Ludovic Courtès skribis: > Looking at the code, it could be because the ‘CanHybridSleep’ method > returns false, but why that would happen is unknown to me. Indeed, if we run ‘dbus-monitor --system’ and ‘herd restart upower-daemon’ (in QEMU), we see this: --8<---------------cut here---------------start------------->8--- method call time=1661890192.586471 sender=:1.40 -> destination=:1.39 serial=16 path=/org/freedesktop/UPower; interface=org.freedesktop.UPower; member=GetCriticalAction method call time=1661890192.586862 sender=:1.39 -> destination=:1.1 serial=17 path=/org/freedesktop/login1; interface=org.freedesktop.login1.Manager; member=CanHybridSleep method return time=1661890192.588676 sender=:1.1 -> destination=:1.39 serial=104 reply_serial=17 string "na" method call time=1661890192.589034 sender=:1.39 -> destination=:1.1 serial=18 path=/org/freedesktop/login1; interface=org.freedesktop.login1.Manager; member=CanHibernate method return time=1661890192.591082 sender=:1.1 -> destination=:1.39 serial=105 reply_serial=18 string "na" method return time=1661890192.591405 sender=:1.39 -> destination=:1.40 serial=19 reply_serial=16 string "PowerOff" --8<---------------cut here---------------end--------------->8--- That is, elogind returns “na” to the Can* methods. Same story on my actual laptop: --8<---------------cut here---------------start------------->8--- $ dbus-send --print-reply --system --dest=org.freedesktop.login1 /org/freedesktop/login1 org.freedesktop.login1.Manager.CanHybridSleep method return time=1661890748.184775 sender=:1.1 -> destination=:1.130 serial=253 reply_serial=2 string "na" $ dbus-send --print-reply --system --dest=org.freedesktop.login1 /org/freedesktop/login1 org.freedesktop.login1.Manager.CanHibernate method return time=1661890756.999248 sender=:1.1 -> destination=:1.131 serial=254 reply_serial=2 string "na" $ dbus-send --print-reply --system --dest=org.freedesktop.login1 /org/freedesktop/login1 org.freedesktop.login1.Manager.CanPowerOff method return time=1661890761.375007 sender=:1.1 -> destination=:1.132 serial=258 reply_serial=2 string "yes" --8<---------------cut here---------------end--------------->8--- This is not surprising since our ‘logind.conf’ reads: --8<---------------cut here---------------start------------->8--- HybridSleepState=disk --8<---------------cut here---------------end--------------->8--- … meaning that “hybrid sleep” attempts to suspend-to-disk¹, something that’s not implemented yet in Guix System². Setting ‘hybrid-sleep-state’ to '("mem") doesn’t help though: “CanHybridSleep” still returns “na”. I’m looking at ‘can_sleep_state’ in elogind without seeing why it doesn’t return true. To be continued… Ludo’. ¹ Per . ² But it’s almost there! https://issues.guix.gnu.org/49475