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)
Status:	CLOSED CODE_FIX
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?

Thanks
Andrew