Laptop randomly rebooted instantly without any warning

Hello guys
It’s my first post here, hope this meet the community rules
As title says, I was doing something and out of nowhere system rebooted just like I have run ‘reboot’ command in the terminal. I saw this older post, but there was not any useful info, regardless I took the last ten minutes system journal logs after I re entered the system.
here is the link https://0x0.st/o5mX.txt. Hope I am not exposing any security info. Reboot happened at 18:04:30

Thanks in advance

welcome to the purpleside :enos:

Dec 20 18:00:36 parthGalen audit[911932]: USER_START pid=911932 uid=1000 auid=1000 ses=2 msg='op=PAM:session_open grantors=pam_systemd_home,pam_limits,pam_unix,pam_permit acct="root" exe="/usr/bin/pkexec" hostname=? addr=? terminal=? res=success'
Dec 20 18:00:36 parthGalen kernel: audit: type=1105 audit(1671544836.097:327): pid=911932 uid=1000 auid=1000 ses=2 msg='op=PAM:session_open grantors=pam_systemd_home,pam_limits,pam_unix,pam_permit acct="root" exe="/usr/bin/pkexec" hostname=? addr=? terminal=? res=success'
Dec 20 18:00:36 parthGalen pkexec[911932]: pam_unix(polkit-1:session): session opened for user root(uid=0) by (uid=1000)
Dec 20 18:00:36 parthGalen pkexec[911932]: stranger: Executing command [USER=root] [TTY=unknown] [CWD=/home/stranger] [COMMAND=/usr/bin/xfpm-power-backlight-helper --set-brightness 102]
Dec 20 18:01:32 parthGalen pkexec[914187]: pam_unix(polkit-1:session): session opened for user root(uid=0) by (uid=1000)
Dec 20 18:01:32 parthGalen audit[914187]: USER_START pid=914187 uid=1000 auid=1000 ses=2 msg='op=PAM:session_open grantors=pam_systemd_home,pam_limits,pam_unix,pam_permit acct="root" exe="/usr/bin/pkexec" hostname=? addr=? terminal=? res=success'
Dec 20 18:01:32 parthGalen pkexec[914187]: stranger: Executing command [USER=root] [TTY=unknown] [CWD=/home/stranger] [COMMAND=/usr/bin/xfpm-power-backlight-helper --set-brightness 156]
Dec 20 18:01:32 parthGalen kernel: audit: type=1105 audit(1671544892.423:328): pid=914187 uid=1000 auid=1000 ses=2 msg='op=PAM:session_open grantors=pam_systemd_home,pam_limits,pam_unix,pam_permit acct="root" exe="/usr/bin/pkexec" hostname=? addr=? terminal=? res=success'
Dec 20 18:04:30 parthGalen systemd-logind[492]: The system will reboot now!
Dec 20 18:04:30 parthGalen systemd-logind[492]: System is rebooting.

/usr/bin/xfpm-power-backlight-helper --set-brightness 156
is executing this calling reboot?

Probably not :laughing: , or we have a hacked config for that unit (lm-sesnsors).

It sounds like a hardware problem, either a BIOS setting that conflicts system PM setup, or a fake (or real) battery drainage, or even a broken chip (cold welding?/ψυχρή κόλληση).

Edit: I wonder if this is a real Arch/EnOS system, though… or something else?

BOOT_IMAGE=/boot/vmlinuz-linux51911

Since you mention hardware side I would like to specify that I use Asus Vivobook S 14(2022 version). It’s too new to have such battery issues and I am running this system install since day one(like 3 months or more) and had not such issue before

Edit: about vmlinuz
It’s a patched linux build branched from kernel 5.19.11. By default my laptop’s keyboard is not supported until 6.1 is out, so I had to patch the kernel myself(I just added several lines of code in resources.c file)