Public bug reported:
Ubuntu Server 24.10
Linux ubuntu 6.11.0-1004-raspi #4-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27
22:25:34 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux
We're seeing that following a kernel panic and reboot, the PCI fails to
initialize correctly and associated devices (such as Wi-Fi card) are
not available.
Issue Description:
• On the first boot, everything works correctly.
• However, after a Kernel Panic, the device reboots, but PCIe does not
reset or re-initialize properly.
• When this happens:
o The Wi-Fi card is not recognized.
o The lspci command shows no PCI devices.
o The dmesg log includes the message:
[ 0.591441] brcm-pcie fd500000.pcie: link down
• A soft reboot does not fix the issue.
• The only way to recover is to completely remove and reconnect power
(hard reboot).
We have tried modifying /boot/firmware/config.txt and
/boot/firmware/cmdline.txt, which has reduced but not fully resolved the issue.
How to Reproduce The Problem:
1. Power up the hardware
2. Run ‘lspci’ – observe the result includes the PCI Bridge and Wi-Fi card
3. Trigger a kernel panic with the command ‘echo c | sudo tee
/proc/sysrq-trigger’, causing a reboot
4. Run ‘lspci’ – observer the output is now empty
The same issue does not occur on Raspberry Pi OS - it seems to be specific to
Ubuntu.
Any assistance/guidance on how to troubleshoot this would be much
appreciated!
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "apport info"
https://bugs.launchpad.net/bugs/2099935/+attachment/5860222/+files/CM4-PCI-MISSING-AFTER-KERNEL-PANIC.apport
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https://bugs.launchpad.net/bugs/2099935
Title:
PCI initialization failure following kernel panic reboot on Raspberry
Pi CM4
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