Daemon lockup on Arch Linux (kernel 5.14), Oryx Pro

[willfindlay]

Distribution (run cat /etc/os-release):

NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling
ANSI_COLOR="38;2;23;147;209"
HOME_URL="https://archlinux.org/"
DOCUMENTATION_URL="https://wiki.archlinux.org/"
SUPPORT_URL="https://bbs.archlinux.org/"
BUG_REPORT_URL="https://bugs.archlinux.org/"
LOGO=archlinux

Related Application and/or Package Version (run apt policy $PACKAGE NAME):

As reported by pacman -Qs system76-power:

local/system76-power 1.1.17-1
    System76 Power Management

Other system76 packages installed:

local/system76-acpi-dkms 1.0.2+1+g0bc966c-1
    This provides the system76_acpi in-tree driver for systems missing it.
local/system76-dkms 1.0.13-1
    On newer System76 laptops, this driver controls some of the hotkeys and allows for custom fan control.
local/system76-driver 20.04.41-2
    Universal driver for System76 computers
local/system76-firmware 1.0.29-1
    System76 CLI tool for installing firmware updates
local/system76-firmware-daemon 1.0.29-1
    System76 systemd service that exposes a DBUS API for handling firmware updates
local/system76-io-dkms 1.0.1-1
    This DKMS driver controls System76 IO devices
local/system76-power 1.1.17-1
    System76 Power Management

Issue/Bug Description:

Every once in a while, the system76-power daemon starts seriously misbehaving. In general, this consists of the following:

• 100% CPU usage on one core, as reported by htop
• Running system76-power graphics power off immediately deadlocks
• Inability to terminate the daemon
  • It times out when you try to use systemctl stop system76-power
  • kill -9 $(pidof system76-power) has no effect
• Finally, rebooting the system results in the following message on the TTY: failed to start system76-power daemon. After getting this message, the entire system is locked up until I force a hard shutdown using the power button.

Steps to reproduce (if you know):

I don't have a 100% reliable way to reproduce this, but it seems to occur maybe 3 out of every 4 reboots on my system. If there is any other relevant information you think I can provide (journal logs, etc.) just let me know.

Expected behavior:

Basically none of what I listed above should be happening.

Other Notes:

I am running Arch Linux with a stock 5.14 kernel on an Oryx Pro.