[PD] The dwc_otg.speed=1 issues on RPI with keyboards

Alexandre Torres Porres via Pd-list pd-list at lists.iem.at
Sat Jun 28 21:28:58 CEST 2014

I need an audio in and I got an imic griffin, it says on pd page i need to
make this adjustment, how do I know if I don't really need to do it
anymore? Anyway, if raspbian has changed, maybe we should update the pd
page about it

I dont mind getting a bluetooth keyboard if I have to, I just wonder if any
should work fine or if there are some issues.


2014-06-28 13:21 GMT-03:00 Simon Wise via Pd-list <pd-list at lists.iem.at>:

> On 29/06/14 01:03, Ivica Bukvic via Pd-list wrote:
>> I unfortunately don't have the SD card with the said version of raspbian
>> handy but FWIW I do recall not having to adjust boot parameters in the
>> most
>> recent install and had no problems connecting wired keyboard, mouse, and a
>> monitor without pi crashing.
>  *From:* Pd-list [mailto:pd-list-bounces at mail.iem.at] *On Behalf Of
>>>>>> *Alexandre
>>>>>> Torres Porres via Pd-list
>>>>>> *Sent:* Friday, June 27, 2014 8:28 PM
>>>>>> *To:* pd-lista puredata
>>>>>> *Subject:* [PD] The dwc_otg.speed=1 issues on RPI with keyboards
>>>>>> Hi there, so, about setting the USB to 1.1 speed in RPI with
>>>>>> "dwc_otg.speed=1".
>>>>>> I've only seen a mention about it conflicting with USB and wireless
>>>>>> keyboards on the Pd page (meaning it works only with bluetooth ones),
>>>>>> so I
>>>>>> come here to ask you people a few questions...
>>>>>> I wonder if this could be worked around in future versions of the
>>>>>> raspbian operating system, seems to be some sort of a bug, right?
>>>>>> On that note, hasn't it been already fixed by any chance? Or has
>>>>>> anyone
>>>>>> found a USB or wireless keyboard that eventually works?
> Many sound cards do not require the "dwc_otg.speed=1" setting, get one of
> those. The RPi USB is really quite awful, and many sound cards do things it
> cannot cope with, but the simple ones are mostly fine. I believe it has
> been improved over time, so a recent raspbian would be sensible. I've used
> wireless keyboards or wifi with usb audio on a few occasions, but usually
> try to make all communications via ethernet and custom interfaces via the
> local GPIOs.
> this audio chip has worked well, sounds clean and is cheap ...
> http://www.ebay.com/itm/5V-USB-Powered-PCM2704-MINI-USB-
> Sound-Card-DAC-decoder-board-for-PC-Computer-/171295902514?
> pt=LH_DefaultDomain_0&hash=item27e2080b32
> or
> http://www.ebay.com/itm/PCM2704-USB-DAC-to-S-PDIF-
> Sound-Card-Decoder-Board-3-5mm-Analog-Output-F-PC-/171295895054?pt=LH_
> DefaultDomain_0&hash=item27e207ee0e&_sid=2048038
>  Does it work with any bluetooth keyboard/mouse? I really don't like
>>>>>> those tiny mini small ones, do any of you suggest a nice bigger one?
>>>>>> It
>>>>>> could be a compact one...
> Some Bluetooth keyboards do a very annoying 'sleep' to save battery .. but
> then they don't send the first couple of keystrokes when you start typing
> again, meaning you need to hit shift before starting typing to wake it up.
> Useless when trying to use it for cues etc. No idea how common this design
> is, but I wasted some cash (much more than the audio card!) on mine.
> Simon
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