Re: [REGRESSION][BISECTED] Dell Precision 7780 wakes up on its own from suspend

Askar Safin
2025-09-18T18:35:30Z

Andy Shevchenko:
> In other words we need to enable debug of the pin control subsystem and see
> what it will print in dmesg.

You mean I should enable CONFIG_DEBUG_PINCTRL? Okay, I did this.

So, today I tested everything on fresh kernel, 6.17.0-rc6, without any
patches.

My config is: https://zerobin.net/?ebecc538f6caa22b#88c2k08G8+cZoMjgU9N/WYy28qQjyBW+/H78ygujZxY=
It was generated from Debian config using localmodconfig.
I added few tweaks, in particular I enabled CONFIG_DEBUG_PINCTRL.

# cat /proc/cmdline
BOOT_IMAGE=/@rootfs/boot/vmlinuz-6.17.0-rc6 root=UUID=015793d4-ad51-4da7-844b-fcc3bcb13a0b ro rootflags=subvol=@rootfs log_buf_len=4M ignore_loglevel

I run this script:
https://zerobin.net/?327f3aa3ef7ce845#Ycu017J9YbRga8uGaCKRzsH7J/lB8D4RudpwTll5lbo=

This script runs "rtcwake -s 6 -m mem" multiple times. Sometimes my laptop wakes on timer (because of rtcwake),
and sometimes it wakes up too early on its own (and this is a bug).

My script did suspend 7 times:

# dmesg | grep s2idle
[ 117.934504] PM: suspend entry (s2idle)
[ 127.141741] PM: suspend entry (s2idle)
[ 131.299554] PM: suspend entry (s2idle)
[ 140.034802] PM: suspend entry (s2idle)
[ 144.592260] PM: suspend entry (s2idle)
[ 154.038621] PM: suspend entry (s2idle)
[ 163.034299] PM: suspend entry (s2idle)

Out of them my laptop woke up on timer 4 times and on its own (i. e. due to bug) 3 times:

# dmesg | grep 'woke up'
[ 126.087936] will-wake: attempt 0: woke up in time
[ 130.248820] will-wake: attempt 1: woke up early
[ 138.988770] will-wake: attempt 2: woke up in time
[ 143.545973] will-wake: attempt 3: woke up early
[ 152.993654] will-wake: attempt 4: woke up in time
[ 161.988956] will-wake: attempt 5: woke up in time
[ 166.329080] will-wake: attempt 6: woke up early

Here is full output of "dmesg --level=debug+":
https://zerobin.net/?f704a2d56603f4ec#SRrzc2mt2FNNqcltx/ULmtLZRdRH9frdgoODU03AXwE=

/proc/interrupts:
https://zerobin.net/?b7ba5047ca84ab29#TjMUjkAdhpIuKbnvPpuYyNWa/ilA/ciGKwwSbx6KRFc=

# head -n 1000 /sys/class/dmi/id/*
==> /sys/class/dmi/id/bios_date <==
07/15/2025

==> /sys/class/dmi/id/bios_release <==
1.23

==> /sys/class/dmi/id/bios_vendor <==
Dell Inc.

==> /sys/class/dmi/id/bios_version <==
1.23.6

==> /sys/class/dmi/id/board_asset_tag <==

==> /sys/class/dmi/id/board_name <==
0C6JVW

==> /sys/class/dmi/id/board_serial <==
/JNLHW44/VNCMV0046P029A/

==> /sys/class/dmi/id/board_vendor <==
Dell Inc.

==> /sys/class/dmi/id/board_version <==
A00

==> /sys/class/dmi/id/chassis_asset_tag <==

==> /sys/class/dmi/id/chassis_serial <==
JNLHW44

==> /sys/class/dmi/id/chassis_type <==
10

==> /sys/class/dmi/id/chassis_vendor <==
Dell Inc.

==> /sys/class/dmi/id/chassis_version <==

==> /sys/class/dmi/id/ec_firmware_release <==
1.18

==> /sys/class/dmi/id/modalias <==
dmi:bvnDellInc.:bvr1.23.6:bd07/15/2025:br1.23:efr1.18:svnDellInc.:pnPrecision7780:pvr:rvnDellInc.:rn0C6JVW:rvrA00:cvnDellInc.:ct10:cvr:sku0C42:

==> /sys/class/dmi/id/power <==
head: error reading '/sys/class/dmi/id/power': Is a directory

==> /sys/class/dmi/id/product_family <==
Precision

==> /sys/class/dmi/id/product_name <==
Precision 7780

==> /sys/class/dmi/id/product_serial <==
JNLHW44

==> /sys/class/dmi/id/product_sku <==
0C42

==> /sys/class/dmi/id/product_uuid <==
4c4c4544-004e-4c10-8048-cac04f573434

==> /sys/class/dmi/id/product_version <==

==> /sys/class/dmi/id/subsystem <==
head: error reading '/sys/class/dmi/id/subsystem': Is a directory

==> /sys/class/dmi/id/sys_vendor <==
Dell Inc.

==> /sys/class/dmi/id/uevent <==
MODALIAS=dmi:bvnDellInc.:bvr1.23.6:bd07/15/2025:br1.23:efr1.18:svnDellInc.:pnPrecision7780:pvr:rvnDellInc.:rn0C6JVW:rvrA00:cvnDellInc.:ct10:cvr:sku0C42:

Output of dmidecode:
https://zerobin.net/?e7783ba3bd93c895#EAVgKSZQrn0aGC6t9a/RKeZpp1/9TAYlDhHMh2lcpfQ=

--
Askar Safin