Re: Dell XPS 13 9360: `slp_s0_residency_usec` stays 0

["David E. Box" <david.e.box@linux.intel.com>]

Hi Paul,

On Fri, 2024-05-24 at 06:53 +0200, Paul Menzel wrote:
> Dear Mario, dear Linux folks,
> 
> 
> Am 22.05.24 um 18:37 schrieb Mario Limonciello:
> > On 5/22/2024 10:52, Paul Menzel wrote:
> 
> > > On the Intel Kaby Lake laptop Dell XPS 13 9360, 
> > > `/sys/kernel/debug/pmc_core/slp_s0_residency_usec` does stay 0 even 
> > > after a s2idle suspend/resume cycle.
> > 
> > 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.
> 
> Sorry, I do not know. It’s the first time [1] I heard about this file, 
> and that fwts [2] checks it. Do you remember, if Dell has any public 
> logs from testing, containing `slp_s0_residency_usec`?
> 
> > 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.
> 
> Thank you for the pointer. Please find the log file from `sudo 
> ./s0ix-selftest-tool.sh -s` attached. Some PCIe ports are flagged.
> 
> 
> Kind regards,
> 
> Paul

The report suggests checking the kernel log for any error loading drm firmware.
If the firmware is loaded properly, you should see a message similar to the
following:

    [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)

David

> 
> 
> [1]: 
> https://review.coreboot.org/c/coreboot/+/81595/10/src/mainboard/cwwk/adl/Kconfig#9
> [2]: https://wiki.ubuntu.com/FirmwareTestSuite/
> 
> 
> > > 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)
> 
> […]