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Re: Scratchy sound with debian wheezy on ASUS A73B series

I have been getting this on various machines (FX890 Chipsets(AMD),
Sandybridge Machines - others) with all recent kernels from around 3.1
onwards. There must have been a commit affecting the snd_hda_intel
driver as this is the commonality between them.

Trying to bisect what comit  will be difficult. There are several
module params to try and it appears to be something to do with buffers
as the issue only seems to crop up at the start of audio streams. I.e
if I fast forward/play another stream etc then it seems to right

There are several module parms you can try to resolve the issue if
this is the same:

parm:           index:Index value for Intel HD audio interface. (array of int)
parm:           id:ID string for Intel HD audio interface. (array of charp)
parm:           enable:Enable Intel HD audio interface. (array of bool)
parm:           model:Use the given board model. (array of charp)
parm:           position_fix:DMA pointer read method.(-1 = system
default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO).
(array of int)
parm:           bdl_pos_adj:BDL position adjustment offset. (array of int)
parm:           probe_mask:Bitmask to probe codecs (default = -1).
(array of int)
parm:           probe_only:Only probing and no codec initialization.
(array of int)
parm:           jackpoll_ms:Ms between polling for jack events
(default = 0, using unsol events only) (array of int)
parm:           single_cmd:Use single command to communicate with
codecs (for debugging only). (bool)
parm:           enable_msi:Enable Message Signaled Interrupt (MSI) (bint)
parm:           power_save:Automatic power-saving timeout (in second,
0 = disable). (xint)
parm:           power_save_controller:Reset controller in power save
mode. (bool)
parm:           align_buffer_size:Force buffer and period sizes to be
multiple of 128 bytes. (bint)
parm:           snoop:Enable/disable snooping (bool)

On 2 April 2013 10:11, Ximo <ximolistas@yahoo.es> wrote:
> On 04/01/2013 01:15 AM, Vincent Hobeïka wrote:
>> Dear debian users,
>> I have recently set up a debian wheezy on an ASUS A73B series.
>> Everything went well except that the sound is very scratchy. I can
>> play sound but there is an additional annoying noise, like a bad
>> communication on old land lines: scrrrtch scrrrtch. The higher the
>> volume, the higher the frequency of the scratches (and volume too). It
>> sounds a bit like a saturated amplifier, but not exactly. It's more
>> like a bad contact which would always work badly. There is a dual boot
>> on the computer and the sound is working perfectly well on another non
>> free operating system. So I suppose that the hardware is ok.
>> I have checked the volumes and they are not at the max. I have tried
>> to play with alsa settings without any improvement.
>> I tried adding a PCM channel in order to reduce this effect (see
>> .asoundrc below). I can change the volume with three channels: master,
>> PCM, speaker.
>> I have tried removing pulseaudio, alsa-base, reinstalling them one by
>> one... I finally installed paman and pavucontrol and played with them,
>> but nothing worked.
>> Any help or hint would be very welcome. Here is my setup:
>> $ aplay -l
>> **** Liste des Périphériques Matériels PLAYBACK ****
>> carte 0: SB [HDA ATI SB], périphérique 0: ALC269VB Analog [ALC269VB
>> Analog]
>>    Sous-périphériques: 1/1
>>    Sous-périphérique #0: subdevice #0
>> carte 1: Generic [HD-Audio Generic], périphérique 3: HDMI 0 [HDMI 0]
>>    Sous-périphériques: 1/1
>>    Sous-périphérique #0: subdevice #0
>> $ aplay -L
>> http://paste.debian.net/246281/
>> $ cat .asoundrc
>> pcm.!default front:SB
>> $ cat /proc/asound/card*/codec#0 | grep -i codec
>> Codec: Realtek ALC269VB
>> Codec: ATI R6xx HDMI
>> $ cat /proc/asound/modules
>>   0 snd_hda_intel
>>   1 snd_hda_intel
>> $ lspci -nn |grep Audio
>> 00:14.2 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI
>> SBx00 Azalia (Intel HDA) [1002:4383] (rev 40)
>> 01:00.1 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI
>> Caicos HDMI Audio [Radeon HD 6400 Series] [1002:aa98]
>> $ lsmod | grep snd
>> http://paste.debian.net/246284/
>> $ cat /etc/modprobe.d/alsa-base.conf
>> http://paste.debian.net/246285/
>> $ aptitude search "~dsound ~i"
>> http://paste.debian.net/246286/
>> $ cat /etc/apt/sources.list
>> deb http://ftp.fr.debian.org/debian/ wheezy main contrib non-free
>> deb-src http://ftp.fr.debian.org/debian/ wheezy main
>> deb http://security.debian.org/ wheezy/updates main contrib
>> deb-src http://security.debian.org/ wheezy/updates main contrib
>> I am completely lost. Can anyone give me some hints regarding this please?
>> Best regards,
> Hello,
> If the BIOS have the parameter "PCI latency timer" try increasing it.
> More info
> <http://www.ibm.com/developerworks/linux/library/l-hw2/index.html>.
> Best regards,
> --
> ximolistas@yahoo.es
> --
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