Hi,
Following up on bug #1145628 with additional testing, a better full-speed
workaround, and distribution comparison:
1. High-Speed Workaround ('swcrypto=1' instead of '11n_disable=1'):
In the original report, '11n_disable=1' was suggested. However, further
testing revealed that enabling software cryptography:
/etc/modprobe.d/iwlwifi.conf:
options iwlwifi swcrypto=1 power_save=0
options iwlmvm power_scheme=1
routes WPA encryption through the CPU's hardware AES-NI instructions
rather than the on-chip CNVi microcode engine. This completely prevents the
'NMI_INTERRUPT_UNKNOWN' and 'timeout waiting for FW reset ACK' bus
deadlocks while preserving full 802.11ac high-speed throughput (no
throttling to 54/150 Mbps).
2. Distribution Regression Context (Ubuntu 24.04 LTS vs. Debian 13):
This exact laptop hardware previously ran Ubuntu 24.04 LTS (Linux Kernel
6.8) for extended periods under heavy multi-stream network traffic with
zero freezes. The issue specifically reproduces on Debian 13 with Linux
Kernel 6.12 when using hardware cryptography on the Intel AC 9560 CNVi
(JF-B0) companion module.
3. PCIe ASPM Interaction:
Removing forced 'pcie_aspm.policy=performance' restored default dynamic
PCH power management, preventing CNVio bus clock desynchronization during
high-concurrency DMA bursts.
Thank you!
On Wed, 26 Aug 2026 at 09:33, Debian Bug Tracking System <
[email protected]> wrote:
> Thank you for filing a new Bug report with Debian.
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> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1145628.
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> 1145628: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1145628
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