HD4000 graphics problems when using a very big external screen

Fascinated to find your posts m_star.

Thank you for elaborating on how you achieved success.

I have a 2012 13" Retina MacBook Pro with the HD4000.

I am planning to buy the same LG Display when I get back home (have a few more months on the road) and I have been worried about getting that display to work with my 'not the latest' MacBook.

I hope I can figure out how to do what you describe, for I am truly eager to use the 34UM95.

Maybe it is too soon to ask this question of anyone because I don't possess the display yet and since I am not able to work on the problem at the moment because of traveling...

However, if there is a quick answer to this question and if you have time to give me some additional hope with a response...

How does someone go about finding the "AppleIntelFramebufferCapri.kext", change it to the numbers you have had success with, and then refresh the cache?

==> Is this a file I can easily find and edit in a text editor and then drop in a folder to copy over the previous file?

==> Is there a command line entry to refresh the cache? (not that I really know anything about command line entries either)

These are all things admittedly a bit over my head as I am not a programmer (designer and writer), but I am competent at following directions and I have been known to dig deep and successfully into various technical and computer challenges in life when I have good guideposts.

Thank you again for putting this info up.
It was a true joy to find.

I was able to use m_star's suggestion to fix this issue with my 2012 13" MBP. This is what I did to get it fixed:

(1) Get KextBeast

(2) Get a Hex editor like Hex Fiend

(3) Using terminal copy AppleIntelFramebufferCapri.kext to the desktop (cp -r ./System/Library/Extensions/AppleIntelFramebufferCapri.kext ~/Desktop/)

(4) Open ~/Desktop/AppleIntelFramebufferCapri.kext/Contents/MacOS/AppleIntelFramebufferC apri with the Hex Editor

(5) Search for "03 00 66 01 01 02 04 02 00 00 00 04 00 00 00 01", so you know what to change

(6) Replace this sequence with "03 00 66 01 01 02 04 02 00 00 00 04 00 00 40 01", which is basically just the second last group

(7) Save the file and close the hex editor

(8) Run KextBeast which will install this kext to where it needs to go

(9) Reboot

m_star,

did you upgrade to yosemite? I don't have the 3440x1440 resolution available under yosemite. I guess if you can figure out the frame buffer issue, you can probably figure out the resolution issue too.

I have a Mac Mini with the Intel HD 4000 and since the Yosemite update I dont have the resolution 3440 x 1440 anymore either. I would also appreciate if someone could check this as I have to work with 2560 x 1080 right now 😟.

GOOOOOD NEWS (temporary quick fix)

I managed to install the OLD patched kext from Mac OS 10.9 and got it working (after disabling the kext signature check !!!)

1) open terminal and type:

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

2) install the OLD patched kext from MAC OS 10.9 and recreate the kext cache as described by gilmorej (see above)

3) reboot

4) open monitor settings and select the desired (full) resolution

5) enjoy 😝

Maik

Any chance you'd like to post your kext file?

(to save us all from hacking away at it?)

PS: I too am suffering from OS X 10.10 (Yosemite) downgrading my HD4000 so that my LG 34UM95-P is useless. 😟

I confirming that using "old" Maverick HD4000 Drivers (kext, bundles) on Yosemite works. 3440x1440 resolution on Yosemite (on MacMini 2012) is choosable again and 34UM95 will also use this resolution. However the "scrambled" lower part issue is now there.

After using instructions above I still have the scrambled lower part, however: just 3440x1440 resolution is active....will try to restore drivers...if meanwhile somebody has a full set - of working & patched drivers to be applied with kext utility or kextbeast - that would be marvelous....

This worked for me as well. Disabled kext check, pulled in the 10.9 version of the AppleIntelFramebufferCapri.kext, edited it as per gilmorej, rebooted and it worked! I actually didn't even have to hold option to see the 3440x1440 resolution as an option. It was just there.

Simpler solution to regain 3440 x 1440 resolution: Go to your Time Capsule backup and restore an earlier version of AppleIntelFramebufferCapri.kext (before upgrading to Yosemite). This worked like a charm for me, restoring full 3440 x 1440 resolution.

Obviously this only works if you are using Time Capsule backups.

If you are using Time Capsule, follow these steps:

1. From the Finder, select Go > Go to folder... and enter "/System/Library/Extensions/". This will get you in the right file location.

2. Right-click the Time Capsule icon in the menu bar (it looks like a clock with a counter-clockwise arrow), and select Enter Time Machine.

3. Use the up-arrow, or click on one of the stacked windows, to select an backup from a time prior to your Yosemite upgrade.

4. Give it a few seconds to load the Extensions folder files, and select AppleIntelFramebufferCapri.kext.

5. Click Restore and follow the prompts to enter your password.

6. Restart the computer.

7. Go to System Preferences > Displays

8. Select the radio button for Scaled, and you should see the 3440 x 1440 option.

Thank you to m_star and gilmorej for identifying that the culprit is the frame buffer, and that AppleIntelFramebufferCapri.kext was the offending file.

I tried following your instructions, and changed ...01... to ...40..., etc., but that didn't work for me. Not sure why. Then I remembered Time Capsule. Restoring the Mavericks version of AppleIntelFramebufferCapri.kext from Time Capsule, and restarting, immediately fixed the problem.

For reference: I am running a late 2012 Mac Mini connected to an LG 34UM95-P display via thunderbolt cable. When I first connected the LG to the Mini running Mavericks, I had the screen tearing issue that m_star identified with the screen shot. But that problem fixed itself after a restart. The Mac Mini has never been able to drive the LG at 60hz, but it is fine at 50hz. After upgrading to Yosemite, I had the exact problem that yufeng66 and bjoern.s describe, where the 3440 x 1440 option disappeared, leaving a max resoultion of 2560 x 1080 after upgrading to Yosemite.

Could you just add a patched kext here for other users that have same problems

The maverick version of the AppleIntelFramebufferCapri.kext worked for me as well. Now I have 3440x1440 working on my mid 2012 Macbook Air.

The screen still got corrupted some times, even with the patched version. It happens most after I boot up the computer with lid closed but opened it later. It works find as long as keep the lid closed. Also if I boot up the computer with the lid open, it seems to work most of the time too.

Related question: My Mac Mini is connected via Thunderbolt cable to the LG 34UM95-P. It is having repeated "failure to wake from sleep" errors requiring a hard reboot of the Mini (hold down power button for +/- 8 seconds to shut down, then power back on). Still need to do some testing to be sure, but I don't seem to have this problem when it is connected via HDMI cable. Anybody else having this issue?

More info: I had the Mini connected via Thunderbolt to the LG under Mavericks, and it was having this wake-from-sleep failure. I swapping to the HDMI cable and that seemed to fix the issue, but I can't be sure since I only had it set up that way for a short time before upgrading to Yosemite. After switching to Yosemite, I had the issue with 3440 x 1440 resolution not being available (see earlier post) and I tried swapping back to the Thunderbolt cable to fix the problem. Swapping cables wasn't a fix for the resolution issue, but after resolving the resolution issue (see above for the fix that did work, i.e. restoring the AppleIntelFramebufferCapri.kext file from Mavericks) I left left the Thunderbolt cable connected, and the wake-from-sleep failures recurred. I just swapped back to HDMI cable to see if that fixes it. Stay tuned...