Starting from kernel 6.5, a regression in the kernel is causing Bluetooth to not work on T2 Macs with BCM4377 chip. Journalctl of kernel 6.4.8 which has Bluetooth working is given here: https://pastebin.com/u9U3kbFJ Journalctl of kernel 6.5.2, which has Bluetooth broken is given here: https://pastebin.com/aVHNFMRs Also, the bug hasn’t been fixed even in 6.6.1, as reported by users. Some relevant bits imo: • Sep 19 21:24:36 RudyUbuMbp kernel: hci_bcm4377 0000:73:00.1: can't disable ASPM; OS doesn't have ASPM control • Nov 14 01:29:28 RudyUbuMbp kernel: Call Trace: • Nov 14 01:29:28 RudyUbuMbp kernel: <TASK> • Nov 14 01:29:28 RudyUbuMbp kernel: dump_stack_lvl+0x48/0x70 • Nov 14 01:29:28 RudyUbuMbp kernel: dump_stack+0x10/0x20 • Nov 14 01:29:28 RudyUbuMbp kernel: __ubsan_handle_shift_out_of_bounds+0x156/0x310 • Nov 14 01:29:28 RudyUbuMbp kernel: ? ttwu_do_activate+0x80/0x290 • Nov 14 01:29:28 RudyUbuMbp kernel: ? raw_spin_rq_unlock+0x10/0x40 • Nov 14 01:29:28 RudyUbuMbp kernel: ? try_to_wake_up+0x292/0x6c0 • Nov 14 01:29:28 RudyUbuMbp kernel: ? sched_slice+0x76/0x140 • Nov 14 01:29:28 RudyUbuMbp kernel: ? reweight_entity+0x15c/0x170 • Nov 14 01:29:28 RudyUbuMbp kernel: __reg_op.cold+0x14/0x38 • Nov 14 01:29:28 RudyUbuMbp kernel: bitmap_release_region+0xe/0x20 • Nov 14 01:29:28 RudyUbuMbp kernel: bcm4377_handle_ack+0x8c/0x130 [hci_bcm4377] • Nov 14 01:29:28 RudyUbuMbp kernel: bcm4377_poll_completion_ring+0x196/0x330 [hci_bcm4377] • Nov 14 01:29:28 RudyUbuMbp kernel: ? rcu_gp_kthread_wake+0x57/0x90 • Nov 14 01:29:28 RudyUbuMbp kernel: bcm4377_irq+0x77/0x140 [hci_bcm4377] • Nov 14 01:29:28 RudyUbuMbp kernel: __handle_irq_event_percpu+0x4c/0x1b0 • Nov 14 01:29:28 RudyUbuMbp kernel: handle_irq_event+0x39/0x80 • Nov 14 01:29:28 RudyUbuMbp kernel: handle_edge_irq+0x8c/0x250 • Nov 14 01:29:28 RudyUbuMbp kernel: __common_interrupt+0x4f/0x110 • Nov 14 01:29:28 RudyUbuMbp kernel: common_interrupt+0x45/0xb0 • Nov 14 01:29:28 RudyUbuMbp kernel: asm_common_interrupt+0x27/0x40 • Nov 14 01:29:28 RudyUbuMbp kernel: RIP: 0033:0x7f17b5fd8bca
