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[Erich Eickmeyer  <1969827@xxxxxxxxxxxxxxxxxx>]

** Tags removed: verification-needed verification-needed-jammy
** Tags added: verification-done verification-done-jammy

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https://bugs.launchpad.net/bugs/1969827

Title:
  Studio Controls doesn't actually switch to FFADO

Status in studio-controls package in Ubuntu:
  Fix Committed
Status in studio-controls source package in Jammy:
  Fix Committed

Bug description:
  [Impact]

   * Users of Studio Controls, specifically Ubuntu Studio users using
  Firewire audio interfaces, are running into issues where using Studio
  Controls to switch to the FFADO driver as provided by libffado (as
  opposed to the ALSA firewire driver) are unable to do so.

   * The dropdown menu in Studio Controls that switches between the two
  is supposed to add a blacklist item into /etc/modprobe.d to blacklist
  the ALSA Firewire driver, which is in direct conflict with the FFADO
  driver required by some Firewire audio interfaces and must be
  blacklisted. Currently, this dropdown menu has no effect.

   * The uploaded package fixes this by refactoring the copying
  mechanism. This has already been fixed in a future release of Studio
  Controls.

  [Test Plan]

   * Launch Studio Controls

   * In the System Tweaks tab, switch "FireWire Module select (reboot to
  switch):) menu to "Use FFADO FireWire Modules"

   * Reboot

   * Login, launch Studio Controls

   * Notice FireWire Module Select is back on ALSA.

   * 'ls /etc/modprobe.d/' will not show 'blacklist-studio.conf'

   * Expected behavior: FireWire Module select should be on FFADO and
  'blacklist-studio.conf' should exist in '/etc/modprobe.d/'

  [Where problems could occur]

   * Although great care has been taken to avoid this, the 'blacklist-studio.conf' file could get stuck and remain blacklisting ALSA firewire modules. If this does cause such a regression, a further upload will fix this. However, this is unlikely as it merely invokes code that was not being invoked before that already existed as this is merely correcting a regression.
     
  [Other Info]
   
   * Original Description:

  Choosing the drop-down to switch the FireWire module from ALSA to
  FFADO doesn't appear to actually do anything.

  No blacklist-studio.conf file ever gets created in /etc/modprobe.d.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: studio-controls 2.3.1-0ubuntu1
  ProcVersionSignature: Ubuntu 5.15.0-24.24-lowlatency 5.15.30
  Uname: Linux 5.15.0-24-lowlatency x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Thu Apr 21 20:07:06 2022
  InstallationDate: Installed on 2022-04-20 (1 days ago)
  InstallationMedia: Ubuntu-Studio 22.04 LTS "Jammy Jellyfish" - Beta amd64 (20220329.1)
  PackageArchitecture: all
  SourcePackage: studio-controls
  UpgradeStatus: No upgrade log present (probably fresh install)

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