On Fri, Sep 12, 2025 at 11:35 AM Eugen Dedu <[email protected]> wrote: > > On 11/09/2025 23:42, Jeffrey Walton wrote: > > On Thu, Sep 11, 2025 at 2:45 PM Eugen Dedu <[email protected]> > > 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. Jeff
