hi there,
I have a problem with my laptop under ubuntu on battery only. It shuts down. Can you point me to some logs that I can check so I can pin down if it is hardware/kernel/driver fault. Or maybe nvidia acting up. Currently have 450.102.04 Nvidia proprietary driver on 20.04 Ubuntu mate. Worth mentioning that Windows doesnt have this fault, except yesterday after that 20RH2 update, but then it happened also when on charger, not only on battery. But when I reverted it back it fixed itself.
Hi and welcome to our community 
Is your ubuntu starting shutdown process (clean stop) or directly power off like electrical power lose on desktop computers ?
I'm fixing broken hardware in my free time at my work and got something similar on a Thinkpad t460.
The solution was to unplug the power supply and the external battery, unplug also the secondary battery embedded inside the computer, also, unplug the cmos, press 30sec power button (it will do nothing as there are no battery). Assemble everything back, set up the date inside the bios and i got rid of the issue.
For me, it looks like a CMOS issue - do your computer travel in time ? xD
Good luck
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Hi Olek,
Thank you for your welcome.
Ubuntu directly powers off, like shortcircuited.
You think there is residual electricity in motherboard?
My suspect is that there are some conflict in acpi settings, because this does not happen in windows.
Give it a try as I wrote, will not mess more
Do your PC become hot ?
The issue doe not appear while on charger, it is not thermal issue therefore. It is a power issue. If there is ubuntu probram allowing me to go through system events to see what exact error did it create before shutting down it would be of great help. Thank you
You can check the /var/log/kern.log
Try to note the exact time of the failure and match it with the file.
Mar 11 00:04:58 danilo-Recoil-II-15 org.mate.panel.applet.BriskMenuFactory[4593]: Running Steam on ubuntu 20.04 64-bit
Mar 11 00:04:58 danilo-Recoil-II-15 org.mate.panel.applet.BriskMenuFactory[4593]: STEAM_RUNTIME is enabled automatically
Mar 11 00:04:58 danilo-Recoil-II-15 org.mate.panel.applet.BriskMenuFactory[4660]: Pins up-to-date!
Mar 11 00:05:00 danilo-Recoil-II-15 org.mate.panel.applet.BriskMenuFactory[4593]: Steam client's requirements are satisfied
Mar 11 00:05:00 danilo-Recoil-II-15 org.mate.panel.applet.BriskMenuFactory[4593]: /home/danilo/.steam/debian-installation/ubuntu12_32/steam -nominidumps -nobreakpad
Mar 11 00:05:04 danilo-Recoil-II-15 org.mate.panel.applet.BriskMenuFactory[4754]: STEAM_RUNTIME_HEAVY: ./steam-runtime-heavy
Mar 11 00:05:05 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 3 threads of 1 processes of 1 users.
Mar 11 00:05:05 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 3 threads of 1 processes of 1 users.
Mar 11 00:05:05 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 3 threads of 1 processes of 1 users.
Mar 11 00:05:05 danilo-Recoil-II-15 rtkit-daemon[1413]: Successfully made thread 4796 of process 4740 owned by '1000' high priority at nice level -10.
Mar 11 00:05:05 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 4 threads of 2 processes of 1 users.
Mar 11 00:05:05 danilo-Recoil-II-15 rtkit-daemon[1413]: Successfully made thread 4797 of process 4740 owned by '1000' high priority at nice level -10.
Mar 11 00:05:05 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 5 threads of 2 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 5 threads of 2 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 5 threads of 2 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 5 threads of 2 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Successfully made thread 4839 of process 4839 owned by '1000' high priority at nice level -10.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 6 threads of 3 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 6 threads of 3 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 6 threads of 3 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 6 threads of 3 processes of 1 users.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Successfully made thread 4884 of process 4884 owned by '1000' high priority at nice level -10.
Mar 11 00:05:11 danilo-Recoil-II-15 rtkit-daemon[1413]: Supervising 7 threads of 4 processes of 1 users.
Mar 11 00:05:39 danilo-Recoil-II-15 kernel: atkbd serio0: Unknown key pressed (translated set 2, code 0xf8 on isa0060/serio0).
Mar 11 00:05:39 danilo-Recoil-II-15 kernel: atkbd serio0: Use 'setkeycodes e078 ' to make it known.
Mar 11 00:05:41 danilo-Recoil-II-15 kernel: atkbd serio0: Unknown key released (translated set 2, code 0xf8 on isa0060/serio0).
Mar 11 00:05:41 danilo-Recoil-II-15 kernel: atkbd serio0: Use 'setkeycodes e078 ' to make it known.
Mar 11 00:05:48 danilo-Recoil-II-15 dbus-daemon[1435]: [session uid=1000 pid=1435] Activating service name='org.freedesktop.Notifications' requested by ':1.76' (uid=1000 pid=2060 comm="/opt/Rambox/rambox --hidd>
Mar 11 00:05:48 danilo-Recoil-II-15 dbus-daemon[1435]: [session uid=1000 pid=1435] Successfully activated service 'org.freedesktop.Notifications'
Mar 11 00:07:41 danilo-Recoil-II-15 dbus-daemon[1435]: [session uid=1000 pid=1435] Activating service name='org.freedesktop.Notifications' requested by ':1.54' (uid=1000 pid=1776 comm="/usr/bin/python2 /usr/bin>
Mar 11 00:07:42 danilo-Recoil-II-15 dbus-daemon[1435]: [session uid=1000 pid=1435] Successfully activated service 'org.freedesktop.Notifications'
Mar 11 00:07:44 danilo-Recoil-II-15 pkexec[5325]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Mar 11 00:07:44 danilo-Recoil-II-15 pkexec[5325]: danilo: Executing command [USER=root] [TTY=unknown] [CWD=/home/danilo] [COMMAND=/usr/sbin/mate-power-backlight-helper --set-brightness 18000]
Mar 11 00:08:02 danilo-Recoil-II-15 pkexec[5345]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Mar 11 00:08:02 danilo-Recoil-II-15 pkexec[5345]: danilo: Executing command [USER=root] [TTY=unknown] [CWD=/home/danilo] [COMMAND=/usr/sbin/mate-power-backlight-helper --set-brightness 60000]
Mar 11 00:08:43 danilo-Recoil-II-15 pkexec[5381]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Mar 11 00:08:43 danilo-Recoil-II-15 pkexec[5381]: danilo: Executing command [USER=root] [TTY=unknown] [CWD=/home/danilo] [COMMAND=/usr/sbin/mate-power-backlight-helper --set-brightness 18000]
-- Reboot --
Mar 11 00:09:56 danilo-Recoil-II-15 kernel: microcode: microcode updated early to revision 0xde, date = 2020-05-25
Mar 11 00:09:56 danilo-Recoil-II-15 kernel: Linux version 5.4.0-66-generic (buildd@lgw01-amd64-039) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #74-Ubuntu SMP Wed Jan 27 22:54:38 UTC 2021 (Ubuntu 5.4.0-6>
Mar 11 00:09:56 danilo-Recoil-II-15 kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-66-generic root=UUID=1d895491-96e5-4f05-a1c4-3cbc951db84c ro quiet splash vt.handoff=7
Mar 11 00:09:56 danilo-Recoil-II-15 kernel: KERNEL supported cpus:
Mar 11 00:09:56 danilo-Recoil-II-15 kernel: Intel GenuineIntel
At what exact time you got the outage ?
I don't see something there. Strongly thinking about the issue I got on the T460.
The CMOS thing should help I guess.
Issue was with battery. New one installed works perfectly
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