Two questions: 1. is something known about a usb driver for epson receipt printer m129c?
2. which reasons ar possible for the message "already running port x disabled by hub (EMI?), re-enabling...". Is it always electromagnetic interference? The background of these questions: I managed an epson receipt printer m129c to work with kernel 2.4.20, but there are still some annoying failures which are related to this "EMI?" messsage. I am interested in pathching these problems but I need some advice where to look at and what to do. Therefore I give here just a sketch of the problems I encountered; details can be deliverd as needed: We have 3 IBM Netvista thin clients with kernel 2.4.20. To each thin client is attached via usb: mouse , keyboard, reader for magnetic cards, epson receipt printer m129c and (on 2 boxes only) an hp laser jet 1200. In order to acces the receipt printer, I had to do some nasty trick: I took the printer driver of kernel 2.4.18 and added an entry USB_DEVICE(0x4b8,0x202) to the usb_lp_ids array. (This trick did not work for the printer driver of 2.4.20) This solution works since 7 weeks and I noticed two things: First, the daemon which listens to the magnetic card reader lost its connection to the device sporadically and had to be restarted. (this phenomen can be simulated as follows: pull out the cable of the card reader and plug it in again; the daemon has the correspondign device (ttyUSB0) still open, but does nat receive any input; do restart the daemon, on has to stop the daemon, make a "cat < /dev/ttyUSB0" and then restart it) Second I noticed in th log messages sporadically messages like Feb 20 13:58:08 kasse1 kernel: hub.c: already running port 4 disabled by hub (EMI?), re-enabling... On two systems the corresponding device is the receipt printer, on one system it is the laser printer. The occurrence of these events may be cuased be electromagnetic interference (lights switched on or off). Since two days we have massive problems with one system (which is located in a different room than the other two): This EMI-message occurs more often (now every 5 to 10 minutes) and sometimes the usb system does this reenabling over and over again without pause until the printer is powered off. When the printer is powered again its error led blinks. To convice the printer to work, we found the following annoying procedure: stop printer daemon, printer power off, remove usb-cable, printer power on, plug usb-cable in, kill processes having this device opened (sometimes this power off - on play has to repeated till all processes are killed), make "cat /proc/bus/usb/devices" and then the printer works again. Do you have any idea? Is this really an EMI-problem or is it a problem of the proprietary usb interface of the printer: T: �Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 68 Spd=12 �MxCh= 0 D: �Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= �1 P: �Vendor=04b8 ProdID=0202 Rev= 1.11 S: �Manufacturer=EPSON S: �Product=EPSON UB-U01II/02II S: �SerialNumber=20020402144209440M11J C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= �0mA I: �If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=02 Driver=usblp E: �Ad=01(O) Atr=02(Bulk) MxPS= � 8 Ivl=0ms E: �Ad=82(I) Atr=02(Bulk) MxPS= �64 Ivl=0ms Addendum: Interrogation of the people working in this room brought the foolowing evidence: Since two or three days there is an electric light in this room flickering. After shutting down this light the occurence of this "EMI"- message dropped to a normal level. But there is still the problem that reawakening the printer is a little bit tricky after some communictaion problems occur. Best regards, Ludwig Balke -- Dr.Ludwig Balke Johann-J�rgen-Str. 15 91052 Erlangen Tel. 09131/407 368 Fax. 09131/129 297 ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
