I have a Windows dual boot, and Windows did install some updates, and Lenovo site indicates that the latest BIOS version was released mid November, so that could be it.

running sleepgraph crashes the computer same way deep sleep does 😖

Yeah, if the bracket is on deep, it crashes and enter the BIOS recovery thingy. If it’s s2idle, it does what it says on the tin.

No, hibernation saves state to disk, and turns the computer off, drawing no power. Deep sleep is what was for me just sleep until recently: it uses power to keep data in ram, so it’s faster to wake up than hibernation. The amount of power used is really small, so unless you don’t use your lap top for a couple of days, it won’t deplete the battery. New hardware has this new “S2 Idle” state, that is basically an “On” state minus the screen and it’s OS’s job to try to use as little power as possible usually by telling each and every device to chill as much as possible (this is my understanding, but don’t quote me on this). On Windows, with the first party device drivers, this sorta works OK + OS drops to deep sleep or hibernation depending on battery or something.

It’s 2021 Lenovo ThinkBoot 15 G2 Intl with Intel i3-1115G4, 8GB onboard ram, integrated GPU and two NVME slots.

Here are some lines from dmidecode if they mean anything to anyone:

Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.
Handle 0x0000, DMI type 0, 26 bytes
BIOS Information
        Vendor: LENOVO
        Version: F8CN42WW(V2.05)
        Release Date: 06/28/2021
        Address: 0xE0000
        Runtime Size: 128 kB
        ROM Size: 16 MB
        Characteristics:
                PCI is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                ACPI is supported
                USB legacy is supported
                BIOS boot specification is supported
                Targeted content distribution is supported
                UEFI is supported
        BIOS Revision: 2.42
        Firmware Revision: 2.42

Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: LENOVO
        Product Name: 20VE
        Version: ThinkBook 15 G2 ITL
        SKU Number: LENOVO_MT_20VE_BU_idea_FM_ThinkBook 15 G2 ITL
        Family: ThinkBook 15 G2 ITL

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
        Manufacturer: LENOVO
        Product Name: LNVNB161216
        Version: SDK0J40700 WIN

So… Bios update broke deep sleep, because fuck you, that’s why?