[Bug 2057822] Re: Removing irqbalance disables power button on Raspberry Pi 5

[Erich Eickmeyer]

Using Edubuntu Noble Numbat daily build 20240311

Kernel: 6.8.0-1001-raspi

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2024-03-13T14:07:03.202417-07:00 erich-edubuntu-rpi5 kernel: input:
pwr_button as /devices/platform/pwr_button/input/input1

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Verified `irqbalance` is not installed.

This is using the exact same kernel setup and package as Ubuntu Desktop
RaspberryPi with just some additional packages, otherwise no difference.

Therefore, unable to reproduce.

** Changed in: ubuntu-raspi-settings (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2057822

Title:
  Removing irqbalance disables power button on Raspberry Pi 5

Status in ubuntu-raspi-settings package in Ubuntu:
  Incomplete

Bug description:
  As discussed in Bug #1833322: "Please consider no more having
  irqbalance enabled by default (per image/use-case/TBD)"
  (https://bugs.launchpad.net/ubuntu/+source/ubuntu-meta/+bug/1833322)
  the irqbalance package will no longer be installed by default in
  Noble. So as a test I removed the package from my Raspberry Pi 5
  running Mantic Server, after which the Pi 5's power button no longer
  worked to poweroff the system. Re-installing irqbalance caused the
  button to work again.

  With irqbalance installed I see these messages at boot time:

  kernel: input: pwr_button as /devices/platform/pwr_button/input/input1
  systemd-logind[694]: Watching system buttons on /dev/input/event0 (pwr_button)

  Without irqbalance I see this:

  kernel: gpio-keys pwr_button: Unable to get irq number for GPIO 0,
  error -6

  So the Raspberry Pi 5 might still need irqbalance installed, or
  perhaps there's a better solution for enabling the button.

  I have the following appended to the Mantic default
  /boot/firmware/config.txt:

  # Trickle charge the RTC battery (default: don't charge)
  dtparam=rtc_bbat_vchg=3000000
  # Enable the PCIe external connector
  dtparam=nvme
  # Force PCIe Gen 3.0 (default: Gen 2.0; not certified for Gen 3.0)
  # dtparam=pciex1_gen=3
  # Enable second serial port on GPIO 14 & 15 (default: disabled)
  dtparam=uart0
  # Change activity LED behavior (default: blink for MMC access)
  dtparam=act_led_trigger=heartbeat
  # Disable Bluetooth (not wanted on a server)
  dtoverlay=disable-bt-pi5
  # Enable PPS on GPIO 18 for MAX-M8Q GNSS HAT
  dtoverlay=pps-gpio,gpiopin=18,capture_clear

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