My iMac 24 (aluminium) no produces sound from the built in speakers.
Prior to change
cat /proc/asound/pcm
00-00: ALC883 Analog : ALC883 Analog : playback 1 : capture 1
00-01: ALC883 Digital : ALC883 Digital : playback 1 : capture 1
00-02: ALC883 Analog : ALC883 Analog : capture 1
After change
cat /proc/asound/pcm
00-02: ALC885 Analog : ALC885 Analog : capture 2
00-01: ALC885 Digital : ALC885 Digital : playback 1 : capture 1
00-00: ALC885 Analog : ALC885 Analog : playback 1 : capture 1
The solution, assuming no unforeseen consequences, is a single line
change:
case 0x106b1000: /* iMac 24 */
board_config = ALC885_IMAC24;
break;
becomes:
case 0x106b1000: /* iMac 24 */
case 0x106b3e00: /* iMac 24 Au */
board_config = ALC885_IMAC24;
break;
Someone with privileges to alter the source code will have to make the
change until I found out how to produce a patch.
Note: this change is also required for 9.04.
Only tested using a 64-bit kernel.
--
no external sound on 8.10 with hda intel
https://bugs.launchpad.net/bugs/295042
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