FreeBSD: hdac0 Unexpected unsolicited response from address 1: 0000000
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What to do to get FreeBSD running again
The problem
I upgraded my test system from FreeBSD 14.3 to FreeBSD 15.0 without much issues, so I thought do also upgrade my production system. But after rebooting the system, it didn’t get back up and when I looked at the console I saw the following messages on the screen:
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
hdac0: Unexpected unsolicited response from address 1: 00000000
And those messages just kept coming.