[LAU] ALSA ate my MIDI! (Or Something) - RESOLVED

[david]

Folderol wrote:
> On Mon, 22 Sep 2008 13:07:07 +0930
> Matthew Smith <matt at smiffytech.com> wrote:
> 
>> Quoth Matthew Smith at 2008-09-22 11:07...
>>> ALSA is not getting inbound data from the device although it can send
>>> OK.  The keyboard works as it should under Windows, so I can only guess
>>> that there is something wrong with ALSA - either a mis-configuration or
>>> a bug - but I don't even know where to start looking.
>> Want to know what was stopping it working?  Do you?
>>
>> USB hub.  Yep, a nasty little bit of $10 hardware.
>>
>> The keyboard was connected through a USB hub.  When I traced through the 
>> wiring, found this and plugged directly into the computer, it all 
>> started working.
>>
>> Any USB gurus like to tell us why that was?
>>
>> Cheers
>>
>> M
> 
> At a guess - some USB hubs only work at USB 1 (or so I've read)

Also, some USB hubs may not provide the full spec of power to every port 
on the hub if you happen to be using all of them. I'm using 5 of the 6 
available ports on my little powered Zonet USB2 hub (with transfer rate 
to prove it!) but if I add my 2.5" external notebook hard drive to the 
last available port, the drive doesn't get enough juice to power up and 
make a connection. Directly connected to the computer, it works fine.

If it's really a USB1 hub, it may not be providing enough power for 
everything connected to the hub when you plugged your keyboard into?

-- 
David
gnome at hawaii.rr.com
authenticity, honesty, community