Lost ability to choose 3440x1440 resolution after Yosemite upgrade

I have an LG 34UM95 connected via TB on a Late 2012 mac mini.

After the Yosemite install, I no longer have the option of choosing 3440x1440 resolution in the Displays preferences. It worked just fine prior to the upgrade.

I did do the Option->Scaled bit to see the extended list of choices, but nothing higher than 2560x1080 shows up.

Can I get my 3440x1440 resolution back?

EDIT: my colorsync profile...

EDIT 2 I just upgraded from 10.10 to 10.10.2. Resolution stayed the same! Woot!! So, either the new update fixed the issue, or it didn't touch the graphics extension.

A bit of a late answer, but this issue is now fixed in Yosemite 10.10.2 - full 3440x1400 (on a macbook air you have to close the lid of your laptop, but it works without hacks!)

I was successful in getting the 3440x1440 resolution back in Yosemite by following the instructions from a discussion on Apple's discussion page.

The thread is a good read, to put the instructions in context, but the gist is as such...

• Disable the kext signature check sudo nvram boot-args=kext-dev-mode=1
• Pull in the AppleIntelFramebufferCapri.kext from TimeMachine prior to the Yosemite upgrade
• Make the small edit as described in the thread above (not going to copy/paste his post verbatim here)
• Reboot

Success!!

I had the 3440x1440 resolution in my Display preferences right away. Didn't even have to hold down Option to see it.

Broken again after 10.10.1 update...

Looking to see if the same fix can still work...