ehci-hcd and the tascam 122l

Wed Feb 8 17:14:49 UTC 2012

Hi, I am having problems with the tascam 122l soundcard only connecting
intermittently.  I have always had this problem with ubuntu studio, but
only sometimes can get it working.  I'd be grateful for any help that you
can give me.

I have set all of the options correctly
syslog is reporting that there is 'set sample rate error' when I insert the
usb card and that there is an invalid bulk endpoint error:

Feb  8 16:58:27 XSubuntu11 kernel: [ 1595.224049] usb 1-3: new high speed
USB device number 9 using ehci_hcd
Feb  8 16:58:27 XSubuntu11 mtp-probe: checking bus 1, device 9:
"/sys/devices/pci0000:00/0000:00:10.4/usb1/1-3"
Feb  8 16:58:27 XSubuntu11 kernel: [ 1595.356518] usb 1-3: config 1
interface 1 altsetting 1 bulk endpoint 0x83 has invalid maxpacket 9
Feb  8 16:58:27 XSubuntu11 kernel: [ 1595.367823] 9: cannot set freq 44100
to ep 0x81
Feb  8 16:58:28 XSubuntu11 kernel: [ 1595.768033] us122l_set_sample_rate
error
Feb  8 16:58:28 XSubuntu11 kernel: [ 1595.768065] snd-usb-us122l: probe of
1-3:1.1 failed with error -22
Feb  8 16:58:28 XSubuntu11 kernel: [ 1595.768132] usb 1-3: USB disconnect,
device number 9
Feb  8 16:58:28 XSubuntu11 kernel: [ 1596.008042] usb 1-3: new high speed
USB device number 10 using ehci_hcd
Feb  8 16:58:28 XSubuntu11 kernel: [ 1596.140582] usb 1-3: config 1
interface 1 altsetting 1 bulk endpoint 0x83 has invalid maxpacket 9
Feb  8 16:58:30 XSubuntu11 kernel: [ 1598.140064] 10: cannot set freq 44100
to ep 0x81
Feb  8 16:58:30 XSubuntu11 mtp-probe: bus: 1, device: 9 was not an MTP
device
Feb  8 16:58:30 XSubuntu11 kernel: [ 1598.544040] us122l_set_sample_rate
error
Feb  8 16:58:30 XSubuntu11 kernel: [ 1598.544073] snd-usb-us122l: probe of
1-3:1.1 failed with error -22
Feb  8 16:58:30 XSubuntu11 mtp-probe: checking bus 1, device 10:
"/sys/devices/pci0000:00/0000:00:10.4/usb1/1-3"
Feb  8 16:58:30 XSubuntu11 mtp-probe: bus: 1, device: 10 was not an MTP
device

I have tried everything that I can think of in order to get it to work
and I have set all the options according to the alsa page (
http://www.alsa-project.org/main/index.php/Matrix:Module-usb-us122l) and
have read about the patch at (http://wiki.briata.org/doku.php) but this is
apparently included in the kernel now.  I have recently used the
alsa-upgrade script to update the alsa version to the latest release.  Alsa
is working fine still but I am still getting the same problem.  I seem to
remember that when I did a clean install from the distro iso, I didn't get
the problem as regularly.  I have also noticed that in the kernel
configuration, the ehci-hcd module is set as compiled into the kernel but I
cannot modprobe for it as it is reported as not existing.  I am afraid that
I do not know whether this is because it is compiled into the kernel or
whether it should actually have a module available.

some info:

I have 3.0.0-15-generic running on a laptop (belinea - out of business, but
runs ok)

james at XSubuntu11:~$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 010: ID 0644:800e TEAC Corp. TASCAM US-122L
Bus 001 Device 004: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573
Wireless Adapter
Bus 001 Device 005: ID 05e3:0503 Genesys Logic, Inc. Webcam
Bus 003 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth
Dongle (HCI mode)
james at XSubuntu11:~$ cat /proc/asound/cards
 0 [VT82xx         ]: HDA-Intel - HDA VIA VT82xx
                      HDA VIA VT82xx at 0xcb000000 irq 17

Is there any news on a stable 11.10 low latency kernel?
Also, is there a feature request place (perhaps here) - I came across
tuxonice today and was wondering if it would be possible to request its
inclusion into the kernel.   I don't want to attempt to patch the kernel
myself, although I may try.

Also, is there a way of helping at all with the development.  I am a
reasonably experienced amateur developer in a number of oop and scripting
languages although my experience with kernel development is absolutely
minimal (I still haven't attempted my own kernel compiling or patching (at
least not successfully!).  I am also an experienced musician and a
competent web developer /designer.

Finally, thanks for ubuntu studio.  The XFCE wm is great on resources, and
laditray and gladish are a godsend.

James

-- 
James Stewart Miller Bsc(hons) Psych.
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