# Working Around Legacy Acceleration Issues

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

  • Intel 3rd and 4th Gen - GMA series

For those unfamiliar with what is considered a non-Metal GPU, see below chart:

macOS GPU Chart
Graphics Vendor Architecture Series Supports Metal
ATI TeraScale 1 HD2000 - HD4000 No
TeraScale 2 HD5000 - HD6000
AMD GCN (and newer) HD7000+ Yes
Nvidia Tesla 8000GT - GT300 No
Fermi GT400 - GT500
Kepler GT600 - GT700 Yes
Intel GMA GMA900 - GMA3000 No
Iron Lake HD series
Sandy Bridge HD3000
Ivy Bridge (and newer) HD4000 Yes

# 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.

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:

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

With version 0.2.5, this issue should be full resolved

0.2.4 and older Work-Around

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

For those who may experience issues with tccplus, you can manually patch com.apple.TCC to add permissions:

# get app id (Zoom.us used in example):
$ osascript -e 'id of app "zoom.us"'
# output: us.zoom.xos

$ sudo sqlite3 ~/Library/Application\ Support/com.apple.TCC/TCC.db "INSERT or REPLACE INTO access VALUES('kTCCServiceMicrophone','us.zoom.xos',0,2,0,1,NULL,NULL,NULL,'UNUSED',NULL,0,1541440109);"

$ sudo sqlite3 ~/Library/Application\ Support/com.apple.TCC/TCC.db "INSERT or REPLACE INTO access VALUES('kTCCServiceCamera','us.zoom.xos',0,2,0,1,NULL,NULL,NULL,'UNUSED',NULL,0,1541440109);"

# 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

Workaround: Press some combination of Tab, or Tab and then Shift-Tab, or just Shift-Tab until the "Done" button is highlighted. Then press spacebar to activate the button, the same as in any other dialog with a highlighted button halo.

# 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. Additionally logging out and logging in can resolve the issue without requiring a reboot

  • Note, this issue should be exclusive to TeraScale 1 GPUs (ie. HD2000-4000). TeraScale 2 GPUs should not exhibit this issue

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

# Unable to switch GPUs on 2011 15" and 17" MacBook Pros

Currently OpenCore Legacy Patcher, GPU switching between the iGPU and dGPU is broken. The simplest way to set a specific GPU is to disable the dGPU when you wish to remain on the more power efficient iGPU.

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 the iGPU to function 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 in theory. However, currently the proprietary DisplayLink driver refuses to function on legacy-patched systems, either resulting in a windowserver crash loop or no output at all.

# Erratic Colours on ATI TeraScale 2 GPUs (HD5000/HD6000)

Due to an odd bug with ATI's TeraScale 2 GPUs, many users will experience erratic/strobing colours once finished installing and rebooting into the accelerated patches. The issue stems from an incorrect assumption in the GPU drivers where it will enforce the Billion Colour space on your display. To fix, simply force your Display into a lower color depth such as a Million Colours.

Applications that can set color depth are:

# Unable to allow Safari Extensions

Due to an bug on the legacy acceleration patches, users won't be able to enable Safari Extensions

This tool can be used to work-around this issue:

# Cannot Login on 2011 15" and 17" MacBook Pros

By default OpenCore Legacy Patcher will assume MacBookPro8,2/3 have a faulty dGPU and disable acceleration. This is the safest option for most users as enabling dGPU acceleration on faulty Macs will result in failed booting.

However if your machine does not have the dGPU disabled via NVRAM, you'll expereince a login loop. To work around this is quite simple:

  1. Boot macOS in Single User Mode
    • Press Cmd+S in OpenCore's menu when you turn the Mac on
  2. When command line prompt appears, enter the dGPU disabler argument (at the bottom)
  3. Reboot and patched macOS should work normally
  4. If you still want to use the dGPU, run OCLP's TUI app and enable TS2 Acceleration. Then root patch your Mac again
    • Patcher Settings -> Misc Settings -> TeraScale 2 Accel
  5. Either Reset NVRAM or set gpu-power-prefs to zeros to re-enable the dGPU
# Forces GMUX to use iGPU only (ie. disable dGPU)
nvram FA4CE28D-B62F-4C99-9CC3-6815686E30F9:gpu-power-prefs=%01%00%00%00
# To reset, simply write zeros or NVRAM Reset your Mac
nvram FA4CE28D-B62F-4C99-9CC3-6815686E30F9:gpu-power-prefs=%00%00%00%00