[Bug 2144584] Re: Multiple PM Regressions on ASUS Z790/RTX 4070 Ti: Suspend freeze, UCSI (INT3515) IRQ failure, and Display recovery hang

** Summary changed:

- Suspend/Hibernate missing from GNOME menu and causing hard freeze due to Kernel Lockdown (Secure Boot)
+ Multiple PM Regressions on ASUS Z790/RTX 4070 Ti: Suspend freeze, UCSI (INT3515) IRQ failure, and Display recovery hang

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Title:
Multiple PM Regressions on ASUS Z790/RTX 4070 Ti: Suspend freeze, UCSI
(INT3515) IRQ failure, and Display recovery hang

Status in linux package in Ubuntu:
New

Bug description:
Summary: System-wide Power Management failure on ASUS Z790 + NVIDIA
RTX 4070 Ti, leading to hard lockups, non-functional USB-C ports, and
display recovery failure.

Environment:

    OS: Ubuntu 26.04 "Resolute Raccoon" (Development Branch)

    Kernel: 6.19.0-9-generic

    Motherboard: ASUS ROG MAXIMUS Z790 HERO (BIOS 3001)

    GPU: NVIDIA GeForce RTX 4070 Ti (Driver: 580.126.09)

    Secure Boot: Enabled (Kernel Lockdown active)

Symptoms:

    Hard Lockup: System freezes instantly when attempting to Suspend
or Hibernate. Requires physical hard reset.

    Display Recovery Failure: If the monitor is manually turned OFF
and back ON (or switched to another input), the screen remains black.
SSH access remains functional, confirming a GPU/Driver hang rather
than a kernel panic.

    USB-C Failure: All USB Type-C ports are non-functional in Ubuntu.

    UI Regression: The 'Suspend' option is often missing or
unresponsive in the GNOME power menu.

Technical Root Causes Found:

    UCSI / IRQ Conflict: The kernel log shows a critical failure in the serial bus driver:
    Serial bus multi instantiate pseudo device driver INT3515:00: error -ENXIO: IRQ index 1 not found.
    This appears to be the root cause, as the UCSI (USB Type-C Connector System Software Interface) is tied to the system's power state transitions.

    EDID Mismatch: While the monitor is active, cat
/sys/class/drm/card1-DP-1/edid returns 0 bytes. However, valid EDID
data (384 bytes) was found on card1-DP-3. This suggests a mapping
regression between physical ports and logical DRM outputs.

    Lockdown Interference: Kernel Lockdown restricts hibernation, but
the system fails to handle this restriction gracefully, leading to a
freeze instead of a denied request.

Evidence of Regression:

    Dual-Boot Verification: All hardware (USB-C ports, Suspend/Resume,
DisplayPort link) works perfectly on Windows on the same machine. This
confirms the hardware is functional and the issue is strictly a Linux
kernel/driver regression.

    NVIDIA Tooling Failure: nvidia-settings is non-functional under
Wayland/Kernel 6.19, returning multiple "Bad handle" errors,
preventing standard diagnostic procedures.

Steps to Reproduce:

    Boot into Ubuntu with Secure Boot active.

    Turn the monitor OFF and then ON via the physical power button
(causes Black Screen).

    OR attempt to Suspend via terminal/UI (causes Hard Freeze).

Attached Logs:

    nvidia-bug-report.log.gz (Detailed GPU/Driver state)

    acpidump.txt (ACPI tables for ASUS Z790)

    /proc/interrupts (Showing the IRQ 1 conflict)

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