[alsa-devel] Fwd: Support for Roland VG-99 (working code, but could use help)

[Pete Leigh]

Hi Daniel,

On 19 October 2012 18:46, Daniel Mack <zonque at gmail.com> wrote:
> On 19.10.2012 19:02, Pete Leigh wrote:
>> If it's any use regarding the urb 0 -ENOSPACE error I was having,  I
>> can try and track down the config item difference that makes it work,

> If you would point me to any specific
> config option that reproducibly changes the behaviour, that would be of
> great help.

If I take the working config, and disable CONFIG_USB_EHCI_TT_NEWSCHED,
recompile, make install, reboot, then I get the familiar  "cannot
submit urb 0, error -28: not enough bandwidth" error, and trying to
record off the UA-25 in audacity freezes audacity. If I then re-enable
it, recompile, make install, reboot, then I don't see the error, and
recording off the UA-25 works normally in audacity.

This (as I guess you know) is the "Improved Transaction Translator
scheduling" option under "Device Drivers" -> "USB Support" in
menuconfig. The help text even mentions the -28 error, in fact, and
suggests using this option in some circumstances.

Cheers,

- Pete