kern/57162: On Thinkpad E14 Gen2, acpibat seems broken

[brian%bemorehuman.org@localhost]

>Number:         57162
>Category:       kern
>Synopsis:       On Thinkpad E14 Gen2, acpibat seems broken
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 05 17:25:00 +0000 2023
>Originator:     Brian Calhoun
>Release:        9.3
>Organization:
>Environment:
NetBSD localhost 9.3 NetBSD 9.3 (GENERIC) #0: Thu Aug 4 15:30:37 UTC 2022 mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
I can't get 9.3 nor 10 Beta to boot from SSD bare metal on this thinkpad E14 Gen2. The boot process hangs, I believe, waiting for acpibat to do something. I was able to successfully install to the ssd from a usb stick-boot, but the boot from the ssd invariably fails. The boot process displays all the dkn wedge info then just stops. I remember one attempted boot (possibly with -v?) displayed a "waiting for response from acpibat0" once per second.

Not sure if related but during a boot from usb stick, I brought up a shell from within the installer and I typed "envstat" which hung the system (no output at all and had to force shutdown with power button).
>How-To-Repeat:
- install 9.3 (or 10-beta) from usb stick to SSD
- try to boot from SSD
- boot process will hang after dkn wedge info display
>Fix:
(temporary workaround) Thanks to tip from Nia, if I disable acpibat in the bootloader with the userconf command, the boot process will proceed as normal.