Dell Pro 14 Premium PA14250 (Lunar Lake, Core Ultra 7 266V) - Camera status on Ubuntu 24.04

Hardware: Dell Pro 14 Premium PA14250
CPU: Intel Core Ultra 7 266V (Lunar Lake)
GPU: Intel Arc 140V (Xe2)
Camera: OV08F40 (8MP, OVTI08F4) via Intel IPU7
OS: Ubuntu 24.04 LTS
Kernel tested: 6.11.0-1016-oem, 6.17.0-1017-oem

=== WHAT WORKS ===
- Camera works at 1280x720 30fps in:
  Firefox, Chrome, Zoom, Teams, mpv
  via v4l2loopback (/dev/video0) fed by v4l2-relayd/icamerasrc

=== WHAT DOES NOT WORK ===
- GNOME Snapshot (crashes - GStreamer GL bug on Intel Arc/Wayland)
- Cheese (crashes - same reason)
- libcamera apps (IPU7 pipeline not yet in mainline libcamera)

=== ROOT CAUSES IDENTIFIED ===

1. INT3472 GPIO type 0x12 (handshake):
   Was missing in older OEM kernels, causing:
   "int3472-discrete INT3472:00: GPIO type 0x12 unknown"
   FIXED in linux-oem-6.17 since version 6.17.0-1006.6 (LP: #2128792)

2. INTC10B5 GPIO controller:
   Already handled correctly by LJCA driver (gpio-usbio/usb-ljca).
   No fix needed - confirmed by Intel kernel maintainer Andy Shevchenko.

3. IPU7 driver in staging:
   Intel IPU7 driver entered drivers/staging/media in kernel 6.17.
   libcamera does not yet have an IPU7 pipeline.
   This is why GNOME Snapshot and Cheese don't work.

4. Dell BIOS _CID issue:
   BIOS does not set _CID properly for INTC10B5.
   Reported to Intel maintainer Andy Shevchenko who confirmed it.
   Related kernel patch thread:
   https://lore.kernel.org/platform-driver-x86/20260404190236.5218-1-<To protect you, your private information was removed from public view. All private data was saved to your private Case. DELL-Admin>

=== KERNEL PATCHES SUBMITTED ===
Two patches submitted to platform-driver-x86@vger.kernel.org on 2026-04-05:
- [PATCH 1/2] pinctrl: intel: platform: Add INTC10B5 ACPI ID for Lunar Lake
  (dropped per Andy - LJCA handles this correctly)
- [PATCH 2/2] platform/x86: int3472: Handle GPIO types 0x02 and 0x12
  (INT3472_GPIO_TYPE_HANDSHAKE already in mainline - backport requested)

=== BUGS FILED ===
- Ubuntu Launchpad #2131016: https://bugs.launchpad.net/bugs/2131016
- Ubuntu Launchpad #2128792: https://bugs.launchpad.net/bugs/2128792
- Intel ipu7-drivers #26: https://github.com/intel/ipu7-drivers/issues/26

=== RELATED DELL KB ===
Dell KB 000444502 - Camera not functioning in Ubuntu 24.04 after kernel update:
https://www.dell.com/support/kbdoc/000444502

=== EXPECTED FULL FIX ===
Ubuntu 26.04 LTS (April 2026) - ships with:
- kernel 6.20/7.0 with IPU7 driver promoted from staging
- libcamera with IPU7 pipeline support
- GStreamer fixes for Intel Arc/Wayland

=== WORKAROUND FOR NOW ===
On kernel 6.17.0-1017-oem, camera works via:
sudo apt install linux-modules-ipu7-oem-24.04d \
    gstreamer1.0-icamera libcamhal-ipu7x v4l2-relayd
Then reboot. Camera works in Firefox, Chrome, Zoom.