Suspending a Dell XPS 13 9370 laptop fails to enter c0ix sleep states. I followed this guide to check if c0ix states are supported: https://01.org/blogs/qwang59/2018/how-achieve-s0ix-states-linux. Confirmed that this system supports c0ix states. To reproduce: $ sudo powertop --auto-tune $ sudo turbostat --show SYS%LPI rtcwake -m freeze -s 15 rtcwake: wakeup from "freeze" using /dev/rtc0 at Fri Oct 26 16:30:17 2018 16.767175 sec SYS%LPI 0.00 0.00 $ cat /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us 0 I expect system to enter LPI states, but it doesn't. Idle driver: $ cat /sys/devices/system/cpu/cpuidle/current_driver intel_idle Turbostat: $ sudo turbostat --show sysfs --quiet sleep 10 10.007904 sec POLL C1 C1E C3 C6 C7s C8 C9 C10 POLL% C1% C1E% C3% C6% C7s% C8% C9% C10% 2 80 380 460 2270 12 2515 152 4267 0.00 0.03 0.07 0.07 1.75 0.01 2.97 0.82 91.95 0 9 72 90 274 0 444 45 743 0.00 0.00 0.06 0.09 1.50 0.00 4.24 1.33 90.39 1 8 49 65 206 0 191 8 556 0.00 0.02 0.06 0.07 1.30 0.00 1.82 0.23 93.90 0 32 87 67 552 1 275 26 448 0.00 0.15 0.22 0.12 3.62 0.01 2.44 0.74 89.78 0 1 4 10 94 0 64 0 348 0.00 0.00 0.00 0.01 0.63 0.00 0.57 0.00 97.39 0 4 20 24 267 5 478 11 425 0.00 0.00 0.05 0.06 1.95 0.04 4.29 0.24 91.42 0 1 12 24 143 0 107 5 269 0.00 0.00 0.01 0.03 0.82 0.00 0.92 0.17 96.40 0 22 80 112 528 4 718 51 936 0.00 0.03 0.10 0.10 2.92 0.02 7.32 3.76 82.35 1 3 56 68 206 2 238 6 542 0.00 0.00 0.08 0.07 1.28 0.02 2.15 0.07 93.97 I enabled pm debug messages: # echo 1 > /sys/power/pm_debug_messages [ 211.128966] PM: suspend entry (s2idle) [ 211.128968] PM: Syncing filesystems ... done. [ 211.129324] PM: Preparing system for sleep (s2idle) [ 211.130639] Freezing user space processes ... (elapsed 0.003 seconds) done. [ 211.133986] OOM killer disabled. [ 211.133987] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done. [ 211.135499] PM: Suspending system (s2idle) [ 211.135501] Suspending console(s) (use no_console_suspend to debug) [ 211.350902] psmouse serio1: Failed to disable mouse on isa0060/serio1 [ 213.144012] PM: suspend of devices complete after 2008.173 msecs [ 213.144016] PM: suspend devices took 2.009 seconds [ 213.159851] PM: late suspend of devices complete after 15.822 msecs [ 213.176969] PM: suspend-to-idle [ 213.214718] PM: noirq suspend of devices aborted after 37.662 msecs [ 213.214721] ACPI: \_PR_.PR00: LPI: Device not power manageable [ 213.214722] ACPI: \_PR_.PR01: LPI: Device not power manageable [ 213.214723] ACPI: \_PR_.PR02: LPI: Device not power manageable [ 213.214724] ACPI: \_PR_.PR03: LPI: Device not power manageable [ 213.214725] ACPI: \_PR_.PR04: LPI: Device not power manageable [ 213.214726] ACPI: \_PR_.PR05: LPI: Device not power manageable [ 213.214727] ACPI: \_PR_.PR06: LPI: Device not power manageable [ 213.214728] ACPI: \_PR_.PR07: LPI: Device not power manageable [ 213.214729] ACPI: \_SB_.PCI0.GFX0: LPI: Device not power manageable [ 213.214732] ACPI: \_SB_.PCI0.RP03.PXSX: LPI: Device not power manageable [ 213.214733] ACPI: \_SB_.PCI0.RP09.PXSX: LPI: Device not power manageable [ 213.244585] PM: noirq resume of devices complete after 29.837 msecs [ 213.290838] PM: noirq suspend of devices complete after 46.088 msecs [ 226.521418] PM: Timekeeping suspended for 14.000 seconds [ 226.554553] PM: noirq resume of devices complete after 32.920 msecs [ 226.554842] PM: resume from suspend-to-idle [ 226.568725] PM: early resume of devices complete after 3.425 msecs [ 226.604769] ACPI: button: The lid device is not compliant to SW_LID. [ 226.715600] r8152 4-2.2:1.0 enp57s0u2u2: carrier on [ 227.261899] ath10k_pci 0000:02:00.0: Unknown eventid: 118809 [ 227.264979] ath10k_pci 0000:02:00.0: Unknown eventid: 90118 [ 227.361172] PM: resume of devices complete after 792.449 msecs [ 227.361613] PM: resume devices took 0.793 seconds [ 227.361615] PM: Finishing wakeup. [ 227.361615] OOM killer enabled. [ 227.361616] Restarting tasks ... done. [ 227.408015] PM: suspend exit
*** This bug has been marked as a duplicate of bug 199689 ***