Some similar kernel bug reports have appeared since the iMac Pro was released last year, and the model is also equipped with a T2 chip. It’s not clear whether it’s a problem with the T2 chip or a problem with the bridgeOS firmware. Apple said last month that it was investigating a small number of reports on kernel errors, but did not say whether this was related to the T2 chip.
Apple released the second system supplement update for the 2018 MacBook Pro running macOS High Sierra 10.13.6 system yesterday but did not mention any resolved issues in the update instructions, only indicated that the patch improved system stability and reliability. Apple gave more specific details when responding to the media today.
Apple said that the latest supplemental update has improved the stability and reliability of the system from multiple links, and has solved some problems, including previously exposed speaker noise issues and kernel errors. Apple recommends that all users install this update.
Some users indicated that the speaker noise problem that occurred before was solved after the update was installed. Apple support community for takashiyoshida said, “this evening, I set the microphone and speaker’s sampling format to 44100 Hz and began playing back music on iTunes,” he explained. “Before the update, I would normally hear the noise in about an hour. I left my MacBook Pro to play music for about three hours and so far I am not hearing any noises.“
However, Reddit users said that they still hear the noise when playing the tubing video on the Safari browser after installing the update, but the noise on the Spotify app disappears.
For kernel error issues, many users have reported at least one kernel error after installing the patch. A user from the Macrumors forum shared a log showing that the system crash was related to bridgeOS, which is a device firmware that controls multiple functions (including T2 chips) on the logic board of the 2018 MacBook Pro.