Public bug reported:
Summary:
Raspberry Pi 5 with NVMe M.2 storage via PCIe hat experiences buffer I/O errors
and complete device unresponsiveness 10-15 seconds after boot on kernel
7.0.0-1015-raspi. The system becomes unusable and requires power cycle to
recover (piboot-try rolls back to 6.17 kernel).
Details:
After upgrading from Ubuntu 25.10 (kernel 6.17.0-1021-raspi) to 26.04 (kernel
7.0.0-1015-raspi), NVMe read/write operations fail consistently:
* Kernel logs show: Buffer I/O error on dev nvmeon1p1, logical block 1, lost
async page write
* Device becomes unmounted and unresponsive ~10-15 seconds into boot
* Only workaround: add pcie_aspm=off to kernel boot parameters
Root Cause (I think):
Kernel 7.0 enables ASPM L1 state on NVMe device (config change from 6.17):
* Previous kernel: No ASPM L1 state configured
* 7.0 kernel: Shows pci 0001:01:00.0: ASPM: default states L1
* Also sets nvme nvme0: D3 entry latency set to 10 seconds
The 10-second D3 entry latency coincides closely with the failure window
(10-15s), suggesting power state transition issue on PCIe link.
Steps to Reproduce:
* Raspberry Pi 5 with official power supply
* NVMe M.2 in PCIe hat (M.2 Key-M to PCIe adapter)
* Boot with kernel 7.0.0-1015-raspi without boot parameter workaround
* Observe buffer I/O errors ~10-15 seconds after boot
Expected Behavior:
NVMe device remains accessible and stable throughout boot and operation (as
with 6.17 kernel).
Actual Behavior:
NVMe I/O fails, device unmounts, system requires power cycle.
Workaround:
Add pcie_aspm=off to kernel boot parameters (in /boot/firmware/cmdline.txt or
/boot/firmware/new/cmdline.txt).
System Information:
Hardware: Raspberry Pi 5 Model B Rev 1.1
Storage: NVMe M.2 via PCIe hat
Kernel (broken): 7.0.0-1015-raspi #15-Ubuntu SMP PREEMPT_DYNAMIC
Kernel (working): 6.17.0-1021-raspi #21-Ubuntu SMP PREEMPT_DYNAMIC
OS: Ubuntu 26.04 (ARM64)
linux-raspi version: 7.0.0-1015.15
Kernel Configuration Changes (6.17 → 7.0):
* CONFIG_PREEMPT changed to CONFIG_PREEMPT_LAZY
* CONFIG_NUMA enabled (was disabled)
* CONFIG_POWER_SEQUENCING changed from module to builtin
* CONFIG_POWER_SEQUENCING_PCIE_M2 added
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
** Tags: aspm l1 linux-raspi m.2 nvme nvme-hat pi5
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https://bugs.launchpad.net/bugs/2162033
Title:
NVMe M.2 fails with I/O errors on Raspberry Pi 5 with kernel
7.0.0-1015-raspi when ASPM L1 is enabled
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