Dear David,
Am 31.05.24 um 05:52 schrieb Paul Menzel:
Am 30.05.24 um 23:24 schrieb David E. Box:
On Fri, 2024-05-24 at 06:53 +0200, Paul Menzel wrote:
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.
The report suggests checking the kernel log for any error loading drm
firmware.
Did you conclude that from the lines below?
GFX DC5 after S2idle: 59
GFX DC6 after S2idle: 0
Your system CPU Model ID is: 142, and the graphics DC6 value is not expected to enter DC9,
please check the latest display DMC FW load status:
Your system Intel graphics DMC FW loaded status is:yes
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)
The firmware is loaded:
[ 124.536942] i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
Further tries show, the system does not reach PC10 state without
ignoring LTR 8 (PMC0:SOUTHPORT_C). With that LTR ignored, I think there
are sometimes problems regarding suspend/resume ACPI S3, but I have to
test that further. But even if with PC10 states being reached, after
S0ix suspend/resume, `slp_s0_residency_usec` remains 0.
Newly booted with nothing attached:
```
$ sudo turbostat --quiet --show
CPU%c1,CPU%c6,CPU%c7,GFX%rc6,Pkg%pc2,Pkg%pc3,Pkg%pc6,Pkg%pc7,Pkg%pc8,Pkg%pc9,Pk%pc10,SYS%LPI
rtcwake -m freeze -s 10
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "freeze" using /dev/rtc0 at Fri Jun 14 09:05:12 2024
10.931644 sec
CPU%c1 CPU%c6 CPU%c7 GFX%rc6 Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 Pkg%pc8
Pkg%pc9 Pk%pc10 SYS%LPI
1.40 0.56 96.21 589.96 2.83 0.44 0.13 0.01 92.07 0.00 0.00 0.00
0.84 0.24 96.89 589.96 2.83 0.44 0.13 0.01 92.07 0.00 0.00 0.00
1.40
1.94 0.89 95.53
1.41
```
Disable LTR 8:
```
$ sudo cat /sys/kernel/debug/pmc_core/ltr_show
0 PMC0:SOUTHPORT_A LTR: RAW: 0x8460846
Non-Snoop(ns): 0 Snoop(ns): 0
1 PMC0:SOUTHPORT_B LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
2 PMC0:SATA LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
3 PMC0:GIGABIT_ETHERNET LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
4 PMC0:XHCI LTR: RAW: 0x88a0
Non-Snoop(ns): 0 Snoop(ns): 163840
5 PMC0:Reserved LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
6 PMC0:ME LTR: RAW: 0xc000c00
Non-Snoop(ns): 0 Snoop(ns): 0
7 PMC0:EVA LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
8 PMC0:SOUTHPORT_C LTR: RAW: 0x89f489f4
Non-Snoop(ns): 512000 Snoop(ns): 512000
9 PMC0:HD_AUDIO LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
10 PMC0:LPSS LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
11 PMC0:SOUTHPORT_D LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
12 PMC0:SOUTHPORT_E LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
13 PMC0:CAMERA LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
14 PMC0:ESPI LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
15 PMC0:SCC LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
16 PMC0:ISH LTR: RAW: 0x0
Non-Snoop(ns): 0 Snoop(ns): 0
17 PMC0:CURRENT_PLATFORM LTR: RAW: 0x40201
Non-Snoop(ns): 0 Snoop(ns): 0
18 PMC0:AGGREGATED_SYSTEM LTR: RAW: 0x3eca251
Non-Snoop(ns): 0 Snoop(ns): 593
$ echo 8 | sudo tee /sys/kernel/debug/pmc_core/ltr_ignore
8
```
and test again:
```
$ sudo turbostat --quiet --show
CPU%c1,CPU%c6,CPU%c7,GFX%rc6,Pkg%pc2,Pkg%pc3,Pkg%pc6,Pkg%pc7,Pkg%pc8,Pkg%pc9,Pk%pc10,SYS%LPI
rtcwake -m freeze -s 10
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "freeze" using /dev/rtc0 at Fri Jun 14 09:06:29 2024
11.025682 sec
CPU%c1 CPU%c6 CPU%c7 GFX%rc6 Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 Pkg%pc8
Pkg%pc9 Pk%pc10 SYS%LPI
1.45 0.57 96.39 1273.23 3.08 0.31 0.08 0.01 1.54 0.00 90.76 0.00
1.25 0.39 96.47 1273.21 3.08 0.31 0.08 0.01 1.54 0.00 90.76 0.00
1.90
1.48 0.75 96.31
1.16
```
Daniel Holz (Bcc) with a similar Dell XPS 13 9365 (also Kaby Lake)
reports similar issues [3].
Does somebody have an idea?
Kind regards,
Paul
[1]: https://review.coreboot.org/c/coreboot/+/81595/10/src/mainboard/cwwk/adl/Kconfig#9
[2]: https://wiki.ubuntu.com/FirmwareTestSuite/
[3]: https://bugzilla.kernel.org/show_bug.cgi?id=207893
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)
[…]
