The Catalina 10.15.6 update released yesterday is one of the smaller updates we’ve seen for a while, at around 3 GB in size, considering that bundled in it are EFI firmware updates for all supported models.
Apple states that this update adds an option to optimise video streaming to improve battery life on compatible laptops, fixes issues where some USB mice and trackpads become disconnected, and another where the computer name can change after an update. Apple promises more detail here.
This update brings firmware updates for all recent models, for T2-equipped Macs taking their firmware to 1037.147.1.0.0 (iBridge: 17.16.16065.0.0,0). My firmware database for SilentKnight and those kept here have all been updated accordingly.
Security fixes are few in number, and include a couple for crafted audio files, with just one kernel fix. Full details are here. This update includes an update to the KEXT data file, taking it to version 15.6.1.
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