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It won't change your numbers but FWIW you can also read from $ cat /sys/power/suspend_stats/last_hw_sleep which is also accessible under kernel lockdown. > >     $ sudo dmesg >     […] >     [    0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 > 06/02/2022 >     […] >     [10176.745124] PM: suspend entry (s2idle) >     [10176.757275] Filesystems sync: 0.012 seconds >     [10176.769118] Freezing user space processes >     [10176.771693] Freezing user space processes completed (elapsed > 0.002 seconds) >     [10176.771710] OOM killer disabled. >     [10176.771714] Freezing remaining freezable tasks >     [10176.773487] Freezing remaining freezable tasks completed > (elapsed 0.001 seconds) >     [10176.773504] printk: Suspending console(s) (use > no_console_suspend to debug) >     [10176.948337] ACPI: EC: interrupt blocked >     [10176.951016] intel_pch_thermal 0000:00:14.2: CPU-PCH is cool [48C] >     [10181.281827] ACPI: EC: interrupt unblocked >     $ sudo more /sys/kernel/debug/pmc_core/slp_s0_residency_usec >     0 > > Is that expected? Is it a regression? If so; probably it's worth bisecting. If it's not a regression IIUC you should probably run https://github.com/intel/S0ixSelftestTool for assistance in next steps on debugging why this is happening. > > > Kind regards, > > Paul > > > PS: Some system details: > > ``` > $ LANG= lspci -nn > 00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v6/7th Gen > Core Processor Host Bridge/DRAM Registers [8086:5904] (rev 02) > 00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics > 620 [8086:5916] (rev 02) > 00:04.0 Signal processing controller [1180]: Intel Corporation Xeon > E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem > [8086:1903] (rev 02) > 00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB > 3.0 xHCI Controller [8086:9d2f] (rev 21) > 00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise > Point-LP Thermal subsystem [8086:9d31] (rev 21) > 00:15.0 Signal processing controller [1180]: Intel Corporation Sunrise > Point-LP Serial IO I2C Controller #0 [8086:9d60] (rev 21) > 00:15.1 Signal processing controller [1180]: Intel Corporation Sunrise > Point-LP Serial IO I2C Controller #1 [8086:9d61] (rev 21) > 00:16.0 Communication controller [0780]: Intel Corporation Sunrise > Point-LP CSME HECI #1 [8086:9d3a] (rev 21) > 00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI > Express Root Port #1 [8086:9d10] (rev f1) > 00:1c.4 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI > Express Root Port #5 [8086:9d14] (rev f1) > 00:1d.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI > Express Root Port #9 [8086:9d18] (rev f1) > 00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-LP LPC > Controller [8086:9d58] (rev 21) > 00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-LP PMC > [8086:9d21] (rev 21) > 00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-LP HD Audio > [8086:9d71] (rev 21) > 00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-LP SMBus > [8086:9d23] (rev 21) > 01:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 > Bridge [Alpine Ridge 2C 2015] [8086:1576] > 02:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 > Bridge [Alpine Ridge 2C 2015] [8086:1576] > 02:01.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 > Bridge [Alpine Ridge 2C 2015] [8086:1576] > 02:02.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 > Bridge [Alpine Ridge 2C 2015] [8086:1576] > 39:00.0 USB controller [0c03]: Intel Corporation DSL6340 USB 3.1 > Controller [Alpine Ridge] [8086:15b5] > 3a:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac > Wireless Network Adapter [168c:003e] (rev 32) > 3b:00.0 Non-Volatile memory controller [0108]: SK hynix PC300 NVMe Solid > State Drive 512GB [1c5c:1284] > $ LANG= lscpu > Architecture:             x86_64 >   CPU op-mode(s):         32-bit, 64-bit >   Address sizes:          39 bits physical, 48 bits virtual >   Byte Order:             Little Endian > CPU(s):                   4 >   On-line CPU(s) list:    0-3 > Vendor ID:                GenuineIntel >   Model name:             Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz >     CPU family:           6 >     Model:                142 >     Thread(s) per core:   2 >     Core(s) per socket:   2 >     Socket(s):            1 >     Stepping:             9 >     CPU(s) scaling MHz:   14% >     CPU max MHz:          3500.0000 >     CPU min MHz:          400.0000 >     BogoMIPS:             5799.77 >     Flags:                fpu vme de pse tsc msr pae mce cx8 apic sep > mtrr pge mca cmov >                            pat pse36 clflush dts acpi mmx fxsr sse sse2 > ss ht tm pbe sy >                           scall nx pdpe1gb rdtscp lm constant_tsc art > arch_perfmon pebs >                            bts rep_good nopl xtopology nonstop_tsc > cpuid aperfmperf pni >                            pclmulqdq dtes64 monitor ds_cpl vmx est tm2 > ssse3 sdbg fma c >                           x16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe > popcnt tsc_dead >                           line_timer aes xsave avx f16c rdrand lahf_lm > abm 3dnowprefetc >                           h cpuid_fault epb ssbd ibrs ibpb stibp > tpr_shadow flexpriorit >                           y ept vpid ept_ad fsgsbase tsc_adjust sgx > bmi1 avx2 smep bmi2 >                            erms invpcid mpx rdseed adx smap clflushopt > intel_pt xsaveop >                           t xsavec xgetbv1 xsaves dtherm ida arat pln > pts hwp hwp_notif >                           y hwp_act_window hwp_epp vnmi md_clear > flush_l1d arch_capabil >                           ities > Virtualization features: >   Virtualization:         VT-x > Caches (sum of all): >   L1d:                    64 KiB (2 instances) >   L1i:                    64 KiB (2 instances) >   L2:                     512 KiB (2 instances) >   L3:                     4 MiB (1 instance) > NUMA: >   NUMA node(s):           1 >   NUMA node0 CPU(s):      0-3 > Vulnerabilities: >   Gather data sampling:   Vulnerable >   Itlb multihit:          KVM: Mitigation: VMX disabled >   L1tf:                   Mitigation; PTE Inversion; VMX vulnerable >   Mds:                    Vulnerable; SMT vulnerable >   Meltdown:               Vulnerable >   Mmio stale data:        Vulnerable >   Reg file data sampling: Not affected >   Retbleed:               Vulnerable >   Spec rstack overflow:   Not affected >   Spec store bypass:      Vulnerable >   Spectre v1:             Vulnerable: __user pointer sanitization and > usercopy barriers >                            only; no swapgs barriers >   Spectre v2:             Vulnerable; IBPB: disabled; STIBP: disabled; > PBRSB-eIBRS: Not >                            affected; BHI: Not affected >   Srbds:                  Vulnerable >   Tsx async abort:        Not affected > ```