[Bug 2106220] [NEW] Pi camera module requires user access to /dev/dma_heap/linux, cma

[Dave Jones]

Public bug reported:

The libcamera stack on the Raspberry Pi requires that the user have
read/write access to /dev/dma_heap/linux,cma to allocate streaming
buffers. After discussion with the kernel team there shouldn't be any
issue with granting this access via the udev uaccess mechanism.

** Affects: ubuntu-raspi-settings (Ubuntu)
     Importance: Critical
     Assignee: Dave Jones (waveform)
         Status: Confirmed

** Changed in: ubuntu-raspi-settings (Ubuntu)
     Assignee: (unassigned) => Dave Jones (waveform)

** Changed in: ubuntu-raspi-settings (Ubuntu)
    Milestone: None => ubuntu-25.04

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

** Changed in: ubuntu-raspi-settings (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-raspi-settings (Ubuntu)
   Importance: High => Critical

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https://bugs.launchpad.net/bugs/2106220

Title:
  Pi camera module requires user access to /dev/dma_heap/linux,cma

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

Bug description:
  The libcamera stack on the Raspberry Pi requires that the user have
  read/write access to /dev/dma_heap/linux,cma to allocate streaming
  buffers. After discussion with the kernel team there shouldn't be any
  issue with granting this access via the udev uaccess mechanism.

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