# # Working Around Legacy Acceleration Issues

- Downloading older non-Metal Apps
- Unable to run Zoom
- Unable to grant special permissions to apps (ie. Camera Access to Zoom)
- Keyboard Backlight broken
- Photos and Maps Apps Heavily Distorted
- Cannot press "Done" when editing a Sidebar Widget
- Wake from sleep heavily distorted on AMD/ATI in macOS 11.3 and newer
- Unable to achieve GPU Acceleration on 2011 15" and 17" MacBook Pros

The below page is for users experiencing issues with their overall usage of macOS Big Sur and the Legacy Graphics Acceleration patches. Note that the following GPUs currently do not have acceleration support in Big Sur:

- AMD/ATI TeraScale 2 - HD5/6000 series
- Intel 3rd and 4th Gen - GMA series

## # Downloading older non-Metal Apps

Many Apple apps now have direct reliance on Metal for proper functioning, however legacy builds of these apps still do work in Big Sur. See below for archive of many apps such as Pages, iMovie, GarageBand.

- Apple Apps for Non-Metal Macs
  (opens new window)

Note: This archive assumes that you own these copies of these apps through the Mac App Store, Dortania does not condone piracy

## # Unable to run Zoom

Currently Zoom relies partially on Metal and so needs a small binary patch. Dosdude1 has provided a nice script for this:

- Zoom Non-Metal Fix
  (opens new window)

## # Unable to grant special permissions to apps (ie. Camera Access to Zoom)

Due to the usage of `amfi_get_out_of_my_way=1`, macOS will fail to prompt users for special permissions upon application start as well as omit the entires in System Preferences. To work around this, we recommend users install tccplus
(opens new window) to manage permissions.

Example usage with Discord and microphone permissions:

    # Open Terminal and run the following commands
    cd ~/Downloads/
    chmod +x tccplus
    ./tccplus add Microphone com.hnc.Discord

## # Keyboard Backlight broken

Due to forcing `hidd` into spinning up with the fallback mode enabled, this can break the OS's recognition of backlight keyboards. Thankfully the drivers themselves still do operate so applications such as LabTick
(opens new window) are able to set the brightness manually.

## # Photos and Maps Apps Heavily Distorted

Due to the Metal Backend, the enhanced color output of these apps seems to heavily break overall UI usage. To work around this, users reported
(opens new window) forcing the color output of their monitor from Billions to Millions of colors helped greatly. Apps easily allowing this customization are SwitchResX
(opens new window), ResXreme
(opens new window) and EasyRes
(opens new window).

## # Cannot press "Done" when editing a Sidebar Widget

To work around this, simply press Tab to hover over and press spacebar to simulate a click.

## # Wake from sleep heavily distorted on AMD/ATI in macOS 11.3 and newer

Unfortunately a very well known issue the community is investigating, current known solution is to simply downgrade to 11.2.3 or older until a proper fix can be found.

In the event Apple removes 11.2.3 from their catalogue, we've provided a mirror below:

- Install macOS 11.2.3 20D91
  (opens new window)

## # Unable to achieve GPU Acceleration on 2011 15" and 17" MacBook Pros

Currently OpenCore Legacy Patcher doesn't have support for the TeraScale 2 series dGPUs found in the 15" and 17" models. Currently the best way to achieve graphics acceleration is to simply disable the dGPU and force the iGPU always.

The best way to achieve this is to boot Recovery (or Single User Mode if the dGPU refuses to function at all) and run the following command:

    nvram FA4CE28D-B62F-4C99-9CC3-6815686E30F9:gpu-power-prefs=%01%00%00%00

This will disable the dGPU and allow graphics acceleration in Big Sur. Note that external display outputs are directly routed to the dGPU and therefore can no longer be used. Solutions such as a DisplayLink Adapters
(opens new window) can work around this limitation.