Hi, I've spent the day bisecting what exact commit prevented the Nokia N900 from entering the OFF sleep state (between v5.8 and v5.9), and it this commit: > # first bad commit: [facdaa917c4d5a376d09d25865f5a863f906234a] mm: proactive compaction The git tree prior to that commit can idle at about ~27mW in OFF mode, and it will often remain in that mode for prolonged amounts of time (easily 30 seconds, depending on running userspace). Which the above commit applied, the Nokia N900 almost never hits OFF mode any more. This would suggest at least to disable CONFIG_COMPACTION, perhaps in omap2plus_defconfig? I suspect this might cause idle problems beyond the Nokia N900, too. Maybe nothing needs to be done here other than disable the config option -- but I wanted to share this in case others are trying to figure out what happened to their battery life. :-) There seem be more power regressions since then (at least on 5.15 there is more blocking proper idle), so I'll try to find those as well, but if this commit is reverted (or CONFIG_COMPACTION=n is in .config - probably easier) on top of v5.9 the system seems to idle fine. > # grep ^core_pwrdm /sys/kernel/debug/pm_debug/count | cut -d',' -f2, > OFF:16,RET:2 Hope this helps someone... Regards, Merlijn PS: v5.10 seems to use another 19mW if panel_sony_acx565akm is loaded even when display is not active (maybe it doesn't suspend or something? - could be fixed later, just noticed it for v5.10). I load it initially to idle the display, but until I rmmod the modules, the module uses quite a bit more power. This problem is not present in v5.9, so that is another thing to chase down I guess... And then v5.15 uses another 12mW more, for not yet uncovered reasons)
