Confirming the same issue on an Arrow Lake laptop with VMD 8086:7d0b (Ubuntu
26.04.1, kernel 7.0.0-31-generic): frequent "nvme: I/O ... timeout,
completion polled" events causing 30 s – 2 min application stalls. APST off,
C-state limits, kernel/BIOS/firmware updates did not help.
Applying Rickey Bartlett's "PCI: vmd: Flush initiator posted writes before
demuxing interrupts on Meteor Lake" (pci.git controller/vmd) to Ubuntu's vmd.c
via DKMS fixed it completely: 0 events, I/O pressure from ~40% to ~0%. Please
consideran SRU cherry-pick for 7.0.x.
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https://bugs.launchpad.net/bugs/2166325
Title:
Intel VMD 8086:ad0b: Bus Offset 3 prevents NVMe enumeration and ARL004
causes NVMe completion stalls
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