[Bug 2163610] [NEW] OVTI08F4 camera fails to probe on HP Spectre x360 14-eu0xxx (error -121)

Public bug reported: I am reporting a built-in camera failure on an HP Spectre x360 2-in-1 Laptop 14-eu0xxx. System - Ubuntu 26.04 LTS - linux-image-7.0.0-29-generic, package version 7.0.0-29.29 - Camera sensor: OVTI08F4 / OmniVision ov08x40 - Intel IPU6 camera stack Expected result The ov08x40 sensor should probe and the built-in camera should be available to libcamera and desktop camera applications. Actual result The sensor fails to read its chip ID and the camera is unavailable: ov08x40: error reading chip-id register: -121 What I found The existing 45 ms INT3472 handshake delay is not long enough on this laptop. A 150 ms delay allows the sensor to probe. I prepared a DMI-scoped quirk so the longer delay is used only for the matching HP Spectre x360 14-eu0xxx family. After the sensor probes, libcamera also needs the ov08x40 driver to report the native size, crop bounds, and active crop through get_selection(). Without that, camera setup fails with rectangle ioctl errors. Testing I applied both kernel patches to the Ubuntu 7.0.12 source from linux-source-7.0.0 package version 7.0.0-29.29 and built the three affected modules for 7.0.0-29-generic. The patches passed scripts/checkpatch.pl --strict. The rebuilt modules were signed for Secure Boot, installed, and loaded after reboot. With the patches applied: - the sensor was detected and the -121 probe error did not return; - libcamera detected one camera and captured 60 consecutive 3848x2416 frames at 30 fps; - PipeWire exposed the built-in front camera; and - GNOME Snapshot showed a stable live preview. Patches and full validation notes https://github.com/liondragon/hp-spectre-ov08x40-camera Kernel patches https://github.com/liondragon/hp-spectre-ov08x40-camera/tree/main/patches/linux Validation record https://github.com/liondragon/hp-spectre-ov08x40-camera/blob/main/docs/validation.md ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2163610 Title: OVTI08F4 camera fails to probe on HP Spectre x360 14-eu0xxx (error -121) Status in linux package in Ubuntu: New Bug description: I am reporting a built-in camera failure on an HP Spectre x360 2-in-1 Laptop 14-eu0xxx. System - Ubuntu 26.04 LTS - linux-image-7.0.0-29-generic, package version 7.0.0-29.29 - Camera sensor: OVTI08F4 / OmniVision ov08x40 - Intel IPU6 camera stack Expected result The ov08x40 sensor should probe and the built-in camera should be available to libcamera and desktop camera applications. Actual result The sensor fails to read its chip ID and the camera is unavailable: ov08x40: error reading chip-id register: -121 What I found The existing 45 ms INT3472 handshake delay is not long enough on this laptop. A 150 ms delay allows the sensor to probe. I prepared a DMI-scoped quirk so the longer delay is used only for the matching HP Spectre x360 14-eu0xxx family. After the sensor probes, libcamera also needs the ov08x40 driver to report the native size, crop bounds, and active crop through get_selection(). Without that, camera setup fails with rectangle ioctl errors. Testing I applied both kernel patches to the Ubuntu 7.0.12 source from linux-source-7.0.0 package version 7.0.0-29.29 and built the three affected modules for 7.0.0-29-generic. The patches passed scripts/checkpatch.pl --strict. The rebuilt modules were signed for Secure Boot, installed, and loaded after reboot. With the patches applied: - the sensor was detected and the -121 probe error did not return; - libcamera detected one camera and captured 60 consecutive 3848x2416 frames at 30 fps; - PipeWire exposed the built-in front camera; and - GNOME Snapshot showed a stable live preview. Patches and full validation notes https://github.com/liondragon/hp-spectre-ov08x40-camera Kernel patches https://github.com/liondragon/hp-spectre-ov08x40-camera/tree/main/patches/linux Validation record https://github.com/liondragon/hp-spectre-ov08x40-camera/blob/main/docs/validation.md To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2163610/+subscriptions