbeast

2) download josh's pre-pathced kext

3) open a terminal

cd Desktop

sudo chown -R root:wheel AppleIntel*

sudo chmod -R 775 AppleIntel*

-- this bit was key - if you dont do this part, then the kext wont load as it doesn't have the correct permissions

4) run KextBeast

5) reboot 😀

Hi all and thanks for sorting this out,

I managed to restore the resolution, finally. I did not know the little trick regarding option + click on Scaled (System preferences -> Displays -> Display tab) after the whole patching workaround.

Best regards

Ok so I followed these instructions meticulously a couple of times, first using a patched kext however that just made things 10 times worse for me - jittery screen, mouse lag etc etc. The solution for me in the end was simply to grab a copy of the AppleIntelFramebufferCapri.kext (without patching) from another MacMini (same model) running mavericks in place of the patched version as in step 2 of your instructions.

Thanks for all the help guys, much appreciated!

Can someone please post the original file from Mavericks? I have gone through too many patched and unpatched files and every time I try too patch one I get the graphics problem and have to reinstall the OS. I don't have another machine that has the original .kext file so I'm out of luck there. the fixed file seems to be lost in the many cross-posts.

Burt, try this link here https://www.dropbox.com/s/53trsm2m4v6teb0/AppleIntelFramebufferCapri.kext.zip?dl =0

This is the Mavericks driver from a MacMini (Late 2012) that I simply dropped into place using the KextBeast utility in Yosemite and it worked. Quick update to jonathan's blog instructions above:

1) download kexbeast (http://www.tonymacx86.com/downloads.php?do=file&id=32)

2) download mavericks capri kext and extract to desktop (https://www.dropbox.com/s/53trsm2m4v6teb0/AppleIntelFramebufferCapri.kext.zip?dl =0)

3) open terminal and enter the following command (simply copy/paste):

cd Desktop && sudo chown -R root:wheel AppleIntel* && sudo chmod -R 775 AppleIntel*

4) run KextBeast

5) reboot 😀

Thank you so much Richard,

my eyes are relieved and I can work again, great!

- Tom

Thanks Rich, what a pain that was! And thanks to everyone for finding this fix!

Just found an easy fix for my external monitor and wanted to share. The 4k option had initially appeared when I first plugged it in. After Yosemite and changing the resolution I couldn't get it back. I found this article http://support.apple.com/kb/PH13996 . By going into safe mode I was able to retrieve 4k resolution as an option again. Once I reset normally it defaulted to that option again. Previously I did try to copy over the Display folder and respective ".kext" that was suggested. For whatever reason safe mode allowed it to actually take effect. Hope it works for you all too. Just another bandaid I guess... Be well.

iMac 27 ( late 2012)

Hi Josh,

Have you tried the easy fix suggested by estarr?

I would not upgrade to 10.10.1 if the resolution is broken again.

Best regards

Lasse

I can confirm the fix works with 10.10.1. All you need to do is to install the patched kext from 10.9

You need to run "sudo nvram boot-args=kext-dev-mode=1" first before you install the old kext

I used the same KEXT as before and I am unable to get 3440x1440 back. Can anyone else confirm what YUFENG66 says?

I can confirm that the patch works fine on my machine after the 10.10.1 update with YUFENG66's note about setting boot-args-kext-dev-mode = 1, so updated instructions from above:

This is the Mavericks driver from a MacMini (Late 2012) that I simply dropped into place using the KextBeast utility in Yosemite and it worked. Quick update to jonathan's blog instructions above:

1) download kexbeast (http://www.tonymacx86.com/downloads.php?do=file&id=32)

2) download mavericks capri kext and extract to desktop(https://www.dropbox.com/s/53trsm2m4v6teb0/AppleIntelFramebufferCapri.kext.zip?dl =0)

3) open terminal and enter the following commands (simply copy/paste):

sudo nvram boot-args=kext-dev-mode=1

cd Desktop && sudo chown -R root:wheel AppleIntel* && sudo chmod -R 775 AppleIntel*

4) run KextBeast

5) reboot

Thanks Richard! That Kext worked perfectly for me. BTW: if you use the "Kext Utility.app" you don't have to go through all that nonsense. Just drag and drop the Kext into Kext Utility and it takes care of the rest.