Re: Raspberry Pi 3B USB Printing Issue
- Reply: Hans Petter Selasky : "Re: Raspberry Pi 3B USB Printing Issue"
- In reply to: Hans Petter Selasky : "Re: Raspberry Pi 3B USB Printing Issue"
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Date: Fri, 11 Mar 2022 15:36:43 UTC
On Thu, Mar 10, 2022 at 8:53 PM Hans Petter Selasky <hps@selasky.org> wrote: > On 3/10/22 13:37, Archimedes Gaviola wrote: > > On Thu, Mar 10, 2022 at 3:47 PM Hans Petter Selasky <hps@selasky.org> > wrote: > > > >> On 3/10/22 00:24, Archimedes Gaviola wrote: > >>> 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). > >>> > >> > >> Hi, > >> > >> Is it correctly detected if you the VID and PID to > >> /usr/src/sys/dev/usb/serial/ulpt.c ? > >> > > > > Hi Hans, > > > > Not sure how to make the current ugen(4) driver into ulpt(4). Is there a > > need to disable ugen(4) and recompile the kernel and let ulpt(4) driver > > loaded and enabled? As far as vendor ID and product ID of this Epson > > printer are concerned, these are 0x04b8 and 0x0200 respectively. I > > checked it with usbconfig below. I checked also > > /usr/src/sys/dev/usb/usbdevs file and it seems only the vendor ID is > > present but no product ID on these particular model which is TM-U220B. > > > > root@generic:~ # usbconfig -u 1 -a 4 dump_device_desc > > ugen1.4: <EPSON EPSON UB-U03II> at usbus1, cfg=0 md=HOST spd=FULL > (12Mbps) > > pwr=ON (10mA) > > > > bLength = 0x0012 > > bDescriptorType = 0x0001 > > bcdUSB = 0x0110 > > bDeviceClass = 0x0000 <Probed by interface class> > > bDeviceSubClass = 0x0000 > > bDeviceProtocol = 0x0000 > > bMaxPacketSize0 = 0x0008 > > idVendor = 0x04b8 > > idProduct = 0x0202 > > bcdDevice = 0x0200 > > iManufacturer = 0x0001 <EPSON> > > iProduct = 0x0002 <EPSON UB-U03II> > > iSerialNumber = 0x0003 <20160118193053218M03C> > > bNumConfigurations = 0x0001 > > > > > >> > >> When you use the printer via the BULK endpoint, there might be a missing > >> flush packet, to flush all the printed text. This happens when the > >> payload length is a multiple of the wMaxPacketSize. > >> > > > > Okay this is noted but what I found lately in usbdump are the presence of > > ioerrors ERR=IOERROR in capturing the ugen1.4.1 device while printing > were > > the printed outputs are intermittent. This time I'm going to use the word > > "intermittent" as I don't have any idea when this occurs. It just behaves > > anytime without any warnings or notices to the system not even logs in > the > > dmesg. On the other hand, normal printing will prompts with ERR=0 with > > complete outputs. > > > > root@generic:~ # usbdump -d ugen1.4.1 -v > > 19:14:11.861532 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:14:12.147498 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:14:23.491555 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:14:23.777222 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:14:32.325817 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:14:32.612222 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:18:46.334624 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:18:46.620474 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:18:53.975846 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:18:54.262223 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:21:38.505907 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:21:38.792224 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:22:06.235833 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:22:06.521723 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:22:16.344551 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:22:16.630472 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:22:31.625887 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:22:31.911723 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:22:40.325843 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:22:40.612223 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:23:53.484761 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:23:53.514428 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0, > > frame[0] WRITE 128 bytes > > 19:23:57.055902 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:23:57.084227 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:00.244450 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:00.274206 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:03.974541 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:04.004203 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 144 bytes > > 19:24:06.975851 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:07.004209 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:09.605790 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:09.633980 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:12.385923 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:12.413760 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:15.224542 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:15.253771 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:18.174530 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:18.203756 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:21.125927 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:21.153752 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 136 bytes > > 19:24:24.275854 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:24.303756 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 144 bytes > > 19:24:27.485857 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:27.772223 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:24:36.194633 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:36.223750 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:39.115831 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:39.143771 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 144 bytes > > 19:24:41.855851 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:41.883758 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:44.215882 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:44.243755 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:47.634603 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:47.663751 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:50.324493 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:50.353755 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:52.864637 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:52.893756 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 144 bytes > > 19:24:54.944528 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:54.973743 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:24:57.254498 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:24:57.537227 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=0 > > frame[0] WRITE 1264 bytes > > 19:25:06.024607 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:06.053747 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:08.214550 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:08.243749 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 144 bytes > > 19:25:10.355858 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:10.383752 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:12.435851 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:12.463752 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:14.574555 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:14.603740 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:17.814561 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:17.844015 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:19.924529 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:19.954029 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:28.075867 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:28.104036 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 144 bytes > > 19:25:30.195823 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:30.224035 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:32.574567 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:32.604028 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:34.624522 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:34.654016 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 128 bytes > > 19:25:36.895889 usbus1.4 > > SUBM-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=1264,IVAL=0 > > frame[0] WRITE 1264 bytes > > 19:25:36.924007 usbus1.4 > > DONE-BULK-EP=00000001,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=IOERROR > > frame[0] WRITE 144 bytes > > > > 86 packets captured > > 41546 packets received by filter > > 0 packets dropped by kernel > > > > What could be these ioerrors? As I am also firm that my Epson printer's > > status is good and this only happens in RPi 3B but not RPi 4B. My RPi 4B > > using the same printer and ugen(4) driver is very stable. > > Hi, > > IOERROR usually means an electrical error. The RPI3B will use a > transaction translator for the FULL speed traffic, which is driven by > software. Maybe there is a bug in the HC driver, > "dev/usb/controller/dwc_otg.c". There are some sysctls to enable full HC > debugging, see hw.usb.xxx.debug=17 . > > Is the device self-powered? > > Try something like this: > > > diff --git a/sys/dev/usb/serial/ulpt.c b/sys/dev/usb/serial/ulpt.c > > index c566da92437..d663800f4fc 100644 > > --- a/sys/dev/usb/serial/ulpt.c > > +++ b/sys/dev/usb/serial/ulpt.c > > @@ -499,6 +499,9 @@ static const STRUCT_USB_HOST_ID ulpt_devs[] = { > > {USB_IFACE_CLASS(UICLASS_PRINTER), > > USB_IFACE_SUBCLASS(UISUBCLASS_PRINTER), > > USB_IFACE_PROTOCOL(UIPROTO_PRINTER_1284)}, > > + > > + /* Epson printer */ > > + {USB_VPI(USB_VENDOR_EPSON, USB_PRODUCT_EPSON_TMU220B, 0)}, > > }; > > > > static int > > diff --git a/sys/dev/usb/usbdevs b/sys/dev/usb/usbdevs > > index 01c25d7c096..632b8f19610 100644 > > --- a/sys/dev/usb/usbdevs > > +++ b/sys/dev/usb/usbdevs > > @@ -1941,6 +1941,7 @@ product EPSON 1270 0x0120 > Perfection 1270 scanner > > product EPSON 2480 0x0121 Perfection 2480 scanner > > product EPSON 3590 0x0122 Perfection 3590 scanner > > product EPSON 4990 0x012a Perfection 4990 Photo scanner > > +product EPSON TMU220B 0x0200 TM-U220B > > product EPSON CRESSI_EDY 0x0521 Cressi Edy diving computer > > product EPSON N2ITION3 0x0522 Zeagle N2iTion3 diving computer > > product EPSON STYLUS_875DC 0x0601 Stylus Photo 875DC Card Reader > > Hi Hans, The patch above has no effect. My Epson printer is still obtaining the ugen(4) driver after I apply and recompile the kernel. Anything I've missed? Thanks, Archimedes