i2c devices missing in lunar

[Dave Jones]

[Impact]

In the lunar release of linux-raspi, despite the boot configuration enabling the i2c_arm parameter of the base overlay, the usual /dev/i2c-0 and /dev/i2c-1 devices are missing (they are present in jammy and kinetic). These are the I2C interfaces present on the GPIO header (and thus rather important on the raspi as without these interfaces being present, I2C devices connected to the header cannot be used).

I'm guessing this is a kernel change, but it *might* be something in the udev configuration; I haven't dug that far yet.

[Test Case]

Boot raspi and check presence of /dev/i2c-* device entries.

[Where Problems Could Occur]

Previous release had the i2c-dev driver compiled into the kernel. With lunar we turned it into a module which turns out to be not great. So change it back and restore the old behavior.

[Juerg Haefliger (juergh)]

With Lunar the i2c_dev module is a stand-alone module and not statically built into the kernel anymore.

$ modprobe i2c_dev
$ ls /dev/ic2*
/dev/i2c-1 /dev/i2c-20 /dev/i2c-21

[Juerg Haefliger (juergh)]

This is in alignment with the Pi Foundation's kernel and helps to reduce kernel memory consumption. Is this causing issues?

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-raspi/6.2.0-1008.10 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-lunar' to 'verification-done-lunar'. If the problem still exists, change the tag 'verification-needed-lunar' to 'verification-failed-lunar'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Dave Jones (waveform)]

Verified on a fresh lunar desktop install with the kernel currently in -proposed (6.2.0-1008.10). Both /dev/i2c-0 and /dev/i2c-1 are now present.

[Manuel Diewald (diewald)]

I can verify that /dev/i2c-1 is present after installing linux-raspi/6.2.0-1008.10.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-raspi - 6.2.0-1008.10

---------------
linux-raspi (6.2.0-1008.10) lunar; urgency=medium

  * lunar/linux-raspi: 6.2.0-1008.10 -proposed tracker (LP: #2025455)

  * Packaging resync (LP: #1786013)
    - [Packaging] update Ubuntu.md
    - [Packaging] update annotations scripts

  * raspi-nolpae flavor is pointless nowadays (LP: #2023359)
    - [Packaging] raspi: Remove raspi-nolpae armhf flavor

  * Pi Camera 3 not working with Lunar (LP: #2024434)
    - [Config] raspi: Set VIDEO_DW9807_VCM=m

  * i2c devices missing in lunar (LP: #2019320)
    - [Config] raspi: Set I2C_CHARDEV=y

  [ Ubuntu: 6.2.0-25.25 ]

  * lunar/linux: 6.2.0-25.25 -proposed tracker (LP: #2024167)
  * ftrace in ubuntu_kernel_selftests failed with "check if duplicate events are
    caught" on J-5.15 P9 / J-kvm / L-kvm (LP: #1977827)
    - SAUCE: selftests/ftrace: Add test dependency
  * Add microphone support of the front headphone port on P3 Tower
    (LP: #2023650)
    - ALSA: hda/realtek: Add Lenovo P3 Tower platform
  * Add audio support for ThinkPad P1 Gen 6 and Z16 Gen 2 (LP: #2023539)
    - ALSA: hda/realtek: Add quirk for ThinkPad P1 Gen 6
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    touchpad (LP: #2023004)
    - drm/i915: Use 18 fast wake AUX sync len
  * Fix Monitor lost after replug WD19TBS to SUT port with VGA/DVI to type-C
    dongle (LP: #2021949)
    - thunderbolt: Increase timeout of DP OUT adapter handshake
    - thunderbolt: Do not touch CL state configuration during discovery
    - thunderbolt: Increase DisplayPort Connection Manager handshake timeout
  * Enable Tracing Configs for OSNOISE and TIMERLAT (LP: #2018591)
    - [Config] Enable OSNOISE_TRACER and TIMERLAT_TRACER configs
  * Fix only reach PC3 when ethernet is plugged r8169 (LP: #1946433)
    - r8169: use spinlock to protect mac ocp register access
    - r8169: use spinlock to protect access to registers Config2 and Config5
    - r8169: enable cfg9346 config register access in atomic context
    - r8169: prepare rtl_hw_aspm_clkreq_enable for usage in atomic context
    - r8169: disable ASPM during NAPI poll
    - r8169: remove ASPM restrictions now that ASPM is disabled during NAPI poll
  * introduce do_lib_rust=true|false to enable/disable linux-lib-rust package
    (LP: #2021605)
    - [Packaging] introduce do_lib_rust and enable it only on generic amd64
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    Ryzen 9 PRO 7940HS w/ Radeon 780M Graphics (LP: #2020685)
    - drm/amdgpu: refine get gpu clock counter method
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  * generate linux-lib-rust only on amd64 (LP: #2020356)
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    - ALSA: hda: Add NVIDIA codec IDs a3 through a7 to patch table
  * Add support for mdev_set_iommu_device() kABI in Ubuntu 22.10 kernel
    (LP: #1988806)
    - SAUCE: Add mdev_set_iommu_device() kABI.
  * Enable audio LEDs on HP laptops (LP: #2019915)
    - ALSA: hda/realtek: Fix mute and micmute LEDs for an HP laptop
    - ALSA: hda/realtek: Fix m...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-raspi - 6.5.0-1002.2

---------------
linux-raspi (6.5.0-1002.2) mantic; urgency=medium

  * mantic/linux-raspi: 6.5.0-1002.2 -proposed tracker (LP: #2033637)

  * Packaging resync (LP: #1786013)
    - [Packaging] update update.conf

  * Miscellaneous Ubuntu changes
    - [Config] raspi: Add notes to configs that differ from master
    - [Config] raspi: Set CONFIG_ARM_ERRATA_<foo>=n
    - [Config] raspi: Set PREEMPT_DYNAMIC=y
    - [Config] raspi: Set STAGING_MEDIA_DEPRECATED=n
    - [Config] raspi: Set EFI=n
    - [Config] raspi: Set POWER_RESET_GPIO_RESTART=n
    - [Config] raspi: Set HID_BPF=n
    - [Config] raspi: Set COMMON_CLK_FIXED_MMIO=n
    - [Config] raspi: Set PWM_STMPE=n
    - [Config] raspi: Set LEDS_SYSCON=n
    - [Packaging] raspi: Include bcm2835_smi module in linux-modules
    - SAUCE: (no-up) Disable FIQ split-transaction FSM in dwc_otg

  * Miscellaneous upstream changes
    - drivers: media: imx296: Updated imx296 driver for external trigger
    - char: broadcom: vc_mem: Fix preprocessor conditional
    - drivers: dwc_otg: Fix fallthrough warnings
    - vc04_services/vc-sm-cma: Switch one-bit bitfields to bool
    - media: i2c: ov2311: Fix uninitialized variable usage
    - drm/panel: Fix default values for Waveshare 7.9 inch DSI touchscreen (#5565)
    - dtoverlays: Add i2c bus overrides to edt-ft5406 overlay
    - dtoverlays: Fix README text for i2c-fan
    - drivers: irqchip: irq-bcm2835: Concurrency fix
    - defconfigs: Add TINYDRM_ILI9486 to defconfigs
    - dtoverlays: Add drm option to piscreen overlay
    - drm/ili9486: Resolve clash in spi_device_id names
    - input: ads7846: Add missing spi_device_id strings
    - staging: bcm2835-codec: Downgrade the level for a debug message
    - configs: Raise 8250 UART limit to 5 on BCM2711

  [ Ubuntu: 6.5.0-5.5 ]

  * mantic/linux: 6.5.0-5.5 -proposed tracker (LP: #2034546)
  * Packaging resync (LP: #1786013)
    - [Packaging] update helper scripts
    - debian/dkms-versions -- update from kernel-versions (main/d2023.08.23)

  [ Ubuntu: 6.5.0-4.4 ]

  * mantic/linux: 6.5.0-4.4 -proposed tracker (LP: #2034042)
  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/d2023.08.23)

  [ Ubuntu: 6.5.0-3.3 ]

  * mantic/linux: 6.5.0-3.3 -proposed tracker (LP: #2033904)
  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/d2023.08.23)
  * [23.10] Please test secure-boot and lockdown on the early 6.5 kernel (s390x)
    (LP: #2026833)
    - [Packaging] re-enable signing for s390x
  * Miscellaneous upstream changes
    - module/decompress: use vmalloc() for zstd decompression workspace

  [ Ubuntu: 6.5.0-2.2 ]

  * mantic/linux: 6.5.0-2.2 -proposed tracker (LP: #2033240)
  * Soundwire support for Dell SKU0C87 devices (LP: #2029281)
    - SAUCE: ASoC: Intel: soc-acpi: add support for Dell SKU0C87 devices
  * Fix numerous AER related issues (LP: #2033025)
    - SAUCE: PCI/AER: Disable AER service during suspend, again
    - SAUCE: PCI/DPC: Disable DPC service during suspend, again
  * Support Realtek RTL8852CE WiFi 6E/BT Combo (LP: #2025672)
    - wifi: r...