** Description changed:
+ SRU Justification:
+
+ [ Impact ]
+
+ On Ubuntu 26.04 systems using affected generic and OEM kernels, the
+ built-in MIPI camera (Sony IMX471, ACPI SONY471A) is detected, but
+ Intel IPU7 initialization fails.
+
+ The IPU bridge attempts to register the "SONY471A-0" software node
+ twice. The second registration fails with -EEXIST, causing IPU bridge
+ initialization and the intel-ipu7 probe to fail:
+
+ intel-ipu7 0000:00:05.0: Found supported sensor SONY471A:00
+ sysfs: cannot create duplicate filename '/kernel/software_nodes/SONY471A-0'
+ kobject_add_internal failed for SONY471A-0 with -EEXIST
+ intel-ipu7 0000:00:05.0: error -EEXIST: IPU bridge init failed
+ intel-ipu7 0000:00:05.0: probe with driver intel-ipu7 failed with error -17
+
+ [ Fix ]
+
+ Upstream commit 84c56e1cb378f ("media: ipu-bridge: Add IMX471 to
+ the list of supported sensors") already provides the SONY471A
+ configuration.
+
+ Ubuntu SAUCE commit 2a49c9a148e53 ("UBUNTU: SAUCE: media:
+ ipu-bridge: Support imx471 sensor") was later applied on top of a
+ tree already containing that upstream support, resulting in two
+ identical SONY471A entries.
+
+ Remove the redundant Ubuntu-added entry while retaining the
+ upstream sensor configuration.
+
+ [ Test Plan ]
+
+ Boot a patched kernel on a Lenovo ThinkPad X9-15 Gen 1 equipped
+ with Intel IPU7 and a Sony IMX471 sensor.
+
+ Verify that the IPU bridge detects SONY471A, connects one camera,
+ and that the IMX471 and IPU7 probes complete successfully.
+
+ Confirm that there is no duplicate SONY471A-0 software-node
+ registration, no -EEXIST / error -17 from intel-ipu7, and no
+ associated refcount warnings or kernel Oopses.
+
+ [ Where problems could occur ]
+
+ The change affects the IPU supported-sensor table used during
+ camera bridge initialization.
+
+ A regression could affect IMX471 sensor detection or registration.
+ The risk is low because the removed SONY471A entry is identical to
+ the remaining upstream entry, so one valid configuration is
+ preserved.
+
+
On Kubuntu 26.04 (kernel 7.0.0-27-generic, GENERIC not OEM), the built-in
MIPI camera (Sony IMX471, ACPI SONY471A) is detected but intel-ipu7 fails
to probe. The IPU bridge tries to register software node "SONY471A-0",
which already exists, so registration aborts:
- intel-ipu7 0000:00:05.0: Found supported sensor SONY471A:00
- sysfs: cannot create duplicate filename '/kernel/software_nodes/SONY471A-0'
- kobject_add_internal failed for SONY471A-0 with -EEXIST
- intel-ipu7 0000:00:05.0: error -EEXIST: IPU bridge init failed
- intel-ipu7 0000:00:05.0: probe with driver intel-ipu7 failed with error -17
+ intel-ipu7 0000:00:05.0: Found supported sensor SONY471A:00
+ sysfs: cannot create duplicate filename '/kernel/software_nodes/SONY471A-0'
+ kobject_add_internal failed for SONY471A-0 with -EEXIST
+ intel-ipu7 0000:00:05.0: error -EEXIST: IPU bridge init failed
+ intel-ipu7 0000:00:05.0: probe with driver intel-ipu7 failed with error -17
Call trace: ipu_bridge_connect_sensor -> software_node_register_node_group
-> swnode_register -> kobject_init_and_add (EEXIST).
No third-party / DKMS / OEM camera stack is installed. Only the in-tree
intel_ipu7 and ipu_bridge modules are loaded. dkms is not installed.
Hardware: LENOVO ThinkPad X9-15 Gen 1, model 21Q6004KCL.
No /dev/video* or working camera device is created as a result.
Expected: IPU7 bridge initializes and the IMX471 camera becomes available.
Actual: bridge init aborts on duplicate SONY471A-0 software node, probe
fails with -17.
This appears related to but distinct from bug 2107320 (IMX471 enablement,
Fix Released) and bug 2121948 (IMX471 suspend/resume, "-5 failed to find
sensor"). Those concern getting the sensor recognized; here the sensor IS
recognized and the bridge then fails on a duplicate software-node
registration (-EEXIST / -17).
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
- USER PID ACCESS COMMAND
- /dev/snd/controlC0: ianri 1959 F.... pipewire
- ianri 1965 F.... wireplumber
- /dev/snd/pcmC0D0p: ianri 1959 F...m pipewire
- /dev/snd/seq: ianri 1959 F.... pipewire
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC0: ianri 1959 F.... pipewire
+ ianri 1965 F.... wireplumber
+ /dev/snd/pcmC0D0p: ianri 1959 F...m pipewire
+ /dev/snd/seq: ianri 1959 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sat Jun 27 18:19:05 2026
InstallationDate: Installed on 2026-06-20 (8 days ago)
InstallationMedia: Kubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423)
MachineType: LENOVO 21Q6004KCL
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
root=UUID=3a2c49f3-e5b0-4d8a-ab8a-d8855ef7fe7e ro quiet splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
StagingDrivers: intel_ipu7
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/06/2025
dmi.bios.release: 1.12
dmi.bios.vendor: LENOVO
dmi.bios.version: N4CET36W (1.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21Q6004KCL
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76576 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.8
dmi.modalias:
dmi:bvnLENOVO:bvrN4CET36W(1.12):bd03/06/2025:br1.12:efr1.8:svnLENOVO:pn21Q6004KCL:pvrThinkPadX9-15Gen1:rvnLENOVO:rn21Q6004KCL:rvrSDK0T76576WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21Q6_BU_Think_FM_ThinkPadX9-15Gen1:pfaThinkPadX9-15Gen1:
dmi.product.family: ThinkPad X9-15 Gen 1
dmi.product.name: 21Q6004KCL
dmi.product.sku: LENOVO_MT_21Q6_BU_Think_FM_ThinkPad X9-15 Gen 1
dmi.product.version: ThinkPad X9-15 Gen 1
dmi.sys.vendor: LENOVO
** Description changed:
SRU Justification:
[ Impact ]
On Ubuntu 26.04 systems using affected generic and OEM kernels, the
built-in MIPI camera (Sony IMX471, ACPI SONY471A) is detected, but
Intel IPU7 initialization fails.
The IPU bridge attempts to register the "SONY471A-0" software node
twice. The second registration fails with -EEXIST, causing IPU bridge
initialization and the intel-ipu7 probe to fail:
intel-ipu7 0000:00:05.0: Found supported sensor SONY471A:00
sysfs: cannot create duplicate filename '/kernel/software_nodes/SONY471A-0'
kobject_add_internal failed for SONY471A-0 with -EEXIST
intel-ipu7 0000:00:05.0: error -EEXIST: IPU bridge init failed
intel-ipu7 0000:00:05.0: probe with driver intel-ipu7 failed with error -17
[ Fix ]
Upstream commit 84c56e1cb378f ("media: ipu-bridge: Add IMX471 to
the list of supported sensors") already provides the SONY471A
configuration.
Ubuntu SAUCE commit 2a49c9a148e53 ("UBUNTU: SAUCE: media:
ipu-bridge: Support imx471 sensor") was later applied on top of a
tree already containing that upstream support, resulting in two
identical SONY471A entries.
Remove the redundant Ubuntu-added entry while retaining the
upstream sensor configuration.
[ Test Plan ]
Boot a patched kernel on a Lenovo ThinkPad X9-15 Gen 1 equipped
with Intel IPU7 and a Sony IMX471 sensor.
Verify that the IPU bridge detects SONY471A, connects one camera,
and that the IMX471 and IPU7 probes complete successfully.
Confirm that there is no duplicate SONY471A-0 software-node
registration, no -EEXIST / error -17 from intel-ipu7, and no
associated refcount warnings or kernel Oopses.
[ Where problems could occur ]
The change affects the IPU supported-sensor table used during
camera bridge initialization.
A regression could affect IMX471 sensor detection or registration.
The risk is low because the removed SONY471A entry is identical to
the remaining upstream entry, so one valid configuration is
preserved.
-
-
+ ------------------------------------------------------------------------------
On Kubuntu 26.04 (kernel 7.0.0-27-generic, GENERIC not OEM), the built-in
MIPI camera (Sony IMX471, ACPI SONY471A) is detected but intel-ipu7 fails
to probe. The IPU bridge tries to register software node "SONY471A-0",
which already exists, so registration aborts:
intel-ipu7 0000:00:05.0: Found supported sensor SONY471A:00
sysfs: cannot create duplicate filename '/kernel/software_nodes/SONY471A-0'
kobject_add_internal failed for SONY471A-0 with -EEXIST
intel-ipu7 0000:00:05.0: error -EEXIST: IPU bridge init failed
intel-ipu7 0000:00:05.0: probe with driver intel-ipu7 failed with error -17
Call trace: ipu_bridge_connect_sensor -> software_node_register_node_group
-> swnode_register -> kobject_init_and_add (EEXIST).
No third-party / DKMS / OEM camera stack is installed. Only the in-tree
intel_ipu7 and ipu_bridge modules are loaded. dkms is not installed.
Hardware: LENOVO ThinkPad X9-15 Gen 1, model 21Q6004KCL.
No /dev/video* or working camera device is created as a result.
Expected: IPU7 bridge initializes and the IMX471 camera becomes available.
Actual: bridge init aborts on duplicate SONY471A-0 software node, probe
fails with -17.
This appears related to but distinct from bug 2107320 (IMX471 enablement,
Fix Released) and bug 2121948 (IMX471 suspend/resume, "-5 failed to find
sensor"). Those concern getting the sensor recognized; here the sensor IS
recognized and the bridge then fails on a duplicate software-node
registration (-EEXIST / -17).
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ianri 1959 F.... pipewire
ianri 1965 F.... wireplumber
/dev/snd/pcmC0D0p: ianri 1959 F...m pipewire
/dev/snd/seq: ianri 1959 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sat Jun 27 18:19:05 2026
InstallationDate: Installed on 2026-06-20 (8 days ago)
InstallationMedia: Kubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423)
MachineType: LENOVO 21Q6004KCL
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
root=UUID=3a2c49f3-e5b0-4d8a-ab8a-d8855ef7fe7e ro quiet splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
StagingDrivers: intel_ipu7
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/06/2025
dmi.bios.release: 1.12
dmi.bios.vendor: LENOVO
dmi.bios.version: N4CET36W (1.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21Q6004KCL
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76576 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.8
dmi.modalias:
dmi:bvnLENOVO:bvrN4CET36W(1.12):bd03/06/2025:br1.12:efr1.8:svnLENOVO:pn21Q6004KCL:pvrThinkPadX9-15Gen1:rvnLENOVO:rn21Q6004KCL:rvrSDK0T76576WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21Q6_BU_Think_FM_ThinkPadX9-15Gen1:pfaThinkPadX9-15Gen1:
dmi.product.family: ThinkPad X9-15 Gen 1
dmi.product.name: 21Q6004KCL
dmi.product.sku: LENOVO_MT_21Q6_BU_Think_FM_ThinkPad X9-15 Gen 1
dmi.product.version: ThinkPad X9-15 Gen 1
dmi.sys.vendor: LENOVO
--
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https://bugs.launchpad.net/bugs/2158540
Title:
ThinkPad X9-15 Gen 1: IPU7 camera probe fails — duplicate
software_node SONY471A-0 (-EEXIST), bridge init failed
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