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epsilon72
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Joined: 20 Sep 2007
Posts: 568
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 Posted: Thu Mar 08, 2012 9:17 am Post subject: Intel CougarPoint HDMI - surround sound broken [SOLVED] |
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Hello all,
I have a Lenovo x220 notebook that, since the update to 3.2.* kernels, has had broken surround sound.
This notebook uses snd_hda_codec_conexant for the laptop speakers and snd_hda_codec_hdmi for hdmi audio (which is actually a displayport, but audio works with an adapter).
Audio worked perfectly with the 3.0.* and 3.1.* kernels, but since 3.2.*, surround will not work. Stereo does work, though.
This command lets me test my speakers. With any 3.2.* kernel, everything but Left and Right do not produce any sound. If I boot into my 3.1.10-r1 kernel, surround works just fine.
| Code: | | speaker-test -D hdmi:CARD=PCH,DEV=0 -c 8 |
aplay -L output:
| Code: | null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=PCH
HDA Intel PCH, CONEXANT Analog
Default Audio Device
sysdefault:CARD=PCH
HDA Intel PCH, CONEXANT Analog
Default Audio Device
front:CARD=PCH,DEV=0
HDA Intel PCH, CONEXANT Analog
Front speakers
surround40:CARD=PCH,DEV=0
HDA Intel PCH, CONEXANT Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
HDA Intel PCH, CONEXANT Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
HDA Intel PCH, CONEXANT Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
HDA Intel PCH, CONEXANT Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
HDA Intel PCH, CONEXANT Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=PCH,DEV=0
HDA Intel PCH, HDMI 0
HDMI Audio Output
hdmi:CARD=PCH,DEV=1
HDA Intel PCH, HDMI 1
HDMI Audio Output
hdmi:CARD=PCH,DEV=2
HDA Intel PCH, HDMI 2
HDMI Audio Output |
Relevant lspci entry:
| Code: | | 00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 04) |
I thought at first that it might be related to this bug, but the bugfix patch has been applied to any kernel 3.2.6 and above, and my problem persists.
If any of you have Intel Cougar Point HDMI, please test whether or not your surround sound works with any 3.2.* kernel.
EDIT: I think it's more trouble than it is worth to try and pin down the specific change that caused this problem, especially considering the fact that the 3.3 kernel appears to handle multichannel audio just fine. Labeling this as WORKAROUND.
Last edited by epsilon72 on Wed Mar 21, 2012 2:06 am; edited 5 times in total |
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roarinelk
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Joined: 04 Mar 2004
Posts: 520
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| Posted: Thu Mar 08, 2012 9:33 am Post subject: |
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Try the latest -git kernel and if the problem persists, please report it
the ALSA developers <alsa-devel@vger.kernel.org>. |
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epsilon72
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Joined: 20 Sep 2007
Posts: 568
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| Posted: Thu Mar 08, 2012 7:32 pm Post subject: |
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I downloaded, compiled and installed the 3.3_rc5 git-sources kernel with portage. The problem seems to be fixed in this version.
I will just use this kernel version until the 3.3 gentoo-sources show up.
Thanks for the tip. Should I still report a bug to the alsa devs? I know that Debian, for instance, will be using the 3.2 kernel for their next stable release. Maybe there is a fix that can be backported? |
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epsilon72
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Posts: 568
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epsilon72
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Joined: 20 Sep 2007
Posts: 568
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| Posted: Wed Mar 21, 2012 2:07 am Post subject: |
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| Problem is fixed in linux 3.2.12 patch and linux 3.3 kernel. |
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