Public bug reported:
Thanks in advance for taking a look.
The webcam on my X1 Nano (Gen 2, OV2740 behind IPU6) worked on a clean
Ubuntu 26.04 install. After a routine `apt upgrade` rolled the HWE
kernel forward to 7.0.0-14 and then 7.0.0-15, it stopped producing
frames. Nothing else camera-related changed in that upgrade.
On the surface everything still looks fine. libcamera and pipewire both
see an `ov2740` device. /dev/video* are populated. The IPU6 driver is
happy:
intel-ipu6 0000:00:05.0: Found supported sensor INT3474:01
intel-ipu6 0000:00:05.0: Connected 1 cameras
But every app that tries to open the camera fails the same way:
spa.v4l2: /dev/video0: VIDIOC_S_PARM: Inappropriate ioctl for device
spa.v4l2: '/dev/video0' VIDIOC_STREAMON: Link has been severed
Cheese, Firefox, Chromium and Zoom all behave identically. BIOS privacy
is off and the FN-toggle has been checked.
I'm not sure I'm reading this right, but it looks like the VSC chain
might not be coming up. `mei_vsc_hw` is loaded but unbound. `mei_vsc`,
`intel_vsc`, `ivsc_csi`, `ivsc_ace` aren't loaded at all. The ov2740
probe complains about missing rails (AVDD/DOVDD/DVDD, "supply X not
found, using dummy regulator"), which I think the VSC normally provides.
Tracing back, the ACPI path looks like:
\_SB_.PC00.SPI1.SPFD HID INTC1094
\_SB_.PC00.SPI1.SPFD.CVFD HID INTC1095
`INTC1094` is one of `mei_vsc_hw`'s alias matches. But the parent device
for `\_SB_.PC00.SPI1` shows an empty `_HID` in /sys, so I don't think
the kernel is instantiating a SPI controller on that node. If that's
right, INTC1094 and INTC1095 never become spi_devices and `mei_vsc_hw`
has nothing to bind to. That's my best guess at where it falls over, but
I could easily be off.
A couple of side notes in case they matter:
* The PCH SPI controller (PCI 0000:00:1f.5, spi0) has one child for the BIOS
flash. spi-nor fails JEDEC identification on it ("unrecognized JEDEC id bytes:
f7 30 30 09 03 00"). I think this is unrelated.
* There's an Intel USB-LJCA bridge (8086:0b63) at HS08 / INTC1098 that brings
up spi1 via spi_ljca. spi1 has no children (waiting_for_supplier=0). I'm not
sure if the VSC is supposed to live here on this platform.
I don't know what changed between the kernel I originally installed with
and 7.0.0-14. apt history puts the HWE hop to 7.0.0-14.14 on 2026-04-23
and nothing else camera-related changed in that transaction.
Happy to do whatever is helpful.
Attached `diagnostics.txt` has DMI, package versions, lsmod, lspci/lsusb, the
spi_master tree, the relevant ACPI nodes, and the IPU6/MEI/VSC/OV2740/LJCA
kernel and libcamera/pipewire log lines.
---
ProblemType: Bug
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: atb 3887 F.... pipewire
atb 3902 F.... wireplumber
/dev/snd/seq: atb 3887 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 26.04
InstallationDate: Installed on 2026-05-17 (2 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 21E8002YSG
Package: linux (not installed)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-15-generic
root=UUID=61e8b5c4-2752-445a-93d2-a68c8bb7dd3c ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
RebootRequiredPkgs: Error: path contained symlinks.
Tags: resolute wayland-session
Uname: Linux 7.0.0-15-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sudo users
_MarkForUpload: True
dmi.bios.date: 12/03/2025
dmi.bios.release: 1.33
dmi.bios.vendor: LENOVO
dmi.bios.version: N3IET53W (1.33 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21E8002YSG
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76530 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.21
dmi.modalias:
dmi:bvnLENOVO:bvrN3IET53W(1.33):bd12/03/2025:br1.33:efr1.21:svnLENOVO:pn21E8002YSG:pvrThinkPadX1NanoGen2:rvnLENOVO:rn21E8002YSG:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21E8_BU_Think_FM_ThinkPadX1NanoGen2:pfaThinkPadX1NanoGen2:
dmi.product.family: ThinkPad X1 Nano Gen 2
dmi.product.name: 21E8002YSG
dmi.product.sku: LENOVO_MT_21E8_BU_Think_FM_ThinkPad X1 Nano Gen 2
dmi.product.version: ThinkPad X1 Nano Gen 2
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: acpi apport-collected camera hwe-26.04 ipu6 mei-vsc ov2740
regression-update resolute thinkpad wayland-session webcam x1-nano
** Attachment added: "Diagnostics: DMI, packages, lsmod, lspci/lsusb, SPI tree,
ACPI VSC nodes, kernel + libcamera/pipewire logs"
https://bugs.launchpad.net/bugs/2153096/+attachment/5971382/+files/diagnostics.txt
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https://bugs.launchpad.net/bugs/2153096
Title:
IPU6 webcam (OV2740) stopped working after HWE upgrade to 7.0.0-15 on
X1 Nano
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