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

Simon Wise via Pd-list pd-list at lists.iem.at
Sat Jun 28 18:21:23 CEST 2014

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 ...




>>>>> 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.


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