Re: Raspberry Pi 3B USB Printing Issue

On Thu, Mar 10, 2022 at 4:14 AM Hans Petter Selasky <hps@selasky.org> wrote:

> On 3/9/22 18:55, Archimedes Gaviola wrote:
> > Hi,
> >
> > I have an Epson printer connected to one of the USB ports of my RPi 3B.
> The
> > printer is detected as a ugen(4) driver and then I have a text file -
> > myfile3.txt which contains 10 lines of repeating sentences.
> >
> > freebsd@generic:~ % dmesg | grep EPSON
> > ugen1.4: <EPSON EPSON UB-U03II> at usbus1
> >
> > freebsd@generic:~ % cat myfile3.txt
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> > The quick brown fox jumps over the lazy dog.
> >
> > freebsd@generic:~ % cat myfile3.txt  > /dev/usb/1.4.1
> >
> > I print the file successfully through device file redirection with cat
> > command as described above. However, there were times that printing
> seemed
> > to suspend and withhold especially when my RPi 3B system got idle for
> some
> > period of time. Suspended or withhold in such a way that out of the 10
> > lines there were only 2-3 lines to be printed in the paper. So, the only
> > remedy I have for now is to reboot the system to be able to get back to
> > normal printing. I'm using the 14.0-CURRENT #0 main-n253384-45c23c2608e:
> > Thu Feb 24 09:18:58 UTC 2022 and my RPi 4B does not manifest this
> behavior
> > using this same 14.0-CURRENT version. Any idea what's going on?
> >
> > I found these sysctl knobs thinking if some tweaks would help but not
> sure
> > what are the exact settings beyond these defaults.
> >
> > hw.usb.timings.port_resume_delay: 40
> > hw.usb.timings.port_powerup_delay: 300
> > hw.usb.timings.port_reset_recovery: 10
> > hw.usb.timings.port_root_reset_delay: 200
> > hw.usb.timings.port_reset_delay: 50
> >
> > (Resend this message without dmesg and sysctl outputs as files are quite
> > big, sorry I didn't notice it.)
> >
>
> Hi,
>
> Why are you not using /dev/ulpt<N> ?
>
> /dev/usb/1.4.1 is the raw BULK endpoint.
>


Hi Hans,

The ulpt(4) driver isn't detected with this Epson printer. Only my other
printer which is an Xprinter brand is able to get detected with ulpt(4).

Thanks,
Archimedes