[Bug 2076402] Re: Fix alsa scarlett2 driver in 6.8

This bug is awaiting verification that the linux-xilinx/6.8.0-1009.10
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-noble-linux-xilinx' to 'verification-done-
noble-linux-xilinx'. If the problem still exists, change the tag
'verification-needed-noble-linux-xilinx' to 'verification-failed-noble-
linux-xilinx'.


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!


** Tags added: kernel-spammed-noble-linux-xilinx-v2 verification-needed-noble-linux-xilinx

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https://bugs.launchpad.net/bugs/2076402

Title:
Fix alsa scarlett2 driver in 6.8

Status in linux package in Ubuntu:
Invalid
Status in linux source package in Noble:
Fix Committed

Bug description:
SRU Justification:

[Impact]
Coming from the author of the ALSA scarlett2 driver.
Users have been reporting issues where the driver sometimes fails to initialize or fails later when being used.
https://github.com/geoffreybennett/scarlett-gen2/issues/15
https://github.com/geoffreybennett/scarlett-gen2/issues/19

[Fix]
Cherry pick these commits:
- 4074f8d23278 ALSA: scarlett2: Move initialisation code lower in the
  source
- 1b65088958ca ALSA: scarlett2: Implement handling of the ACK
  notification
They are clean cherry-picks.

[Test plan]
Not much done here apart from a build test.

[Where problems could occur]
It's been in 6.10 for a while and no problem has been reported.

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