Public bug reported:
Hotplugging as is or after adding grub parameter "intel_iommu=on"
hotplug on drives stops working - unplugging works fine, the devices
disappear without issue but when I hot plug them in, they do not always
reappear back. Rebooting the machine restores the drives. Removing
"intel_iommu=on" or using "intel_iommu=off" fixes the issue. In BIOS
Hotplug and VMD were enabled.
Since adding "intel_iommu=on" in grub has no effect, I assume it is on
by default.
Doing hotplug few times (even with wait time between the plugs) will
cause the OS to hang completely requiring force reset.
Another workaround is to add "iommu=pt".
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-42-generic 7.0.0-42.42
ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14
Uname: Linux 7.0.0-42-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/seq: user 34901 F.... pipewire
CasperMD5CheckResult: pass
Date: Wed Nov 4 15:56:24 2026
InstallationDate: Installed on 2026-11-04 (0 days ago)
InstallationMedia: Ubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826)
MachineType: Intel Corporation BeechnutCity
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm
XDG_RUNTIME_DIR=<set>
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-42-generic
root=UUID=f738f84f-7ae7-49c5-97e0-dab197e7a2bc ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/30/2024
dmi.bios.vendor: Intel Corporation
dmi.bios.version: BHSDREL1.IPC.0034.D65.2407302228
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: BeechnutCity
dmi.board.vendor: Intel Corporation
dmi.board.version: 0.02
dmi.chassis.asset.tag: ....................
dmi.chassis.type: 23
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: ............
dmi.modalias:
dmi:bvnIntelCorporation:bvrBHSDREL1.IPC.0034.D65.2407302228:bd07/30/2024:svnIntelCorporation:pnBeechnutCity:pvr....................:rvnIntelCorporation:rnBeechnutCity:rvr0.02:cvnIntelCorporation:ct23:cvr............:skuSKUNumber:pfaFamily:
dmi.product.family: Family
dmi.product.name: BeechnutCity
dmi.product.sku: SKU Number
dmi.product.version: ....................
dmi.sys.vendor: Intel Corporation
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
** Attachment added: "Additional logs, platform information"
https://bugs.launchpad.net/bugs/2172971/+attachment/6014910/+files/Ubuntu_26.04.1-2026.10.29.zip
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https://bugs.launchpad.net/bugs/2172971
Title:
Hotplug doesnt work as expected
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