Hello Alan,
Ok... I've uploaded the DEBUG enabled 3.5.2 kernel logs as requested and
I'm working on getting the USB snooping going on the old Athlon 1.1Ghz
Windows XP machine (yuk!).
http://www.trinityos.com/SCRATCH/
Regardless of getting this possible high-speed hack working, could you
explain a bit by what you meant by:
"The problem is caused by the ehci-hcd driver's not-so-great support
for scheduling periodic transfers to full-speed devices. That's why the
HP and Dell systems have no trouble but your Gateway laptop can't handle
it. "
To me if I'm doing the math right, 2 (two stereo channels) * 24 (bit) *
96,000 (sampling) == 4.6Mb/s which is only a third of the USB port's
speed when even running in FULL speed mode! Why would it be complaining
when there isn't anything else on this bus? What are the chances
when/if this EHCI driver will get some fixes for this issue?
Btw, this might be helpful but the "quisk" program I'm using has a
portaudio (not PulseAudio) script to show devices and their abilities.
The onboard soundcard works all the way up to 192Khz but it's horribly
noisy and ironically, it's lowpass/highpass filtering seems to only
support ~70Khz worth of bandwidth though the chip can do far better!
Lame. Guess that's what one gets for a $400 laptop these days.
$ python portaudio.py
ALSA lib pcm.c:2209:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2209:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2209:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
Open 0
Version 1899
Version Text PortAudio V19-devel (built Jan 17 2012 04:03:50)
NumDev 12
Device 0, host api ALSA
Name HDA Intel PCH: ALC269VB Analog (hw:0,0)
Max inputs 2, Max outputs 2
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 1, host api ALSA
Name HDA Intel PCH: HDMI 0 (hw:0,3)
Max inputs 0, Max outputs 8
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 2, host api ALSA
Name SB X-Fi Surround 5.1 Pro: USB Audio (hw:1,0)
Max inputs 2, Max outputs 6
Speeds for 2-channel paInt32: 48000 96000
Device 3, host api ALSA
Name SB X-Fi Surround 5.1 Pro: USB Audio #1 (hw:1,1)
Max inputs 0, Max outputs 2
Speeds for 2-channel paInt32: 44100 48000
Device 4, host api ALSA
Name front
Max inputs 0, Max outputs 2
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 5, host api ALSA
Name surround40
Max inputs 0, Max outputs 2
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 6, host api ALSA
Name surround51
Max inputs 0, Max outputs 2
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 7, host api ALSA
Name surround71
Max inputs 0, Max outputs 2
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 8, host api ALSA
Name hdmi
Max inputs 0, Max outputs 8
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 9, host api ALSA
Name pulse
Max inputs 32, Max outputs 32
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Device 10, host api ALSA
Name dmix
Max inputs 0, Max outputs 2
.... lots of the following:
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave
Expression 'ret' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 1669
Expression 'AlsaOpen( hostApi, parameters, streamDir, &pcm )' failed in
'src/hostapi/alsa/pa_linux_alsa.c', line: 1701
... and then
Speeds for 2-channel paInt32:
Device 11, host api ALSA
Name default
Max inputs 32, Max outputs 32
Speeds for 2-channel paInt32: 44100 48000 96000 192000
Close 0
--David
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