Score:1

Battery drain when lid closed. Two lenovo thinkpads, nearly identical. One is fine the other not. How to diff/debug?

in flag

These are both Thinkpad Carbon X1 nearly identical. I've changed the BIOS, done some grub twiddle etc.

cat /sys/power/mem_sleep 
[s2idle] deep

This should be correct I think?

The thing is I have access to a nearly identical system that appears to be ok (no overnight drain to zero). Am wondering how to diff these two systems methodically? Or just a hail mary guess could also be useful here.

Potentially related:

One additional weird thing is that on the drainy system, chrome seems to freeze for several seconds at a time.

I also see rmi4_f34 rmi4-00.fn34: rmi_f34v7_probe: Unrecognized bootloader version: 13 (

in dmesg on the drainy system.

I haven't fully properly diffed dmesg on the machines but I guess I could do that with some work.

I could I guess try booting to windows and doing another round of driver updates as well. Not sure ... I would expect to see power errors.

UPDATE:

I think the following resolved this:

  • check BIOS sleep state. This was wrong on the misbehaving machine.
  • edit grub as below (reboot)
sudo vi /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mem_sleep_default=deep"

or deep should be s2idle. Not sure.

in flag
Two questions spring to mind: (0) Which version(s) of Ubuntu are you using? (1) What is the swap configuration like on these machines?
mangohost

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