[Bug 221778] New: [REGRESSION 6.12→6.18] ASUS N-KEY keyboard (0b05:19b6) USB resets ~1/sec under dGPU rendering load on Raphael xHCI

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221778

            Bug ID: 221778
           Summary: [REGRESSION 6.12→6.18] ASUS N-KEY keyboard (0b05:19b6)
                    USB resets ~1/sec under dGPU rendering load on Raphael
                    xHCI
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: high
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: m.langas55@gmail.com
        Regression: No

Hardware: ASUS ROG Strix G16 G614PM (AMD variant: Raphael iGPU + RTX 5060
Laptop dGPU), BIOS G614PM.316 (latest from ASUS).
Internal keyboard: ASUS "N-KEY Device", USB 0b05:19b6, hid-asus driver,
attached to usb 3-1 on the AMD Raphael xHCI controller (1022:15b6/15b7).

Summary: since 6.18, rendering load on the Nvidia dGPU causes the
internal keyboard's USB device to reset ~once per second
("usb 3-1: reset full-speed USB device" in dmesg — 4,557 resets in one
8h boot). The resets corrupt input below userspace: evtest on
/dev/input/event3 shows missed key presses, releases arriving seconds
late, and missing autorepeat. In games this manifests as stuck/dropped
WASD keys.

Trigger isolation:
- iGPU rendering with dGPU powered but idle: CLEAN (tested via
  supergfxctl Integrated mode).
- dGPU rendering by application: resets begin
  immediately (70 resets in the first ~2 min after game launch).

Kernels tested:
- 6.12.75 (Arch linux-lts): CLEAN — 0 resets in a full game session.
- 6.18.38 (cachyos-lts): BROKEN.
- 7.1.4 (cachyos): BROKEN (retested 2026-07-22).

Ruled out: EC reset (no effect), BIOS (already latest), hardware
(machine is clean on 6.12).

Distro: CachyOS (Arch-based, rolling). Nvidia driver 610.43.03 via
nvidia-open-dkms.

Multiple users with G614/G615 models report identical symptoms on the
same 0b05:19b6 device:
-
https://discuss.cachyos.org/t/keyboard-input-issues-on-asus-rog-strix-16-2025-with-cachyos-during-gaming/30823
- https://github.com/ublue-os/bazzite/issues/4590

I will be away from this machine until ~2026-07-24; I can respond to
questions and run tests after that. Other affected users are active in
the CachyOS thread linked above and may be able to test sooner.

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