Refresh rate glitch could leave MacBook Pro 14' and 16' models unbootable
The issues revolve around how recent versions of macOS handle refresh rates, and MacBook Pro models with ProMotion displays are affected. According to the Asahi team, the bugs lurk in the upgrade and boot process and, when combined, can create a condition where a machine always boots to a black screen, and a Device Firmware Update recovery is needed.
Asahi Linux's techies have looked into the issue, having first suspected it had something to do with either having an Asahi Linux installation on a Mac and then upgrading to macOS Sonoma or installing Asahi Linux after a Sonoma upgrade. However, the issue appears to be unconnected to the project.
The second occurs if a display is configured to a refresh rate other than ProMotion. According to the Asahi Linux team, the system will no longer be able to boot into old macOS installs or Asahi Linux."This includes recovery mode when those systems are set as the default boot OS, and also System Recovery at least until the next subsequent OS upgrade."
The Asahi Linux installer has been tweaked to check for the issue and will refuse to install if the refresh rate on affected machines is set to anything other than ProMotion mode. It will also perform an integrity check to verify the status of the System Recovery partition before making any changes."We do not understand how Apple managed to release an OS update that, when upgraded to normally, leaves machines unbootable if their display refresh rate is not the default.
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