(to the admins : if this post is in the wrong section, I apologize…)
Hey gang!
So, I have a USB device (Tascam US 144) that seems to only wotk on USB 1.1, I have installed Manjaro on a Macbook (one of those white ones 
) and would like to “dial-down” USB from 2.0 to 1.1.
Can that be done?
Thanks
Melissa
(happy to learn something again 
)
I just moved the topic from Network to Support. While the query is about a MIDI device (which could go in Sound), you’re specifically asking about USB functionality.
It says it’s a USB 2.0 device here. Every USB port on any computer has been at least 2.0 for almost 25 years. I’m not sure I understand what you’re asking.
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Thank you for moving the post to the right place.
The device seems to only “understand” USB 1.1 (even though there is a USB 2.0 connector and it says "USB 1.1/2.0 ) - I was somehow hoping it could be done, or…I may need to get a hub that handles USB 1.1 only (a…very old one, I guess)…
How do you know that?
By the way, any USB port is backwards compatible with earlier revisions. I don’t see how an ancient 1.1 hub will make any difference.
Either way, maybe find a better device instead of messing around with one that doesn’t work right? Just an idea…
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Hmm, not a bad idea, I was really gravitating towards that idea, anyway…
Eh, I seem to have a paper weight with a USB connection 
Thanks for meditating with me…
Melissa
What did you do to know it doesn’t work? Why do you say it only works with USB 1.1? What is the ouput of lsusb after you plug it? Did you try all your USB ports?
I plugged it in and found it in the list of USB devices (lsusb), QJackctl (or JackD for that matter) cannot display it, so I cannot select/use it. I also used a USB hub to keep the laptop from having to power it, maybe it was under powered, so I wanted to provide power. I further attached an other device and did show up and could be selected/used…it is way newer than the Tascam.
O, by the way, the device is an external USB soundcard, it’s a Tascam U 144. Pretty…old. As @Yochanan mentioned: probably better to use it as a paper weight… 
OK if you don’t want to troubleshoot it.
This is an Audio/MIDI Interface and should be in sound section IMO
Tascam US144 & US122L were released in 2007 and do not use the standard snd-usb-audio driver
Matrix:Module-usb-us122l - AlsaProject
Limitations for the US-144
The US-144 works with kernel 2.6.33 and above, but only when uhci-hcd (USB 1.1) is forced. This can be done by using an USB 1.1 only USB hub or by disabling ehci-hcd (USB 2.0). The US-144 will run as an US-122L, so the digital channels won’t work.
To check the USB drivers and transfer speed:
lsusb -t
To check audio driver snd_usb_us122l is loaded for device
cat /proc/asound/modules
To check ALSA card number and name to configure JACK
cat /proc/asound/cards
Some audio interfaces do not get detected automatically in QJackCtl but ALSA input and output devices can be configured manually
For JACK server, system should have realtime-privileges installed and user should be added to the realtime group
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And…there is sound! With…an other USB device. As @nikgnomic noted, the drivers are not standard. Eh, it was not a big investment…I’ll not starve this month
Lov’ya all…I learned something new:
To research the thing I want to buy…
Good lesson…
Melissa
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