Bug 28592

Summary: Multichannels LPCM through HDMI audio does not work anymore on NVidia cards
Product: Drivers Reporter: dura (dura)
Component: Sound(ALSA)Assignee: Jaroslav Kysela (perex)
Severity: normal CC: florian, maciej.rutecki, mtbdrew, rjw, tiwai
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.37 Subsystem:
Regression: Yes Bisected commit-id:
Bug Depends on:    
Bug Blocks: 21782    
Attachments: Fix patch

Description dura 2011-02-08 13:39:04 UTC
I've got a GT240 NVidia card and PCM HDMI audio is limited to two channels with kernel 2.6.37. Other NVidia cards are probably affected as well.
Reverting http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=53d7d69d8ffdfa60c5b66cc2e9ee0774aaaef5c0 make things going back to normal.
Comment 1 Takashi Iwai 2011-02-08 16:30:25 UTC
Fixed in sound git tree.  The patch is attached below.
Comment 2 Takashi Iwai 2011-02-08 16:30:57 UTC
Created attachment 46852 [details]
Fix patch
Comment 3 Rafael J. Wysocki 2011-02-08 19:53:26 UTC
Handled-By : Takashi Iwai <tiwai@suse.de>
Patch : https://bugzilla.kernel.org/attachment.cgi?id=46852
Comment 4 Florian Mickler 2011-02-20 00:16:43 UTC
merged for .38-rc5:
commit 11839aed21881d7edd65dd79f22a8eb18426f672
Author: Takashi Iwai <tiwai@suse.de>
Date:   Tue Feb 8 17:25:49 2011 +0100

    ALSA: hda - Fix missing CA initialization for HDMI/DP
Comment 5 Andrew 2014-02-13 19:47:02 UTC
Any chance this issue was re-introduced? I'm running Ubuntu 13.10 and after latest updates I no longer get 5.1 sound only 2 channel. I've swapped hardware to confirm it is not the card. Changed drivers etc nothing seems to work.

How do go about confirm if this is the same issue or a new bug?