Re: Laptop resumes each 1h13 after suspend-to-ram

[Eugen Dedu <eugen.dedu@univ-fcomte.fr>]

On 14/09/2025 23:36, Jeffrey Walton wrote:
> On Fri, Sep 12, 2025 at 11:35 AM Eugen Dedu <eugen.dedu@univ-fcomte.fr> wrote:
> > On 11/09/2025 23:42, Jeffrey Walton wrote:
> > > On Thu, Sep 11, 2025 at 2:45 PM Eugen Dedu <eugen.dedu@univ-fcomte.fr>
> > > wrote:
> > >
> > > > I have a weird problem with suspend-to-ram with my Dell Precision 3591
> > > > laptop, which awakes alone/itself, without touching it, each approx. 1
> > > > hour and 13 minutes.  This problem has existed since I installed Debian
> > > > on it, on January.  I tested with several kernels, such as linux 6.12
> > > > and 6.16.  Note that the awake occurs only I suspend by pressing the
> > > > button on the keyboard; if I close the lid it does not awake.
> > >
> > > Update the UEFI before you start down a rabbit hole with the kernel and
> > > drivers.
> > >
> > > It looks like the latest version is 1.11.2 from December 2024. See <
> > > https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=h60cy
> >
> > I am up to date with respect to UEFI, by running fwupdmgr update.  I
> > currently have:
> > └─System Firmware:
> >     └─Latitude 5550,Precision 3590,Precision 3591 System Update:
> >           New version:      1.15.1
> >           Created:          2025-05-12 14:27:25
> >
> > I do not know if this is the same thing as what you wrote, because I do
> > not find your version 1.11.2 in the list shown at
> > https://www.dell.com/support/product-details/fr-fr/product/precision-15-3591-laptop/drivers
>
> Next, decide which component should control power management: UEFI or Systemd.
>
> If you choose UEFI, then disable Systemd power state functions. Mask
> the sleep.target suspend.target hibernate.target hybrid-sleep.target
> units. See <https://www.tecmint.com/disable-suspend-and-hibernation-in-linux/>
> (and friends) for the command.
>
> If you choose Systemd, then go to your BIOS/UEFI setup, and disable
> S3, S4 and S5 power states. Those power states are sleep, suspend and
> hibernate. Systemd will now control them.
>
> Personally, I disable S3,S4 and S5 in the BIOS/UEFI. I allow the
> operating system to control them.

I tested all the options related to sleep in UEFI:
- Power->Block sleep (allow OS to use S3): off=>bug, on=>does not sleep 
anymore (after pressing sleeping button, keyboard is still lighted 
(brightness on) + µP fan on)
- Performance->C-state control (allow CPU to enter/exit low power 
states): both on and off=>bug
- USB wake support (related to dock): on and off=>bug

Alternatively, I disabled Systemd files, after executing:
# systemctl mask sleep.target suspend.target hibernate.target 
hybrid-sleep.target suspend-then-hibernate.target
Now I cannot suspend anymore:
root@snoopy:~# systemctl suspend
Call to Suspend failed: Access denied
root@snoopy:~#
Pressing power button on keyboard does nothing either.