[Bug 1296373] Re: [PATCH] Fix sound on PowerPC

[Adam Smith]

To clarify for those joining/looking at this bug:

The attached patch mainly fixes an old problem that has been present
since at least 12.04 (modules incorrectly blacklisted).

In 12.10 there were changes to the sound modules and this broke snd-
powermac on a number of machines (the fixing recursive fault error).  I
think these users should be migrating to snd-aoa, and I did my best
guest to adjust the hw-detect patch to account for this.  I made the
assumption (because they sound alike) that the i2s-a machines were the
ones that used the deprectated i2c calls.

The advice in the FAQ describes how to remove the blacklist file, but
for those users who still have broken sound (the snd-powermac users who
should be now using snd-aoa) then they will have to patch the kernel
modules themselves.  I attached the kernel patch I used to the "fixing
recursive fault" bug, but this is device-id dependant and is not a
generic patch (i.e. you will have to make adjustments if your machine is
different to mine).

The hw-detect bug cannot be fixed for 14.04 because the isos have been
released, but the kernel bug can still be fixed.  You just need to work
out your device-id, adjust the patch, test it, submit it upstream, get
the commit reference, and then raise an ubuntu SRU with it!

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https://bugs.launchpad.net/bugs/1296373

Title:
  [PATCH] Fix sound on PowerPC

Status in “hw-detect” package in Ubuntu:
  Confirmed

Bug description:
  This patch is one of several needed to fix sound on PowerPC.  The
  wrong modules are loaded/blacklisted on many machines, causing sound
  not to work or worse the fatal "Fixing recursive fault rebooted is
  needed!" bug -
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1066435

  The attached patch incorporates the suggestions in this debian bug
  report https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650588 , and
  additionally splits off the 'i2s-a' machines which nolonger use
  snd_powermac (at least that is what I understand from this linuxppc-
  dev message -
  http://comments.gmane.org/gmane.linux.ports.ppc.embedded/51204 ).

  It would be excellent if this could make it into Trusty.  I'm going to
  submit another bug on the casper package.

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