How to Fix iMac was running fine but suddenly loses graphic acceleration.. What I did wrong on macOS
Wi-Fi, Bluetooth, AWDL, Continuity and Location Services problems usually come from chipset support, kext pairing, privacy settings or network-location corruption. On Hackintosh systems, Location Services and Continuity depend on working Wi-Fi, Bluetooth, AWDL and correct AirportItlwm or itlwm/HeliPort behaviour.
Quick Checks
- Backup current state: Save a copy of your working EFI and run a full system backup before changing settings.
- Identify hardware components: Note down your exact CPU, GPU, Wi-Fi card, and motherboard/laptop model.
- Ensure utility alignment: Keep OpenCore, OCLP, and ProperTree updated.
Fix Steps
- Create a rollback point: Make a Time Machine backup and keep a copy of your last working EFI folder before editing OpenCore, kexts or root patches.
- Confirm the exact chipset: Identify the Wi-Fi, Bluetooth and Ethernet controller from System Information, Hackintool or Linux/Windows device manager.
- Use the correct network stack: Match AirportItlwm, itlwm, HeliPort, IntelBluetoothFirmware and BlueToolFixup to the exact macOS version.
- Reset macOS network state: Remove the current Wi-Fi service, reboot, add it again, then reconnect to a simple WPA2 network before testing advanced features.
- Check privacy permissions: Open System Settings and confirm Location Services, Maps, Weather and system services are enabled.
- Test Apple features separately: Verify normal internet first, then Bluetooth, then AirDrop/Continuity. Do not debug all three at the same time.
Do Not Continue If
- Do not continue if: you do not have a working EFI backup, a Time Machine backup, or another bootable macOS installer.
- Stop and capture evidence: if the machine stops booting, take a photo of the last verbose line before changing more settings.
Verify It Worked
- Maps can locate you without falling back to a stale location.
- Wi-Fi reconnects after reboot and sleep.
- Bluetooth remains available after a cold boot.
- Console no longer shows repeated wireless or location daemon errors.
Rollback
- Restore the previous EFI if Wi-Fi disappears completely.
- Switch from AirportItlwm to itlwm + HeliPort, or the reverse, if the issue is specific to one driver path.
- Use Ethernet or USB tethering while testing so you do not lose access to downloads.
Next Action
- Test now: reboot twice, reproduce the original problem, and confirm whether the same symptom returns.
- If it still fails: record the Mac model, macOS build, OpenCore or OCLP version, GPU, Wi-Fi/Bluetooth chipset, and the last visible error.
- Read next: use the related searches below for the nearest OpenCore or OCLP fix before making another change.
Related iATKOS Searches
- OpenCore · OCLP · EFI · kexts · config.plist · macOS troubleshooting
Original Question: "iMac was running fine but suddenly loses graphic acceleration.. What I did wrong?"
 | Hello guys, I would just like to report a situation that happened here to understand what I did wrong... I installed OCLP and Sonoma on my 2013 iMac (21'5) in january without issues and the machine was running tottaly fine (and fast!) until last wednesday. I started up the iMac in the wednesday morning and all seems to be fine, but noted that all graphic acceleration was gone.. It turned sooo slow on opening Chrome and minimize apps windows, for example, and the dock lost its transparency. I am 100% that I did nothing - OCLP was warning that a new version was avaliable, but I cancelled these alerts a few times. I did not updated the machine to 14.2 and 14.3, precisely because I was afraid to mess with the system. It was smooth, there is no reason to update. As the machine turned almost complete unusable with no graphics, I decided to open OCLP and reinstall the root patches. I did it, but from this moment the computer didn't started anymore - I get only the Apple logo and the screen in the picture. I managed to fix the mess reinstalling Catalina from the Internet Recovery and, from there, I updated the iMac again to Sonoma 14.4 via OCLP (and again, smootly with no issues).. Fast and easy, and it is running fine now. But I had to erase/format the SSD to be allowed to do that procedure. Sorry if my question is too dumb, but I wonder to know what the hell I did wrong and why the machine suddenly looses the grapphic acceleration, as the automatic updates are turned off, to be aware in what to do if this happen again - without looses all my files and apps doing a clean installation again. Thank you sooo much for all support =) [link] [comments] |
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