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apport-collect 1949276

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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: hirsute

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https://bugs.launchpad.net/bugs/1949276

Title:
  linux-image-raspi PWM not available

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello,

  I'm using Raspberry Pi 4b with Ubuntu 21.10.
  Seems like all 5.13 kernels don't have PWM support.

  Replication steps:
  - Enable pwm in config.txt:
  `dtoverlay=pwm-2chan,pin=12,func=4,pin2=13,func2=4`

  - Check /sys/class/pwm

  Expected result:
  PWM exists

  - What I get:
  ```
  root@raspberrypi:~# ls -l /sys/class/pwm/
  total 0
  root@raspberrypi:~#
  ```
  ---
  Same output using 5.11.0-1021-raspi kernel:
  ```
  root@raspberrypi:~# uname -a 
  Linux raspberrypi 5.11.0-1021-raspi #22-Ubuntu SMP PREEMPT Wed Oct 6 17:30:38 
UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
  root@raspberrypi:~# ls -l /sys/class/pwm/
  total 0
  lrwxrwxrwx 1 root root 0 окт 31 00:49 pwmchip0 -> 
../../devices/platform/soc/fe20c000.pwm/pwm/pwmchip0
  ```

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