USB quattro input quality

USB quattro input quality

[Patrick Shirkey]

Just wondering if anyone has found time to look into fixing the input 
quality of the usb quattro?

I'm not sure it has ever functioned perfectly for input quality.

Currently I get a better sound quality from my $10 cmipci than my $400 
usb-quattro ;-P

There is a constant crackle in the audio stream.

This has been independantly verified by numerous users over the past few 
months.

-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
Http://www.nana7.net - Bar Nana - Itaewon, Seoul, Sth Corea
========================================


Apparently upon the beginning of the barrage, the donkey broke 
discipline and panicked, toppling the cart. At that point, the rockets 
disconnected from the timer, leaving them strewn around the street. 
Tethered to the now toppled cart, the donkey was unable to escape before 
the arrival of U.S. troops.

United Press International
Rockets on donkeys hit major Baghdad sites

By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM



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Re: USB quattro input quality

[Tim Blechmann]

> Just wondering if anyone has found time to look into fixing the input 
> quality of the usb quattro?
> 
> I'm not sure it has ever functioned perfectly for input quality.
> 
> Currently I get a better sound quality from my $10 cmipci than my $400
> 
> usb-quattro ;-P
> 
> There is a constant crackle in the audio stream.
there is a thread on this on the alsa bugtracking system ... there is a
patch available, but it's not fully working for me...
using kernel 2.6.6rc2 with the patch to the usb subsystem to allow the
using of the quattro, i'll only have to restart alsa about once or
twice. (probably i still had problems with the alsa patch because of
kernel 2.6.6)

cheers...

 Tim                          mailto:TimBlechmann@gmx.de
                              ICQ: 96771783
--
The only people for me are the mad ones, the ones who are mad to live,
mad to talk, mad to be saved, desirous of everything at the same time,
the ones who never yawn or say a commonplace thing, but burn, burn,
burn, like fabulous yellow roman candles exploding like spiders across
the stars and in the middle you see the blue centerlight pop and
everybody goes "Awww!"
                                                          Jack Kerouac



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Re: USB quattro input quality

[Patrick Shirkey]

Tim Blechmann wrote:
>>Just wondering if anyone has found time to look into fixing the input 
>>quality of the usb quattro?
>>
>>I'm not sure it has ever functioned perfectly for input quality.
>>
>>Currently I get a better sound quality from my $10 cmipci than my $400
>>
>>usb-quattro ;-P
>>
>>There is a constant crackle in the audio stream.
> 
> there is a thread on this on the alsa bugtracking system ... there is a
> patch available, but it's not fully working for me...
> using kernel 2.6.6rc2 with the patch to the usb subsystem to allow the
> using of the quattro, i'll only have to restart alsa about once or
> twice. (probably i still had problems with the alsa patch because of
> kernel 2.6.6)
> 


Thanks for the tip.

Just to confirm what I read in mantis. The quattro can only record in 
big endian mode and playback in little endian?

How does this affect jackd?

AFAIK it's not possible to have dual modes while using jack...


-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
Http://www.nana7.net - Bar Nana - Itaewon, Seoul, Sth Corea
========================================


Apparently upon the beginning of the barrage, the donkey broke 
discipline and panicked, toppling the cart. At that point, the rockets 
disconnected from the timer, leaving them strewn around the street. 
Tethered to the now toppled cart, the donkey was unable to escape before 
the arrival of U.S. troops.

United Press International
Rockets on donkeys hit major Baghdad sites

By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM



-------------------------------------------------------
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Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver
higher performing products faster, at low TCO.
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USB audio kernel panic

[Patrick Shirkey]

Using the latest usb-audio code from cvs I get a kernel panic when 
loading the drivers. After that I cannot unload the modules and have to 
reboot if I want to try again.

This doesn't happen with the hdsp driver or cmipci driver which I also use.

I'm running kernel-2.2.21 with gcc-2.95.4

-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
Http://www.nana7.net - Bar Nana - Itaewon, Seoul, Sth Corea
========================================


Apparently upon the beginning of the barrage, the donkey broke 
discipline and panicked, toppling the cart. At that point, the rockets 
disconnected from the timer, leaving them strewn around the street. 
Tethered to the now toppled cart, the donkey was unable to escape before 
the arrival of U.S. troops.

United Press International
Rockets on donkeys hit major Baghdad sites

By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM



-------------------------------------------------------
This SF.Net email is sponsored by Sleepycat Software
Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver
higher performing products faster, at low TCO.
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Re: USB audio kernel panic

[Clemens Ladisch]

Patrick Shirkey wrote:
> Using the latest usb-audio code from cvs I get a kernel panic when
> loading the drivers.
>
> I'm running kernel-2.2.21 with gcc-2.95.4

Works fine with my 2.2.19(?).

ALSA 1.0.4 fixed some horrible bugs in the USB compatibility code for
2.2.x kernels.

Where exactly does this crash happen?


Regards,
Clemens




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Re: USB audio kernel panic

[Patrick Shirkey]

Clemens Ladisch wrote:
> Patrick Shirkey wrote:
> 
>>Using the latest usb-audio code from cvs I get a kernel panic when
>>loading the drivers.
>>
>>I'm running kernel-2.2.21 with gcc-2.95.4
> 
> 
> Works fine with my 2.2.19(?).
> 
> ALSA 1.0.4 fixed some horrible bugs in the USB compatibility code for
> 2.2.x kernels.
> 
> Where exactly does this crash happen?
> 

I just updated to the latest sf.net cvs. hdspmixer is working again but 
still get a kernel error with usb-audio.

This is the error message and the corresponding section of /proc/ksyms. 
(The actual symbol doesn't appear)

-----------

Unable to handle kernel paging request at virtual address 28302e63
  printing eip:
e08eafc0
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<e08eafc0>]    Tainted: PF



.
.
.

e08e7000 
__insmod_snd-usb-audio_O/lib/modules/2.4.21/kernel/sound/usb/snd-usb-au
dio.o_M40A2C2B5_V132117 [snd-usb-audio]
e08e7060 __insmod_snd-usb-audio_S.text_L29104   [snd-usb-audio]
e08eb02c snd_hack_usb_set_interface     [snd-usb-audio]
e08ed8a8 snd_usbmidi_disconnect [snd-usb-audio]
e08edff4 snd_usb_create_midi_interface  [snd-usb-audio]
e08ee220 __insmod_snd-usb-audio_S.rodata_L7690  [snd-usb-audio]
e08f01e0 __insmod_snd-usb-audio_S.data_L4548    [snd-usb-audio]
e08f13c0 __insmod_snd-usb-audio_S.bss_L64       [snd-usb-audio]
(END)


----------------
-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
Http://www.nana7.net - Bar Nana - Itaewon, Seoul, Sth Corea
========================================


Apparently upon the beginning of the barrage, the donkey broke 
discipline and panicked, toppling the cart. At that point, the rockets 
disconnected from the timer, leaving them strewn around the street. 
Tethered to the now toppled cart, the donkey was unable to escape before 
the arrival of U.S. troops.

United Press International
Rockets on donkeys hit major Baghdad sites

By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM



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Re: USB audio kernel panic

[Clemens Ladisch]

Patrick Shirkey wrote:
> >>Using the latest usb-audio code from cvs I get a kernel panic when
> >>loading the drivers.
> >>
> >>I'm running kernel-2.2.21 with gcc-2.95.4
>
> Unable to handle kernel paging request at virtual address 28302e63
> EIP:    0010:[<e08eafc0>]    Tainted: PF
>
> e08e7060 __insmod_snd-usb-audio_S.text_L29104   [snd-usb-audio]
> e08eb02c snd_hack_usb_set_interface     [snd-usb-audio]

The 2.6.5-rc2 kernel introduced some API changes to work around
devices with broken descriptors.  The resulting changes in the ALSA
code broke ALSA's workaround for the same problem.

The fix below is now in CVS.


HTH
Clemens
-- 

Index: usbaudio.inc1
===================================================================
RCS file: /cvsroot/alsa/alsa-driver/usb/usbaudio.inc1,v
retrieving revision 1.5
diff -u -r1.5 usbaudio.inc1
--- alsa-driver/usb/usbaudio.inc1	23 Mar 2004 12:48:18 -0000	1.5
+++ alsa-driver/usb/usbaudio.inc1	21 May 2004 07:34:10 -0000
@@ -98,7 +98,7 @@
 				   interface, NULL, 0, HZ * 5)) < 0)
 		return ret;

-	iface->act_altsetting = alternate;
+	iface->act_altsetting = i;
 	for (i = 0; i < iface_as->bNumEndpoints; i++) {
 		u8 ep = iface_as->endpoint[i].bEndpointAddress;
 		usb_settoggle(dev, ep&USB_ENDPOINT_NUMBER_MASK, usb_endpoint_out(ep), 0);




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Re: USB audio kernel panic

[Patrick Shirkey]

Clemens Ladisch wrote:
> Patrick Shirkey wrote:
> 
>>>>Using the latest usb-audio code from cvs I get a kernel panic when
>>>>loading the drivers.
>>>>
>>>>I'm running kernel-2.2.21 with gcc-2.95.4
>>>
>>Unable to handle kernel paging request at virtual address 28302e63
>>EIP:    0010:[<e08eafc0>]    Tainted: PF
>>
>>e08e7060 __insmod_snd-usb-audio_S.text_L29104   [snd-usb-audio]
>>e08eb02c snd_hack_usb_set_interface     [snd-usb-audio]
> 
> 
> The 2.6.5-rc2 kernel introduced some API changes to work around
> devices with broken descriptors.  The resulting changes in the ALSA
> code broke ALSA's workaround for the same problem.
> 
> The fix below is now in CVS.
>

Tested and working.

Thanks.

-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
Http://www.djcj.org/gigs/ - Gigs guide Korea
Http://www.nana7.net - Bar Nana - Itaewon, Seoul, Sth Corea
========================================


Apparently upon the beginning of the barrage, the donkey broke 
discipline and panicked, toppling the cart. At that point, the rockets 
disconnected from the timer, leaving them strewn around the street. 
Tethered to the now toppled cart, the donkey was unable to escape before 
the arrival of U.S. troops.

United Press International
Rockets on donkeys hit major Baghdad sites

By P. MITCHELL PROTHERO
Published 11/21/2003 11:13 AM



-------------------------------------------------------
This SF.Net email is sponsored by: Oracle 10g
Get certified on the hottest thing ever to hit the market... Oracle 10g. 
Take an Oracle 10g class now, and we'll give you the exam FREE.
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Re: USB quattro input quality

[James Courtier-Dutton]

Patrick Shirkey wrote:
> Tim Blechmann wrote:
> 
>>> Just wondering if anyone has found time to look into fixing the input 
>>> quality of the usb quattro?
>>>
>>> I'm not sure it has ever functioned perfectly for input quality.
>>>
>>> Currently I get a better sound quality from my $10 cmipci than my $400
>>>
>>> usb-quattro ;-P
>>>
>>> There is a constant crackle in the audio stream.
>>
>>
>> there is a thread on this on the alsa bugtracking system ... there is a
>> patch available, but it's not fully working for me...
>> using kernel 2.6.6rc2 with the patch to the usb subsystem to allow the
>> using of the quattro, i'll only have to restart alsa about once or
>> twice. (probably i still had problems with the alsa patch because of
>> kernel 2.6.6)
>>
> 
> 
> Thanks for the tip.
> 
> Just to confirm what I read in mantis. The quattro can only record in 
> big endian mode and playback in little endian?
> 
> How does this affect jackd?
> 
> AFAIK it's not possible to have dual modes while using jack...
> 
> 

kernel 2.6.6rc2 is very broken with respect to USB. Use 2.6.6rc3 or above.




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