Linux @lemmy.ml strawberry @kbin.earth 3w ago

My laptop doesn't go to sleep, how can I diagnose this?

It should be that if i close the laptop and leave it, even overnight, it should only lose maybe 5% battery, but it actually loses all of it, as if it was on (it gets maybe 5 hrs of battery life)

I have it set to sleep after 5 minutes. What sorts of logs should I check to diagnose the problem?

Fedora 41 KDE spin on a 6th gen lenovo x1 carbon (intel i5-8650U)

aside from this, i really am enjoying linux on my new toy

thank you all

18 comments

Some laptops have a BIOS setting for sleep mode. Windows or Linux. I have had a Lenovo with this setting.
- okay initial testing its good
  
  the whole time i was worried because the light on the lid (in the thinkpad logo) would keep blinking, making me think it wasnt asleep
  
  i left the laptop for 2 hours and it only dropped 1%
  
  thank you
  
  Awesome!
- there is something about sleep something something and the options are windows and linux, so ill see if that fixes it
- I'll have to look for it because my laptop never went to sleep under Linux
This is a deep sleep issue. A google search will show that many modern processors can't actually deep sleep (S3) and therefore the only option is to hibernate or shut it off.

To find out if you can, sleep the computer, wake it up then run:

journalctl | grep S3

There should be a line about what type of sleep is available and another line about what type of sleep your computer was just in.

If S3 is not listed as an available sleep mode you might get lucky and be able to turn it on in the bios. If you can't then you are out of luck.

Since I use fedora atomic, I used this to turn on deep sleep: rpm-ostree kargs --append="mem_sleep_default=deep"

On non atomic I forget exactly how but I think this is the way: https://unix.stackexchange.com/questions/720514/cannot-write-into-sys-power-mem-sleep-in-fedora-36
yum install melatonin
- apt-get install warm-milk
  
  for debian users
  
  Now we need a package called alcohol that makes your laptop go to sleep but still drains its battery
  
  cd /usr/ports/hammertothehead && make && make install
  
  ...for FreeBSD users
I had that symptom, and I found that my laptop was using S2 idle (suspend to idle). I fixed it by switching to S3 sleep (suspend to RAM). I suggest following the instructions in section 3 in this page: https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate

Like many Arch Wiki guides, most of the information on that page is applicable to most Linux distros, not just Arch.
This is interesting. I have the same laptop.

I had this exact issue in popos on it.

I changed a setting in the bios (can't recall exactly now), and that did nothing.

Recently I moved to fedora 41, and the problem disappeared.

So I suspect it's a bios setting.

18 comments