Re: pinctrl: amd: spurious immediate resume from S3/s2idle via BIOS-armed wake GPIO with no ACPI owner (Lenovo Legion Pro 5 16ARX8)

[Lenart Kos]

I have checked all the bios settings and the closest to modifying
sleep behaviour was a setting that enables opening the lid turning on
the laptop which was already disabled, so no, there are no sleep
settings.

Regarding the HDMI port, it is connected to the Nvidia card. Only the
built-in screen is connected to the AMD card with eDP. I have not
reported this anywhere else yet, only here and the before mentioned
forum post. If this is an Nvidia issue I can report it to them as
well.

The HPD theory is pure guesswork done by LLM. What I can be certain of
is that disabling those specific pins
(https://github.com/Lenart12/legion-nowake/blob/6b599aad7afd1431e81048273106c5526561764b/legion_nowake.c#L59-L62)
did solve the problem, as to why and in what way, I would not bet on.
So the statements about HPD and your questions about them are maybe in
vain. What would be the best way to figure out if HPD is actually
attached to those pins?

FWIW I think that it is in fact not HPD as I have checked the GPIO
states when the monitor cable is connected or not and it seems to be
gpio #131 not #2 or #4. I have asked Claude to expand on what it knows
and what it assumes, this may be of help to you:
---
What I have measured (facts):
* The resume is triggered by the AMD GPIO controller:
/sys/power/pm_wakeup_irq = 7 (pinctrl_amd), and the post‑resume log
shows GPIO 4 is active: 0x30057c00 with the wake‑status bit latched
and the S3 wake‑enable bit (bit 14) set.
* In /sys/kernel/debug/gpio, pins #2 and #4 are the only pins with
S0i3/S3 wake‑enable bits set and an interrupt enabled. (Pin #89 has an
interrupt but no wake bits — not a wake source.)
* These wake bits have no ACPI owner: decompiling the DSDT and all 16
SSDTs yields zero GpioInt / GpioIo / _AEI resources. Nothing in ACPI
references these pins.
* Empirically: suspend instant‑wakes only when an external display is
connected (reproduced over both HDMI and USB‑C/DP); with no display,
suspend holds. In the HDMI case, pin #4 is the one that latches the
wake.
* Clearing the S‑state wake‑enable bits (13/14/15) on pins #2 and #4
fixes it (verified across multiple suspends). Interrupt‑enable bits
left intact; no other wake source touched.
* GPIO #131 is the actual monitor‑presence line — its level cleanly
tracks plug/unplug (active‑low: LOW when a monitor is attached, HIGH
when not, confirmed across plug→unplug→replug). But #131 has no
interrupt and no wake bits — it does not wake the system.
* Pins #2 and #4 do not change level when the monitor is
plugged/unplugged (both steady while awake).

What I am inferring (not proven):
* Because #4's level is steady while awake yet the wake only occurs
with a display connected, my working model is that #4 transitions
during the dGPU's suspend power‑down sequence, and that transition
only happens when the dGPU was actively driving an external display.
This is a plausible explanation of the display correlation, not a
verified one.
* The precise electrical function of pins #2/#4 is unknown without
schematics or a scope. They are not the monitor‑presence/HPD line
(that is the unarmed #131). I previously guessed "HPD"; the #131 data
contradicts that, so I'm withdrawing it.

Unknown: what #2/#4 physically are, and why the firmware arms them as
sleep wake sources with no ACPI description.

Net: a bare, firmware‑armed pinctrl-amd wake pin with no ACPI
description, which no existing in‑tree mechanism can disarm
(gpiolib_acpi.ignore_wake= needs an ACPI event; power/wakeup needs a
device owner; /dev/mem is blocked by IO_STRICT_DEVMEM).
---

I have not filed a bugzilla report yet.

I hope I addressed your questions.

On Wed, Jun 10, 2026 at 10:23 PM Mario Limonciello
<mario.limonciello@xxxxxxx> wrote:
>
>
>
> On 6/10/26 15:18, Lenart Kos wrote:
> > Thanks for taking your time for this. To answer your questions:
> >
> > S3 path:
> > AFAIK it was on [deep] since my system was installed and I strongly
> > remember being it as so, although it is possible that I misremembered
> > since I have been debugging this sleep issue since January. In any
> > case I have also tried setting sleep to [s2idle] before and it did not
> > fix the waking issue even if set in s2 sleep mode.
> > The firmware is not modified, everything is installed from Fedora
> > sources without modification.
>
> Can you please check in Lenovo's BIOS setup if there is a sleep mode for
> this platform?  If there isn't that's fine, I want to confirm what
> Lenovo actually presented before making further assumptions.
>
> If there is such a setting, what options does it offer?  If you change
> it does the behavior change?
>
> Furthermore if this issue is only happening when connected to the HDMI
> port, that's the one connected to NVIDIA, right?  Have you started a
> conversation with them?  Assuming the HPD theory that has been presented
> is correct their driver should be in control of HPD behavior.
>
> >
> > Methodology:
> > Yes you are correct about LLMs, I have thrown every bit of my
> > knowledge and time that I have available for this without success and
> > Claude has finally solved this after a few months being irritated by
> > this. I had decided to forward most of the information I received from
> > LLM in the hopes it was useful to an expert in the area, but in
> > hindsight I can see this was a mistake without AI disclosure, I'm
> > sorry. So for your other questions regarding why this assumption was
> > made or why was something done a certain way - I don't know, but I am
> > willing to assist with testing. Apologies for this mess, it's my first
> > time filing a bug to the LKML.
>
> No worries; as long as I'm talking to a human about a problem not an
> LLM, I'm fine to work with you to see what we can come up with for a
> solution.
>
> I've got various inline comments/questions below.  Can you please
> address them?
>
> >
> > On Wed, Jun 10, 2026 at 9:59 PM Mario Limonciello
> > <mario.limonciello@xxxxxxx> wrote:
> >>
> >> First off -
> >>
> >> How did you get into an S3 path?  These systems that ship with only
> >> Modern Standby / s2idle normally shouldn't be able to get into S3.
> >>
> >> ╰─❯ cat /sys/power/mem_sleep
> >> [s2idle]
> >>
> >> Have you modified the firmware in some way to try to enable an
> >> unvalidated path?
> >>
> >> I have some more questions about your methodology below because when
> >> debugging a kernel issue an LLM can sometimes make WILD assumptions that
> >> are totally a house of cards.
> >>
> >> On 6/10/26 14:32, Lenart Kos wrote:
> >>> ## Summary
> >>>
> >>> On the Lenovo Legion Pro 5 16ARX8, suspending (S3 *or* s2idle) with an external
> >>> display connected resumes the machine after ~1 second. The wake is delivered by
> >>> the AMD GPIO controller (`pinctrl_amd`, IRQ 7) from GPIO pin **#4**
> >>> (and pin #2 for
> >>> the USB‑C/DP path), which the **BIOS has armed as an S0i3/S3 wake
> >>> source directly
> >>> in the FCH GPIO register**, with **no ACPI description**
> >>> (`_AEI`/`GpioInt`/`_PRW`)
> >>> anywhere in the DSDT or the 16 SSDTs. Because there is no ACPI owner,
> >>> none of the
> >>> existing override mechanisms (`gpiolib_acpi.ignore_wake=`, device
> >>> `power/wakeup`)
> >>> can reach it, and `IO_STRICT_DEVMEM` blocks any userspace register
> >>> write. The pin
> >>> is an external‑display HPD line, so the edge produced while the GPU
> >>> powers down on
> >>> the way into sleep immediately wakes the system.
> >>>
> >>> ## Affected system
> >>>
> >>> ```
> >>> DMI sys_vendor LENOVO
> >>> DMI product_name 82WM
> >>> DMI product_version Legion Pro 5 16ARX8
> >>> DMI board_name LNVNB161216
> >>> BIOS LPCN62WW (2025-06-17) # latest available; does NOT fix this
> >>> SoC AMD Ryzen 7 7745HX (Raphael), GPIO ctrl AMDI0030 @ 0xFED81500
> >>> GPU NVIDIA RTX 4060 Mobile (HDMI) + AMD Raphael iGPU (USB-C DP)
> >>> Kernel 6.17+ through 7.0.x (reproduced on Fedora 43/44)
> >>> ```
> >>>
> >>> ## Symptom / evidence
> >>>
> >>> Failed-suspend kernel log (verbose PM):
> >>> ```
> >>> PM: suspend entry (deep)
> >>> ...
> >>> amd_gpio AMDI0030:00: ... Clearing debounce for GPIO #2 during suspend.
> >>> amd_gpio AMDI0030:00: ... Clearing debounce for GPIO #4 during suspend.
> >>> amd_gpio AMDI0030:00: ... Disabling GPIO #89 interrupt for suspend. #
> >>> not a wake src
> >>> ACPI: PM: Preparing to enter system sleep state S3
> >>> Timekeeping suspended for 1.384 seconds
> >>> PM: Triggering wakeup from IRQ 7 # IRQ 7 = pinctrl_amd
> >>> ...
> >>> GPIO 4 is active: 0x30057c00 # bit 14 (WAKE_CNTRL_S3) + bit 29 (wake latched)
> >>> ```
> >>> `/sys/power/pm_wakeup_irq` = `7`.
> >>>
> >>> `/sys/kernel/debug/gpio` (relevant rows) shows pins #2 and #4 armed for S0i3+S3
> >>> wake with their interrupt enabled, while #89 has no wake bits:
> >>> ```
> >>> #2 😛| ↓ | edge |⏰|⏰| | | ... 0x147ae0
> >>> #4 😛| b | edge |⏰|⏰| | | ... 0x57ce0 <- both-edge HPD, S0i3+S3 wake set
> >>
> >> How did you determine this is an HPD line?  Is that a pure guess?  Or
> >> did you look at a schematic/trace etc?
> >>
> >>> #89 😛| ↓ | level| | | | | ... 0x151b00 <- no wake bits (red herring)
> >>> ```
> >>>
> >>> ## Root cause
> >>>
> >>> 1. The external‑display HPD lines are routed to SoC GPIO #2 (USB‑C/DP) and #4
> >>> (HDMI/dGPU).
> >>
> >> How do you know?
> >>
> >>> 2. The BIOS sets `WAKE_CNTRL_S0I3`/`WAKE_CNTRL_S3` (bits 13/14) on
> >>> those pins in the
> >>> FCH GPIO register block and **never describes them in ACPI** — decompiling the
> >>> DSDT and all 16 SSDTs yields **zero** `GpioInt`/`GpioIo`/`_AEI` resources.
> >>> 3. `pinctrl_amd` correctly preserves hardware-armed wake pins across
> >>> suspend, so the
> >>> HPD edge generated during the suspend transition wakes the system immediately.
> >>>
> >>> This is effectively an unvalidated firmware S3 path (the platform ships as
> >>> Modern-Standby-only); but note **both** the S0i3 and S3 wake bits are set, so
> >>> s2idle is affected too.
> >>
> >> So how did you get into S3?
> >>
> >>>
> >>> ## Why existing mechanisms don't help
> >>>
> >>> - `/proc/acpi/wakeup`, PCI/ACPI `power/wakeup` — wrong layer; this is
> >>> not a PCIe PME.
> >>> Disabling wakeup on the GPP bridges / GPU has no effect (verified).
> >>> - `gpiolib_acpi.ignore_wake=` / `ignore_interrupt=` — only match
> >>> **ACPI-declared**
> >>> GPIO events; this pin has no ACPI declaration, so they cannot target it.
> >>> - `/dev/mem` register write — blocked by `CONFIG_IO_STRICT_DEVMEM=y`
> >>> (the region is
> >>> claimed by pinctrl_amd).
> >>>
> >>> There is currently **no way, in-tree, to disarm a bare (non-ACPI) firmware-armed
> >>> pinctrl-amd wake pin.** That is the gap.
> >>>
> >>> ## Suggested fix (maintainers' choice)
> >>>
> >>> A working out-of-tree reference implementation (clears bits 13/14/15
> >>> on pins #2/#4
> >>> at probe and on `PM_SUSPEND_PREPARE`) is here:
> >>> **https://github.com/Lenart12/legion-nowake** — please feel free to reuse.
> >>
> >> Why not use /dev/gpiochipX devices to change GPIOs?
> >>
> >>>
> >>> Possible in-tree directions:
> >>> 1. **DMI-matched quirk in `pinctrl-amd`** that clears the S-state
> >>> wake-enable bits
> >>> for the affected pins at probe (smallest change; precedent exists for AMD GPIO
> >>> wake quirks).
> >>> 2. **A generic override** for bare pins, e.g. a
> >>> `pinctrl_amd.ignore_wake=<pin,...>`
> >>> module parameter, analogous to `gpiolib_acpi.ignore_wake=` but for
> >>> hardware-armed
> >>> pins without ACPI events. This would help the broader class of AMD laptops that
> >>> hit firmware-armed spurious wakes.
> >>>
> >>> ## Reproduction
> >>>
> >>> 1. AMD laptop where a display HPD is wired to a GPIO the BIOS arms for wake.
> >>> 2. Connect an external monitor, `systemctl suspend`.
> >>> 3. Observe resume after ~1s; `pm_wakeup_irq` = the `pinctrl_amd` IRQ;
> >>> the offending
> >>> pin shows `wake latched` in the post-resume `GPIO N is active` log.
> >>
> >> On the presumption that this is correct about being an HPD pin doesn't
> >> this actually point at a GPU driver bug?
> >>
> >>>
> >>> ## Public discussion / full diagnostics
> >>>
> >>> Fedora Discussion (complete diagnostic walkthrough, ACPI dumps, gpio table):
> >>> https://discussion.fedoraproject.org/t/immediate-wake-from-s3-sleep-when-hdmi-is-connected-irq-7-pinctrl-amd
> >>>
> >>> ## Attachments to include when filing
> >>>
> >>> - `acpidump` output (or note: DSDT + all SSDTs contain no GpioInt/_AEI).
> >>> - Full verbose-PM `dmesg` of one failed suspend (`pm_debug_messages=1`).
> >>> - `sudo cat /sys/kernel/debug/gpio`.
> >>> - `cat /sys/class/dmi/id/{sys_vendor,product_name,product_version,board_name,bios_version}`.
> >>
> >> Where is the kernel bugzilla that you attached all these artifacts?
> >>
> >
> >
>


-- 
Lep pozdrav,
Lenart Arvo Kos