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x264hack
n00b
Joined: 20 Nov 2007
Posts: 3
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 Posted: Tue Nov 20, 2007 1:19 am Post subject: intel HDA audio noisy on 957XBX (fixed) |
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quick tip for anyone else who has the same problem...
I have an intel 975XBX board rev304 with onboard intel hda audio. loading the alsa snd-hda-intel module, everything works great *except* that loud playback (maybe over30% volume) sounds scratchy or noisy, ie you hear ocasional (really annoying) pops in the audio, sort of like a bad vinyl record. no alsamixer / alsa config / etc settings have any effect on this. also, this seems to be there in any 2.6.xx version of the kernel (gentoo or stock) at least up to 2.6.22 and any version of alsa tried. i eventually tested a lot of the options to the snd-hda-intel module, and it turns out that power_save=0 fixes the problem. no idea why 
in /etc/modules.autoload.d/kernel-2.6, add the following line:
options snd-hda-intel power_save=0
this may affect a number of other boards with the 975 chipset and hda audio, not sure.
enjoy. |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Tue Nov 20, 2007 6:46 am Post subject: |
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| That line should go in /etc/modules.d/alsa |
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Warhead
Tux's lil' helper
Joined: 09 Oct 2003
Posts: 122
Location: Verden, near Bremen, Germany
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| Posted: Tue Dec 11, 2007 1:58 pm Post subject: Re: intel HDA audio noisy on 957XBX (fixed) |
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| x264hack wrote: |
options snd-hda-intel power_save=0
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I can not find this option mentioned in my kernel documentation. adding this to /etc/modules.d/alsa causes this on my system:
| Code: |
lilith ~ # update-modules
* Updating /etc/modprobe.conf by hand ... [ ok ]
* Updating modules.dep ... [ ok ]
lilith ~ # /etc/init.d/alsasound restart
* WARNING: you are stopping a boot service.
* Storing ALSA Mixer Levels ... [ ok ]
* Killing processes using ALSA ... [ ok ]
* Unloading ALSA modules ... [ ok ]
* Loading ALSA modules ...
* Loading: snd-card-0 ...
FATAL: Error inserting snd_hda_intel (/lib/modules/2.6.22-gentoo-r5/alsa-driver/pci/hda/snd-hda-intel.ko): Unknown symbol in module, or unknown parameter (see dmesg) [ !! ]
* Loading: snd-seq-oss ... [ ok ]
* Loading: snd-pcm-oss ... [ ok ]
* ERROR: Failed to load necessary drivers [ ok ]
* Restoring Mixer Levels ...
alsactl: unrecognized option `---'
Usage: alsactl <options> command
Available options:
-h,--help this help
-f,--file # configuration file (default /etc/asound.state or /etc/asound.names) -F,--force try to restore the matching controls as much as possible
-d,--debug debug mode
-v,--version print version of this program
Available commands:
store <card #> save current driver setup for one or each soundcards
to configuration file
restore <card #> load current driver setup for one or each soundcards
from configuration file
names <card #> dump information about all the known present (sub-)devices
into configuration file (DEPRECATED)
* Errors while restoring defaults, ignoring [ ok ]
lilith ~ #
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I checked for a typo several times, i fail to see the mistake.
Regards
Warhead
_________________
To Rome said Nero: "If to smoke you turn
I shall not cease to fiddle while you burn."
To Nero Rome replied: "Pray do your worst,
'Tis my excuse that you were fiddling first."
--Orm Pludge |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Tue Dec 11, 2007 5:42 pm Post subject: Re: intel HDA audio noisy on 957XBX (fixed) |
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Look in /usr/src/linux/Documentation/sound/alsa/ALSA-Configuration.txt
| Code: | Module snd-hda-intel
--------------------
Module for Intel HD Audio (ICH6, ICH6M, ESB2, ICH7, ICH8),
ATI SB450, SB600, RS600,
VIA VT8251/VT8237A,
SIS966, ULI M5461
model - force the model name
position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size)
probe_mask - Bitmask to probe codecs (default = -1, meaning all slots)
single_cmd - Use single immediate commands to communicate with
codecs (for debugging only)
enable_msi - Enable Message Signaled Interrupt (MSI) (default = off)
power_save - Automatic power-saving timtout (in second, 0 =
disable)
power_save_controller - Reset HD-audio controller in power-saving mode
(default = on) |
This is with ALSA 1.0.15
As usual with audio problems, just read wiki article. |
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Warhead
Tux's lil' helper
Joined: 09 Oct 2003
Posts: 122
Location: Verden, near Bremen, Germany
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| Posted: Wed Dec 12, 2007 11:33 am Post subject: Re: intel HDA audio noisy on 957XBX (fixed) |
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| PaulBredbury wrote: | Look in /usr/src/linux/Documentation/sound/alsa/ALSA-Configuration.txt
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That is exactly where I had a look...
| PaulBredbury wrote: |
This is with ALSA 1.0.15
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How can I check, what Version my kernel module is?
Regards
Warhead
[EDIT:] /proc/asound/version tells me, I am using Version 1.0.14. I will upgrade and try again with the latest driver module.
_________________
To Rome said Nero: "If to smoke you turn
I shall not cease to fiddle while you burn."
To Nero Rome replied: "Pray do your worst,
'Tis my excuse that you were fiddling first."
--Orm Pludge |
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